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STRUCTURE OF ATOM -4

2

TEST SYLLABUS : STRUCTURE OF ATOM
Your Target is to secure Good Rank in NEET - 2020

Important Instructions:

(1) There is only one correct option.

(2) Duration of Test is 1 Hour and Questions Paper Contains 45 Questions. The Max. Marks are 180.
(3) Each correct answer carries 4 marks, while 1 mark will be deducted for every wrong answer. Guessing of answer reduces your effort.

1 / 45

For which element, the valence electron will be present in the highest energy orbital.

2 / 45

An electron, e1 is moving in the fifth stationary state, and another electron e2 is moving in the fourth stationary state.
The radius of orbit of electron, e1 is five times the radius of orbit of electron, e2 calculate the ratio of velocity of electron e1 (v1) to the velocity of electron e2 (v2).

3 / 45

Bohr radius of nth orbit of an atom is given by the expression:

4 / 45

Which of the following suggested de Broglie wavelengths is not possible for the electron in a Bohr orbit of hydrogen atom?

5 / 45

Assertion : All isotopes of a given element show the same type of chemical behaviour.
Reason : The chemical properties of an atom are controlled by the number of electrons in the atom.

6 / 45

The ratio between kinetic energy and the total energy of the electrons of hydrogen atom according to Bohr’s model is

7 / 45

Which of the following levels of H and He+ have same energy respectively ?
(A) 1, 2 (B) 3, 4
(C) 2, 4 (D) 3, 6

8 / 45

Match the columns.

 

9 / 45

Match the columns.

10 / 45

The five d-orbitals are designated as dxy , dyd , dxz , dx2-y2  and dz2 Choose the correct statement.

11 / 45

The electronic configuration of Cu (atomic number 29) is

12 / 45

Assertion : The radius of the first orbit of hydrogen atom is 0.529Å.
Reason : Radius of each circular orbit (rn) - 0.529Å (n2/Z), where n = 1, 2, 3 and Z = atomic number.

13 / 45

According to Bohr’s theory the energy required for an electron in the Li2+ ion to be emitted from n = 2 state is (given that the ground state ionization energy of hydrogen atom is
13.6 eV)

14 / 45

Maximum number of electrons in a subshell of an atom is determined by the following:

15 / 45

On the basis of figure given below which of the following tatement(s) is/are correct ?

(i) At point B, when only electric field is applied.
(ii) At point C, when both electric and magnetic field is applied.
(iii) At point B, when both electric and magnetic fields are balanced.
(iv) At point C, when only magnetic field is applied.
Which of the following is/are correct?

16 / 45

Match the columns.

17 / 45

A 600 W mercury lamp emits monochromatic rediation of wavelength 331.3 nm. How many photons are emitted from the lamp per second ? (h = 6.626 × 10-34 Js; velocity of light= 3 × 108 ms-1)

18 / 45

Which of the following statements of quantum mechanics was in agreement with Bohr’s model?
(i) The path of an electron in an atom can never be determined accurately.
(ii) The energy of electrons in atom is quantized i.e., can only have specific values.
(iii) An orbital cannot contain more than two electrons.

19 / 45

Match the columns.

20 / 45

The number of electrons, neutrons and protons in a species are equal to 10, 8 and 8 respectively. The proper symbol of the species is

21 / 45

Assertion : It is impossible to determine the exact position and exact momentum of an electron simultaneously.
Reason : The path of an electron in an atom is clearly defined.

22 / 45

If n = 6, the correct sequence for filling of electrons will be :

23 / 45

Which transition in the hydrogen atomic spectrum will have the same wavelength as the transition, n = 4 to n = 2 of He+ spectrum?

24 / 45

Which of the following statement(s) is/are incorrect regarding photoelectric effect?
(i) The number of electrons ejected is proportional to the intensity of light.
(ii) There is some time lag between the striking of light beam on the metal surface and the ejection of electrons.
(iii) The kinetic energy of ejected electrons depends upon the brightness of light.
(iv) The kinetic energy of the ejected electron is proportional to the frequency of the incident radiation.

25 / 45

Match the columns

26 / 45

In hydrogen atomic spectrum, a series limit is found at 12186.3 cm-1. Then it belong to

27 / 45

If the alpha-particles are projected against the following atoms Fe, Be, Mg, Al then increasing order in which the alpha-particle feel repulsion will be

28 / 45

The deflection of the particles from their path in presence of electric and magnetic field will be maximum in which of the following.

29 / 45

Which of the following sets of quantum numbers is correct?

30 / 45

For Balmer series in the spectrum of atomic hydrogen, the wave number of each line is given by υ = Rh(1/n12 - 1/n22) where RH is a constant and n1 and n2 are integers. Which
of the following statement(s) is (are) correct?

(i) As wavelength decreases, the lines in the series converge.
(ii) The integer n1 is equal to 2.
(iii) The ionization energy of hydrogen can be calculated from the wave number of these lines.
(iv) The line of longest wavelength corresponds to n2 = 3.

31 / 45

The orbital diagram in which the Aufbau principle is violated is :

32 / 45

What did Rutherford’s alpha-particle scattering experiment not prove?

33 / 45

The electrons identified by quantum numbers n and l :
(A) n = 4, l = 1 (B) n = 4, l = 0
(C) n = 3, l = 2 (D) n = 3, l = 1
can be placed in order of increasing energy as :

34 / 45

What will be the difference between electromagnetic radiation shown in A and B respectively ?

(i) Velocity (ii) Wavelength
(iii) Frequency (iv) Energy

35 / 45

Assertion : Black body is an ideal body that emits and absorbs radiations of all frequencies.
Reason : The frequency of radiation emitted by a body goes from a lower frequency to higher frequency with an increase in temperature.

36 / 45

If uncertainty in position and momentum are equal, then uncertainty in velocity is :

37 / 45

The measurement of the electron position is associated with an uncertainty in momentum, which is equal to 1×10-18 g cm s-1. The uncertainty in electron velocity is,
(mass of an electron is 9 × 10-28 g)

38 / 45

The increasing order for the values of e/m (charge/mass) is

39 / 45

A photon of frequency v, incident upon a hydrogen atom in its ground state ionizes it and ejects the electron,which is observed to have a kinetic energy of 0.4 eV. Calculate v. (Neglect the kinetic energy of the nucleus)

40 / 45

Which of the following statements concerning the quantum numbers are correct ?
(i) Angular quantum number determines the three dimensional shape of the orbital.
(ii) The principal quantum number determines the orientation and energy of the orbital.
(iii) Magnetic quantum number determines the size of the orbital.
(iv) Spin quantum number of an electron determines the orientation of the spin of electron relative to the chosen axis.
The correct set of option is

41 / 45

Which of the following electronic configuration of d-orbital will have highest affinity for gaining an electron?

42 / 45

The potential energy of electron present in ground state of Li2+ ion is represented by :

43 / 45

The correct order of increasing energy of atomic orbitals is

44 / 45

Arrange the following elements in the order of ease of detection of wave properties, in the de Broglie experiment. H, Li, Be, B, K

45 / 45

If the radius of first Bohr orbit of H atom is x, then de Broglie wavelength of electron in 3rd orbit is nearly :

 

Your score is

The average score is 5%

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STRUCTURE OF ATOM-3

2

TEST SYLLABUS : STRUCTURE OF ATOM
Your Target is to secure Good Rank in NEET - 2020

Important Instructions:

(1) There is only one correct option.

(2) Duration of Test is 1 Hour and Questions Paper Contains 45 Questions. The Max. Marks are 180.
(3) Each correct answer carries 4 marks, while 1 mark will be deducted for every wrong answer. Guessing of answer reduces your effort.

1 / 45

Which of the following is not correct for electronic distribution in the ground state ?

2 / 45

For which one of the following sets of four quantum numbers, an electron will have the heighest energy?

3 / 45

If the Planck’s constant h = 6.6×10-34 Js, the de Broglie wavelength of a particle having momentum of 3.3 × 10-24 kg ms-1 will be

4 / 45

What can be the representation of the orbital having 3 angular nodes and n = 5.

5 / 45

The Heisenberg uncertainity principle will be most significant for which of the following object ?

6 / 45

Which set of quantum numbers are not possible?

7 / 45

The total number of electrons that can be accommodated in all orbitals having principal quantum number 2 and azimuthal quantum number 1 is

8 / 45

According to the Bohr theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon ?

9 / 45

The number of orbitals present in the fifth shell will be

10 / 45

The orientation of an atomic orbital is governed by

11 / 45

Uncertainty in the position of an electron (mass = 9.1 × 10–31 kg) moving with a velocity 300 ms–1, accurate upto 0.001% will be (h = 6.63 × 10–34 Js)

12 / 45

The electronic configuration of an element is 1s2, 2s2 2p6, 3s2 3p6 3d5, 4s1. This represents its

13 / 45

Heisenberg uncertainty principle can be explained as

14 / 45

The electronic configuration of gadolinium (Atomic number 64) is

15 / 45

Which of the following sets of quantum numbers is correct for an electron in 4f orbital ?

16 / 45

Which of the following is not permissible arrangement of electrons in an atom?

17 / 45

If the energy difference between the ground state of an atom and its excited state is 4.4 × 10-4 J, the wavelength of photon required to produce the transition :

18 / 45

The mass of a photon with a wavelength equal to 1.54 × 10-8 cm is

19 / 45

If there are five radial nodes, then what can be the correct representation of the orbital for n = 8.

20 / 45

Which of the following graph correspond to one node

 

21 / 45

For azimuthal quantum number l = 3, the maximum number of electrons will be

22 / 45

In a given atom no two electrons can have the same values for all the four quantum numbers. This is called

23 / 45

Which of the following represents correct set of the four quantum numbers for an electron in a 4d subshell ?

24 / 45

The order of filling of electrons in the orbitals of an atom will be

25 / 45

An ion has 18 electrons in the outermost shell, it is

26 / 45

Heisenberg's uncertainity principle is applicable to

27 / 45

What will be the sum of all possible values of l and m for n = 5 ?

28 / 45

The position of both, an electron and a helium atom is known within 1.0 nm. Further the momentum of the electron is known within 5.0 × 1026 kg ms-1. The minimum uncertainty in the measurement of the momentum of the helium atom is

29 / 45

Which of the following statements do not form a part of Bohr’s model of hydrogen atom ?

30 / 45

The de Broglie wavelength of a car of mass 1000 kg and velocity 36 km/hr is :

31 / 45

If electron, hydrogen, helium and neon nuclei are all moving with the velocity of light, then the wavelength associated with these particles are in the order

32 / 45

The shortest wavelength in hydrogen spectrum of Lyman series when RH = 109678 cm-1 is

33 / 45

The number of spherical nodes in 3p orbitals are

34 / 45

The uncertainty in the position of an electron (mass = 9.1 × 10-28 g) moving with a velocity of 3.0 × 104 cm s-1 accurate upto 0.011% will be

35 / 45

The values of Planck's constant is 6.63 × 10-34 Js. The velocity of light is 3.0 × 108 m s-1. Which value is closest to the wavelength in nanometres of a quantum of light with
frequency of 8 × 1015 s-1?

36 / 45

The de Broglie wavelength of a tennis ball of mass 60 g moving with a velocity of 10 metres per second is approximately Planck’s constant, h = 6.63 × 10-34 Js

37 / 45

The following quantum numbers are possible for how many orbital(s) n = 3, l = 2, m = +2 ?

38 / 45

Which of the following sets of quantum numbers represents the highest energy of an atom?

39 / 45

What is the correct orbital designation of an electron with the quantum number, n = 4, l = 3, m = – 2, s = 1/2 ?

40 / 45

Number of unpaired electrons in N2+ is

41 / 45

Bohr’s model is not able to account for which of the following.

42 / 45

What is the expression of frequency (υ) associated with absorption spectra of the photon.

43 / 45

The orbitals are called degenerate when

44 / 45

The number of d-electrons retained in Fe2+ (At. no. of Fe = 26) ion is

45 / 45

Arrange the orbital of same shell in the increasing order of shielding strength of the outer shell of electrons. s, f, d, p

Your score is

The average score is 1%

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STRUCTURE OF ATOM-2

2

TEST SYLLABUS : STRUCTURE OF ATOM
Your Target is to secure Good Rank in NEET - 2020

Important Instructions:

(1) There is only one correct option.

(2) Duration of Test is 1 Hour and Questions Paper Contains 45 Questions. The Max. Marks are 180.
(3) Each correct answer carries 4 marks, while 1 mark will be deducted for every wrong answer. Guessing of answer reduces your effort.

1 / 45

Which of the following statements about the electron is incorrect?

2 / 45

When beryllium is bombarded with alpha particles (Chadwick’s experiment) extremely penetrating radiations, which cannot be deflected by electrical or magnetic field are
given out. These are :

3 / 45

Nucleons are

4 / 45

In Bohr’s model, atomic radius of the first orbit is y, the radius of the 3rd orbit, is

5 / 45

The first emission line of hydrogen atomic spectrum in the Balmer series appears is (R = Rydberg constant)

6 / 45

The energy of electron in first energy level is - 21.79 x10-12 erg per atom. The energy of electron in second energy level is :

7 / 45

What does negative sign in the electronic energy for hydrogen atom convey.

8 / 45

The value of Planck's constant is 6.63 × 10-34 Js. The velocity of light is 3.0 × 108 m s-1. Which value is closest to the wavelength in nanometers of a quantum of light with frequency of 8 × 1015 s-1 ?

9 / 45

Which of the following scientists explained his model on the basis of centrifugal force ?

10 / 45

While performing cathode ray experiments, it was observed that there was no passage of electric current under normal conditions. Which of the following can account for this observation ?

11 / 45

The radius of 1st Bohr’s orbit for hydrogen atom is ‘r’. The radius of second Bohr’s orbit is

12 / 45

Neutron is discovered by

13 / 45

For a Bohr atom angular momentum M of the electron is (n = 0, 1, 2, .....) :

14 / 45

Which is correct statement about proton ?

15 / 45

In a hydrogen atom, if energy of an electron in ground state is 13.6. eV, then that in the 2nd excited state is

16 / 45

What is the optimum conditions required to study the conduction of electricity through gases.

17 / 45

Which of the scientist were able to prove that atom is no longer non-divisible?

18 / 45

Which one of the following pairs is not correctly matched ?

19 / 45

When atoms are bombarded with alpha particles, only, a few in million suffer deflection, others pass out undeflected. This is because

20 / 45

Which of the following does not contain number of neutrons equal to that of 18Ar40 ?

21 / 45

The ideal body, which emits and absorbs radiations of all frequencies, is called a black body and the radiation emitted by such a body is called

22 / 45

The number of electrons and neutrons of an element is 18 and 20 respectively. Its mass number is

23 / 45

If the wavelength of the electromagnetic radiation is increased to thrice the digital value, then what will be the percent change in the value of frequency of the electromagnetic radiation.

24 / 45

Which is the correct schematic representation of the graph of black body radiation.

 

25 / 45

When a metal surface is exposed to solar radiations

26 / 45

Cathode rays are deflected by

27 / 45

Which of the rays are not deflected by the electric and magnetic field ?

28 / 45

If r is the radius of the first orbit, the radius of nth orbit of H-atom is given by

29 / 45

From the data given below A, B, C and D respectively are,

(A) 10 e-, atomic no. 11 (B) 10 e-, atomic no. 6
(C) 10 e-, atomic no. 10 (D) 10 e-, atomic no. 9

30 / 45

In photoelectric effect, at which frequency electron will be ejected with certain kinetic energy (υo = threshold frequency).

31 / 45

Which of the following properties of atom could be explained correctly by Thomson Model of atom?

32 / 45

The frequency of radiation emitted when the electron falls from n = 4 to n = 1 in a hydrogen atom will be (Given : ionization energy of H=2.18 ×10-18J atom–1and h = 6.625 ×10-34J s )

33 / 45

The ionisation potential of a hydrogen atom is –13.6 eV. What will be the energy of the atom corresponding to n = 2.

34 / 45

Rutherford’s experiment which established the nuclear model of the atom used a beam of

35 / 45

The energy of second Bohr orbit of the hydrogen atom is -328 kJ mol-1; hence the energy of fourth Bohr orbit would be:

36 / 45

Number of protons, neutrons and electrons in the element 89X231 is

37 / 45

The radius of hydrogen atom in the ground state is 0.53 Å. The radius of Li2+ ion (atomic number = 3) in a similar state is

38 / 45

Which of the following statements do not form a part of Bohr’s model of hydrogen atom ?

39 / 45

Arrange the following in terms of penetrating power. α-rays, β-rays, γ-rays

40 / 45

The number of electrons in [4019K]-1 is

41 / 45

Which of the following pairs will have same chemical properties ?

42 / 45

Suppose beam containing all three fundamental subatomic particles are allowed to pass through an electric field as shown in figure. The subatomic particles detected at three points A, B and C on the screen respectively are ?

43 / 45

In the photo-electron emission, the energy of the emitted electron is

44 / 45

Millikan performed an experiment method to determine which of the following ?

45 / 45

Which one of the following is not the characteristic of Planck’s quantum theory of radiation ?

Your score is

The average score is 9%

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STRUCTURE OF ATOM: TEST-1

9

TEST SYLLABUS : STRUCTURE OF ATOM
Your Target is to secure Good Rank in NEET - 2020

Important Instructions:

(1) There is only one correct option.

(2) Duration of Test is 1 Hour and Questions Paper Contains 45 Questions. The Max. Marks are 180.
(3) Each correct answer carries 4 marks, while 1 mark will be deducted for every wrong answer. Guessing of answer reduces your effort.

1 / 45

The velocity of particle A is 0.1 ms-1 and that of particle B is 0.05 ms-1. If the mass of particle B is five times that of A, then the ratio of de-Broglie wavelengths associated with the particles A and B is

2 / 45

Which of the following statements are not correct about electromagnetic radiation ?
(i) Electromagnetic waves require medium to travel.
(ii) Different electromagnetic radiations travel at same speed in vaccum.
(iii) The oscillating electric and magnetic fields produced by oscillating charged particles are perpendicular to each other, but not to the direction of propagation.
(iv) The oscillating electric field and magnetic field are perpendicular to each other, and also to the direction of propagation.

3 / 45

In an atom, an electron is moving with a speed of 600 m/s with an accuracy of 0.005%. Certainity with which the position of the electron can be located is ( h = 6.6 ×10-34 kgm2s-1, mass of electron, em= 9.1 ×10-31kg)

4 / 45

An element has atomic number 11 and mass number 24. What does the nucleus contain?

5 / 45

Which of the following transitions of electrons in the hydrogen atom will emit maximum energy ?

6 / 45

Bohr model can explain :

7 / 45

Calculate the velocity of ejected electron from the metal surface when light of frequency 2 × 1015 Hz fall on the metal surface and the threshold frequency is 7 × 1014 Hz for metal ?

8 / 45

Match the columns.
Column-I______Column-II
(Atom / Ion).......(Electronic configuration)
(A) Cu..............(p)1s2 2s2 2p6 3s2 3p6 3d10
(B) Cu2+ .......(q) 1s2 2s2 2p6 3s2 3p6 3d10 4s2
(C) Zn2+.........(r) 1s2 2s2 2p6 3s2 3p6 3d10 4s1
(D) Cr3+.........(s)1s2 2s2 2p6 3s2 3p6 3d9
(t) 1s2 2s2 2p6 3s2 3p6 3d3

 

9 / 45

Which of the following statement is not correct about the characteristics of cathode rays?

10 / 45

What is the ratio of mass of an electron to the mass of a proton?

11 / 45

In continous spectrum light of (i)_ wavelength is deviated the ii_

12 / 45

An electron from one Bohr stationary orbit can go to next higher orbit

13 / 45

Match the columns.
Column-I                        Column-II
(A) 11H, 21H and 31H.....(p) Isobars
(B) 146C and 147N.........(q) Isotopes
(C) Na+ and Mg2+..........(r) Isoelectronic species

14 / 45

Arrange the electromagnetic radiations a, b, c, d and e in increasing order of energy. Frequencies of a, b and c are 1015, 1014 and 1017 respectively whereas wavelength of(d) and (e) are 350 nm and 100 nm respectively ?

15 / 45

Among species H, Li2+, He+, Be3+ and Al3+ Bohr’s model was able to explain the spectra of

16 / 45

The third line of the Balmer series, in the emission spectrum of the hydrogen atom, is due to the transition from the

17 / 45

The lightest particle is :

18 / 45

Chlorine exists in two isotopic forms, Cl-37 and Cl-35 but its atomic mass is 35.5. This indicates the ratio of Cl-37 and Cl-35 is approximately

19 / 45

Which is not true with respect to cathode rays?

20 / 45

Rutherford’s α-particle dispersion experiments concludes

21 / 45

In discharge tube experiment stream of negatively charged particles travel from

22 / 45

Which of the following is never true for cathode rays ?

23 / 45

An electron has principal quantum number 3. The number of its (i) subshells and (ii) orbitals would be respectively

24 / 45

Two fast moving particles X and Y are associated with de Broglie wavelengths 1 nm and 4 nm respectively. If mass of X in nine times the mass of Y, the ratio of kinetic energies of X and Y would be

25 / 45

‘A’ represents mass no. and Z represents atomic no. then alpha-decay is characterized by

26 / 45

The energy of electron in first energy level is -21.79 ×10-12  erg per atom. The energy of electron in second energy level is :

27 / 45

Bohr’s theory can be applied to which of the following ions.

28 / 45

In which of the following Bohr’s stationary state, the electron will be at maximum distance from the nucleus ?

29 / 45

What is the difference between two species if one has atomic mass = 14 and atomic number = 7 whereas the
other has atomic mass = 14 and atomic number = 6 ?

30 / 45

The measurement of the electron position is associated with an uncertainty in momentum, which is equal to 1×10-18 g cm s-1. The uncertainty in electron velocity is, (mass of an electron is 9 × 10-28 g)

31 / 45

The wavelength (in cm) of second line in the Lyman series of hydrogen atomic spectrum is (Rydberg constant= R cm-1)

 

32 / 45

If the nitrogen atom has electronic configuration 1s7, it would have energy lower than that of the normal ground state
configuration 1s22s22p3, because the electrons would be closer to the nucleus. Yet 1s7 is not observed because it violates.

33 / 45

The discovery of neutron became very late because :

34 / 45

Assertion : The position of an electron can be determined exactly with the help of an electron microscope.
Reason : The product of uncertainty in the measurement of its momentum and the uncertainty in the measurement of the position cannot be less than a finite limit.

35 / 45

The Li2+ion is moving in the third stationary state, and its linear momentum is 7.3 × 10-34 kg ms-1. Calculate its angular momentum.

36 / 45

Rutherford’s experiment on the scattering of alpha-particles showed for the first time that the atom has :

37 / 45

Which of the following pairs have identical values of e/m?

38 / 45

The line spectrum of He+ ion will resemble that of

39 / 45

According to Bohr's theory, the angular momentum of an electron in 5th orbit is

40 / 45

Atoms with same mass number but different atomic numbers are called

41 / 45

The number of neutrons in dipositive zinc ion with mass number 70 is

42 / 45

The number of electrons, neutrons and protons in a species are equal to 10, 8 and 8 respectively. The proper symbol of the species is

43 / 45

Which of the following is related with both wave nature and particle nature ?

44 / 45

Which combinations of quantum numbers, n, l , m and s for electron in an atom does not provide a permissible solution of the wave equation ?

45 / 45

In which of the following the amount of deviation from their path in the presence of electric and magnetic field will be maximum?

Your score is

The average score is 15%

0%

STRUCTURE OF ATOM (TEST-1)

9

TEST SYLLABUS : STRUCTURE OF ATOM
Your Target is to secure Good Rank in NEET - 2020

Important Instructions:

(1) There is only one correct option.

(2) Duration of Test is 1 Hour and Questions Paper Contains 45 Questions. The Max. Marks are 180.
(3) Each correct answer carries 4 marks, while 1 mark will be deducted for every wrong answer. Guessing of answer reduces your effort.

1 / 45

The measurement of the electron position is associated with an uncertainty in momentum, which is equal to 1×10-18 g cm s-1. The uncertainty in electron velocity is, (mass of an electron is 9 × 10-28 g)

2 / 45

Atoms with same mass number but different atomic numbers are called

3 / 45

Calculate the velocity of ejected electron from the metal surface when light of frequency 2 × 1015 Hz fall on the metal surface and the threshold frequency is 7 × 1014 Hz for metal ?

4 / 45

Which of the following statement is not correct about the characteristics of cathode rays?

5 / 45

Which of the following transitions of electrons in the hydrogen atom will emit maximum energy ?

6 / 45

The wavelength (in cm) of second line in the Lyman series of hydrogen atomic spectrum is (Rydberg constant= R cm-1)

 

7 / 45

Rutherford’s experiment on the scattering of alpha-particles showed for the first time that the atom has :

8 / 45

The number of electrons, neutrons and protons in a species are equal to 10, 8 and 8 respectively. The proper symbol of the species is

9 / 45

Which of the following is related with both wave nature and particle nature ?

10 / 45

Bohr model can explain :

11 / 45

In an atom, an electron is moving with a speed of 600 m/s with an accuracy of 0.005%. Certainity with which the position of the electron can be located is ( h = 6.6 ×10-34 kgm2s-1, mass of electron, em= 9.1 ×10-31kg)

12 / 45

In which of the following the amount of deviation from their path in the presence of electric and magnetic field will be maximum?

13 / 45

The velocity of particle A is 0.1 ms-1 and that of particle B is 0.05 ms-1. If the mass of particle B is five times that of A, then the ratio of de-Broglie wavelengths associated with the particles A and B is

14 / 45

According to Bohr's theory, the angular momentum of an electron in 5th orbit is

15 / 45

In which of the following Bohr’s stationary state, the electron will be at maximum distance from the nucleus ?

16 / 45

Match the columns.
Column-I______Column-II
(Atom / Ion).......(Electronic configuration)
(A) Cu..............(p)1s2 2s2 2p6 3s2 3p6 3d10
(B) Cu2+ .......(q) 1s2 2s2 2p6 3s2 3p6 3d10 4s2
(C) Zn2+.........(r) 1s2 2s2 2p6 3s2 3p6 3d10 4s1
(D) Cr3+.........(s)1s2 2s2 2p6 3s2 3p6 3d9
(t) 1s2 2s2 2p6 3s2 3p6 3d3

 

17 / 45

The line spectrum of He+ ion will resemble that of

18 / 45

Arrange the electromagnetic radiations a, b, c, d and e in increasing order of energy. Frequencies of a, b and c are 1015, 1014 and 1017 respectively whereas wavelength of(d) and (e) are 350 nm and 100 nm respectively ?

19 / 45

What is the difference between two species if one has atomic mass = 14 and atomic number = 7 whereas the
other has atomic mass = 14 and atomic number = 6 ?

20 / 45

The Li2+ion is moving in the third stationary state, and its linear momentum is 7.3 × 10-34 kg ms-1. Calculate its angular momentum.

21 / 45

Chlorine exists in two isotopic forms, Cl-37 and Cl-35 but its atomic mass is 35.5. This indicates the ratio of Cl-37 and Cl-35 is approximately

22 / 45

An electron from one Bohr stationary orbit can go to next higher orbit

23 / 45

What is the ratio of mass of an electron to the mass of a proton?

24 / 45

An element has atomic number 11 and mass number 24. What does the nucleus contain?

25 / 45

In continous spectrum light of (i)_ wavelength is deviated the ii_

26 / 45

The lightest particle is :

27 / 45

If the nitrogen atom has electronic configuration 1s7, it would have energy lower than that of the normal ground state
configuration 1s22s22p3, because the electrons would be closer to the nucleus. Yet 1s7 is not observed because it violates.

28 / 45

Which combinations of quantum numbers, n, l , m and s for electron in an atom does not provide a permissible solution of the wave equation ?

29 / 45

Rutherford’s α-particle dispersion experiments concludes

30 / 45

The discovery of neutron became very late because :

31 / 45

An electron has principal quantum number 3. The number of its (i) subshells and (ii) orbitals would be respectively

32 / 45

Two fast moving particles X and Y are associated with de Broglie wavelengths 1 nm and 4 nm respectively. If mass of X in nine times the mass of Y, the ratio of kinetic energies of X and Y would be

33 / 45

The energy of electron in first energy level is -21.79 ×10-12  erg per atom. The energy of electron in second energy level is :

34 / 45

Bohr’s theory can be applied to which of the following ions.

35 / 45

Assertion : The position of an electron can be determined exactly with the help of an electron microscope.
Reason : The product of uncertainty in the measurement of its momentum and the uncertainty in the measurement of the position cannot be less than a finite limit.

36 / 45

Which of the following pairs have identical values of e/m?

37 / 45

Match the columns.
Column-I                        Column-II
(A) 11H, 21H and 31H.....(p) Isobars
(B) 146C and 147N.........(q) Isotopes
(C) Na+ and Mg2+..........(r) Isoelectronic species

38 / 45

Which of the following is never true for cathode rays ?

39 / 45

The number of neutrons in dipositive zinc ion with mass number 70 is

40 / 45

‘A’ represents mass no. and Z represents atomic no. then alpha-decay is characterized by

41 / 45

In discharge tube experiment stream of negatively charged particles travel from

42 / 45

Which is not true with respect to cathode rays?

43 / 45

The third line of the Balmer series, in the emission spectrum of the hydrogen atom, is due to the transition from the

44 / 45

Which of the following statements are not correct about electromagnetic radiation ?
(i) Electromagnetic waves require medium to travel.
(ii) Different electromagnetic radiations travel at same speed in vaccum.
(iii) The oscillating electric and magnetic fields produced by oscillating charged particles are perpendicular to each other, but not to the direction of propagation.
(iv) The oscillating electric field and magnetic field are perpendicular to each other, and also to the direction of propagation.

45 / 45

Among species H, Li2+, He+, Be3+ and Al3+ Bohr’s model was able to explain the spectra of

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