ECAT Pre Engineering Chemistry Chapter 5 MCQ Test With Answer

MCQ's Test For ECAT Chemistry Chapter 5 Atomic Structure

Try The MCQ's Test For ECAT Chemistry Chapter 5 Atomic Structure

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ECAT Chemistry Chapter 5 Atomic Structure

00:00
Question # 1

Anode is the surface on which probability of finding electron is:

Question # 2

Photons of yellow colour are ______ energetic than violet colour

Question # 3

An electron has principal quantum number 3. The number of its 1 subshell and 2 orbitals would be respectively

Question # 4

In Bohr model of hydrogen atom the distance between adjacent orbits increases away from the nucleus, the energy difference between the orbits

Question # 5

When the electron jumps form third, fourth, fifth orbits to the second orbit, the transitions are known as

Question # 6

Electrons arranged in orbitals according to the increasing order of their n + l values, this rule is named as

Question # 7

The four quantum numbers of the valency electron of potassium are

Question # 8

E = hv is the

Question # 9

The degenerate orbitals p-sub shell are

Question # 10

A 4f orbital has

Question # 11

Number of neutrons in heavy hydrogen atom is

Question # 12

In the ground state, an element has 13 electrons in its M shell. The element is

Question # 13

Splitting of spectral lines when atoms are subjected to strong electric field is called:

Question # 14

Rutherford's atomic model suggests the existence of

Question # 15

Charge to mass ratio of electron was discovered by:

Question # 16

The electronic configuration of an atom/ion can be defined by the following

Question # 17

Which of the following orbitals have a dumb bell shape?

Question # 18

Neutron was discovered by:

Question # 19

Which is not true with respect to cathode rays?

Question # 20

The wave number of light emitted by a certain source is 2 x 105m. The wavelength of this light will be:

Question # 21

Which of the following has more unpaired d-electrons?

Question # 22

Positive particle in discharged tube is produced by ionization of gas molecules, which is caused by

Question # 23

The ratio of the ionization energy of H and Be3+is

Question # 24

Which quantum number is sufficient to describe the electron is hydrogen atom?

Question # 25

The credit of discovering neutron goes to

Question # 26

The electron in an atom

Question # 27

Maximum potential energy that an electron can have within the atom is:

Question # 28

Light emitted from a source has its wave length 500nm, then its wave number will be

Question # 29

The arrangement of subshells in the ascending order of their energy on complete filing of 4f subshell the entering electrons goes to

Question # 30

Balmer's series is in ______ region

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The wave number of light emitted by a certain source is 2 x 105m. The wavelength of this light will be:
A. 500 NM.
B. 500 M.
C. 200 NM.
D. 5 x 107m
2 For principle quantum number n=4, the total number of orbitals having l = 3 is
A. 3
B. 7
C. 5
D. 9
3 E = hv is the
A. Spectral equation
B. Plank's equation
C. de Broglie's equation
D. None of these
4 The wave number of the light emitted by a certain source is 2 x 106m-1. The wavelength of this light will be
A. 500 nm
B. 500 m
C. 200 nm
D. 5 x 107m
5 Which one of the following statements is true about discovery of neutrons?
A. These particles were formed by the bombardment of Alpha-particles on Beryllium.
B. These particles are formed by the spiting of alpha-particles.
C. These particles were discovered by natural radioactivity.
D. None of above.
6 The experimental evidences for the existence of atomic nucleus comes from:
A. Line spectrum of hydrogen.
B. Magnetic bonding of cathode rays.
C. Millikan oil drop experiment.
D. Scattering of alpha particles by thin metal foil.
7 When cathode rays strike the anode metal X-rays are emitted and not the positive rays because
A. Cathode rays are material particles
B. Cathode rays knock out electrons from anode, which emit X-rays when outer electron take their place
C. Cathode rays are absorbed by the nucleus
D. Cathode rays become heated
8 The charge over mass ratio of electron is:
A.

1.6 x 10-1 C Kg-1

B.

9.1 x 10-31 C Kg-1

C.

1.7588 x 1011 C Kg-1

D.

6.62 x 10-34 C Kg-1
9 In the atomic emission spectrum the lines which appear bright, appear dark in absorption spectrum because
A. The radiations emitted in emission spectrum are absorbed in absorption spectrum
B. Atomic emission spectrum is continuous
C. Atomic absorption spectrum is continuous
D. Distance between the lines increases
10 The energy of the first electron is helium will be
A. -13.6 eV
B. -54.4 eV
C. -5.44 eV
D. zero

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