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

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Question # 1

The radiations with wavelength shorter than violet light are called

Question # 2

Which of the following is not isoelectronic?

Question # 3

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

Question # 4

The symbol of the element whose atoms have the outer most electronic configuration 2s22p3is

Question # 5

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

Question # 6

The wave number of the line emitted is 109.678 x 105m-1in the Lyman series when electron transition occurs

Question # 7

For principle quantum number n=4, the total number of orbitals having l = 3 is

Question # 8

Which of the following is not a sub-atomic particle

Question # 9

The radius of first orbit of hydrogen atom

Question # 10

E = hv is the

Question # 11

Photons of yellow colour are ______ energetic than violet colour

Question # 12

Neutron was discovered by:

Question # 13

Their e/m, ratio resembles with that of electrons

Question # 14

The correct set of quantum numbers (n,l and m) respectively of the unpaired electron of chlorine atom is

Question # 15

Which have better penetrating power

Question # 16

An electron with n = 3 , l = 2 will be in the sub-shell

Question # 17

Which of the following has more unpaired d-electrons?

Question # 18

Which is not true with respect to cathode rays?

Question # 19

e/m of cathode rays is same but for positive rays e/m changes by changing gas in the discharge tube because

Question # 20

The spectrum of He is expected to be similar to that of

Question # 21

The configuration 1s22s22p53s1shows

Question # 22

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

Question # 23

Smallest charge of electricity that has been measured so far is

Question # 24

Number of neutrons in heavy hydrogen atom is

Question # 25

In which of the following pairs, the numbers of electrons in the outermost shell are different?

Question # 26

What is the packet of energy called?

Question # 27

The size of electronic shell is described by

Question # 28

In the atomic emission spectrum the lines which appear bright, appear dark in absorption spectrum because

Question # 29

The quantum number which describes the shape of the orbital is

Question # 30

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

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Charge of an electron is:
A.

1.6 x 10-19 C

B.

9.1 x 10-34 C

C.

1.7588 x 1011 C

D.

6.62 x 10-34 C
2 In Millikan method for determination of charge on electron the air in the chamber is ionized by
A. Protons
B. Electric field
C. X-rays
D. a - particles
3 Which of the following is not a sub-atomic particle
A. Electron
B. Proton
C. Neutron
D. Deuteron
4 The mass of the neutron is of the order of
A. 10-23 kg
B. 10-24kg
C. 10-26kg
D. 10-27kg
5 The electronic configuration of an atom/ion can be defined by the following
A. Aufbau principle
B. Pauli's exclusion principle
C. Hund's Rule
D. All the above
6 The radius of second Bohr's orbit is
A. 0.053 nm
B. 0.053/4 nm
C. 0.053 x 4 nm
D. 0.053 x 20 nm
7 When electrons revolve in stationary orbits
A. There is no change in energy level
B. They vecome stationary
C. They are gaining kinetic energy
D. There is increase in energy
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
Question Image
A. Neutrons are attracted by nucleus
B. Neutrons carry out nuclear reactions
C. Neutrons carry no charge
D. Neutrons are electromagnetic radiations
10 Subsidiary quantum number specifies
A. size of orbital
B. shape of orbital
C. orientations of orbitals
D. Nuclear stability

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