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

Mass of simple electron is:

Question # 2

The wave number of the light emitted by a certain source is 2 x 106m-1. The wavelength of this light will be

Question # 3

The nature of positive ray depend on:

Question # 4

The rules which describe the distribution of electron in atomic energy levels are Auf-ban principle, Pauli's exclusion principle. Hunds rule. The pauli exclusion principle refers to the

Question # 5

Cathode rays drive a small paddle wheel placed in their path. This observation shows that

Question # 6

Photons of yellow colour are ______ energetic than violet colour

Question # 7

The radius of second Bohr's orbit is

Question # 8

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

Question # 9

Which one of the following particles has amass 1/1836 time, that of hydrogen?

Question # 10

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

Question # 11

Which have better penetrating power

Question # 12

The uncertainty principle was stated only

Question # 13

The number of de-electrons retained in Fe2+ (At.No. of Fe = 26) ions is

Question # 14

Orbital having same energy is called:

Question # 15

The wave length of electron as wave is 0.5 nm. What is the wave length in meter

Question # 16

Which of the following has more unpaired d-electrons?

Question # 17

Orbitals having same energy are called

Question # 18

Heaviest particle is

Question # 19

An orbital can accommodate maximum two electrons with opposite spins according to

Question # 20

Their e/m, ratio resembles with that of electrons

Question # 21

The maximum number of electrons in a subshell for which l = 3 is

Question # 22

Number of neutrons in heavy hydrogen atom is

Question # 23

When 3p orbital is complete, the entering electron goes into

Question # 24

When 6d orbital is complete, the entering electron goes into:

Question # 25

Energy of electron in first orbit of H atom is

Question # 26

With increasing principle quantum number, the energy difference between adjacent energy levels in H atom

Question # 27

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

Question # 28

The energy of ionization of an atom is the energy difference between orbital

Question # 29

Which is not true with respect to cathode rays?

Question # 30

The total number of orbitals possible for the quantum number n is

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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 In the ground state of an atom, the electron is present
A. In the nucleus
B. In the second shell
C. Nearest to the nucleus
D. Farthest from the nucleus
3 The total number of orbitals possible for the quantum number n is
A. n
B. n2
C. 2n
D. 2n2
4 Which of the following element's outermost orbits last electron has magnetic quantum number m=0?
A. Na
B. O
C. Cl
D. N
5 Energy of electron in the infinite Bohr orbit of H-atom is
A. 0 KJ/mole
B. 1 KJ/mole
C. -1 KJ/mole
D. -1313.32 KJ/mole
6 Neutrons was discovered by
A. Mosely
B. Milliken
C. Chadwick
D. Ruherford
7 Maximum potential energy that an electron can have within the atom is:
A. Equal to zero.
B. Less than zero.
C. Greater than zero.
D. Infinite
8 If the value of azimuthal quantum number is 3, then values of m the magnetic quantum no. will be
A. 0, 1, 2, 3
B. +3, +2, +1, -1, -2, -3
C. 0, -1, -2 ,-3
D. -3, 0, +3
9 When 3p orbital is complete, the entering electron goes into
A. 4s
B. 3d
C. 4p
D. 4f
10

Mass of simple electron is:
A.

9.1 x 10-31 kg

B.

9.1 x 10-30 kg

C.

1.66 x 10-31 kg

D.

9.1 x 10-31 kg

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