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

Which of the following orbitals have a dumb bell shape?

Question # 2

Orbitals having same energy are called

Question # 3

Electrons in degenerate orbitals are placed in separate orbitals with same spin according to

Question # 4

Sodium chloride imparts a yellow colour to the Bunsen flame. This can be interpreted due to the

Question # 5

The range of visible spectrum is

Question # 6

The experimental evidences for the existence of atomic nucleus comes from:

Question # 7

Effective magnetic moment of Sc3+ion is

Question # 8

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

Question # 9

Bohr model of atom is contradicted by:

Question # 10

Which of the following particles has longest wavelength, if they have same speed:

Question # 11

The radius of first orbit of H-atom is

Question # 12

Which of the following is not charged particle

Question # 13

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

Question # 14

Quantum number values for 2p orbitals are

Question # 15

For a 3P subshell the set of principle and azimuthal quantum number is

Question # 16

No cathode rays are produced in the discharged tube when gas is under ordinary pressure even if voltage of 5000 to 10000 is applies. This reason is

Question # 17

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

Question # 18

When the 6d orbital is completed the entering electron goes into

Question # 19

Neutrons was discovered by

Question # 20

The quantum number which describe the orientation of the orbitals is

Question # 21

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

Question # 22

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

Question # 23

1 erg of energy corresponds to

Question # 24

Rutherford's experiment led to the discovery of

Question # 25

The mass of the neutron is of the order of

Question # 26

The uncertainty principle was stated only

Question # 27

The velocity of photon is:

Question # 28

The value of R (Rydberg's constant) is _______ m-1

Question # 29

The configuration 1s22s22p53s1shows

Question # 30

The nature of positive ray depend on:

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The nature of positive ray depend on:
A. The nature of electrode.
B. The nature of discharge tube.
C. The nature of residual gas.
D. All of above.
2 The quantum number which describe the orientation of the orbitals is
A. Spin quantum number
B. Principle quantum number
C. Azimathal quantum number
D. Magnetic quantum number
3 The orbitals having n + l = 5 are
A. 2p, 3d,3s
B. 3p, 3d, 5s
C. 3s, 4p, 4d
D. 5s, 4p, 3d
4 The nature of positive rays depend on:
A. Nature of discharge tube.
B. Nature of resident gas.
C. Nature of electrode.
D. All of above.
5 The quantum number which determines the shape of the orbital is
A. principal
B. azimuthal
C. magnetic
D. spin
6 The electron in an atom
A. moves randomly around the nucleus
B. has fixed space around the nucleus
C. is stationary in various energy levels
D. moves around its nucleus in definite energy levels
7 When potassium metal is exposed to violet light
A. Ejection of electrons takes place
B. Ejection of some potassium atoms occurs
C. There is no effect
D. The absorption of electrons takes place
8 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
9 In which of the following pairs, the numbers of electrons in the outermost shell are different?
A. As,Sb
B. Ge,Sn
C. In,pt
D. Se,Te
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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