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

When potassium metal is exposed to violet light

Question # 2

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

Question # 3

If the value of principal quantum number is 3. the total possible values for magnetic quantum number will be

Question # 4

The atomic number of an element is 35 what is the total number of electrons present in all the p-orbitals of the ground state atom of that element?

Question # 5

Spectrum of white light is continuous becuase

Question # 6

Their e/m, ratio resembles with that of electrons

Question # 7

The orbital in Rutherford's model is

Question # 8

1 erg of energy corresponds to

Question # 9

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

Question # 10

Quantum number values for 2p orbitals are

Question # 11

The order of frequency of the following radiations unltraviolet, visible, infrared and microwave is

Question # 12

The principle quantum number describes

Question # 13

Which of the following is not charged particle

Question # 14

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

Question # 15

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

Question # 16

When cathode rays strike the anode metal X-rays are emitted and not the positive rays because

Question # 17

The value of Plank's constant 'h' is

Question # 18

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

Question # 19

The uncertainty principle was stated only

Question # 20

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

Question # 21

The total values of magnetic quantum number of subshell are five, the subshell is

Question # 22

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 # 23

Which of the following orbitals have a dumb bell shape?

Question # 24

Charge of an electron is:

Question # 25

When 6s orbital is complete then next electron goes to

Question # 26

E = hv is the

Question # 27

When electron jumps from n2= 2,3,4,5,.... orbit to n1= 1 orbit in the hydrogen atom, the radiations emitted give the spectral lines

Question # 28

Energy of electron in first orbit of H atom is

Question # 29

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

Question # 30

Charge to mass ratio of electron was discovered by:

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The limiting line of Blamer series in hydrogen spectrum lies in
A. Visible regions
B. Ultraviolet region
C. Infrared region
D. x-rays region
2 Positive particle in discharged tube is produced by ionization of gas molecules, which is caused by
A. Gas molecules collide with anode
B. Gas molecules are at high temperature
C. Gas molecules produce X-rays
D. Cathode rays remove electrons from gas molecules
3 In Bohr model of hydrogen atom the distance between adjacent orbits increases away from the nucleus, the energy difference between the orbits
A. Increases
B. Decreases
C. Reaming same
D. Orbits coincide
4 The nature of the positive rays depend on
A. The nature of the electrode
B. The nature of the discharge tube
C. The nature of the residual gas
D. All of the above
5 The principle quantum number describes
A. The distance form the nucleus
B. The shape of the orbital
C. The orientation of the orbital
D. The spin of the electron
6 The correct set of quantum numbers (n,l and m) respectively of the unpaired electron of chlorine atom is
A. 2,1,0
B. 2,1,1
C. 3,1,1
D. 3,2,1
7 The symbol of the element whose atoms have the outer most electronic configuration 2s22p3is
A. N
B. Li
C. P
D. Na
8 When 3p orbital is complete, the entering electron goes into
A. 4s
B. 3d
C. 4p
D. 4f
9 Energy of electron in an orbit according to Bohr theory is negative due to
A. Repulsion of electrons in the same orb
B. At infinity energy is zero ad a traction towards nucleus decreases energy
C. Electron has negative charge
D. Product of positive nuclear charge and negative charge is negative
10 The total values of magnetic quantum number of subshell are five, the subshell is
A. S-subshell
B. P-subshell
C. D-subshell
D. F-subshell

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