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 the 6d orbital is completed the entering electron goes into

Question # 2

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

Question # 3

The velocity of photon is:

Question # 4

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

Question # 5

The quantum number which determines the shape of the orbital is

Question # 6

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

Question # 7

Their e/m, ratio resembles with that of electrons

Question # 8

The electron in an atom

Question # 9

Rutherford's planetary like picture of the atomic modal was defective because

Question # 10

In the ground state of an atom, the electron is present:

Question # 11

Splitting of spectral lines of the hydrogen atom under the influence or magnetic field is called

Question # 12

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

Question # 13

What is the packet of energy called?

Question # 14

The e.m value for positive rays maximum for:

Question # 15

In the ground state of an atom, the electron is present

Question # 16

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

Question # 17

Charge to mass ratio (e/m) of the electron is determined by

Question # 18

The valence orbital configuration of an element with atomic number 23 is

Question # 19

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

Question # 20

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

Question # 21

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

Question # 22

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

Question # 23

Neutrons was discovered by

Question # 24

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

Question # 25

The value of Plank's constant 'h' is

Question # 26

Smallest charge of electricity that has been measured so far is

Question # 27

Pauli's principle is applicable to

Question # 28

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 # 29

Effective magnetic moment of Sc3+ion is

Question # 30

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

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 When the 6d orbital is completed the entering electron goes into
A. 7f
B. 7 s
C. 7 p
D. 7 d
2 Number of neutrons in heavy hydrogen atom is
A. 0
B. 1
C. 2
D. 3
3 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.
4 Proton was discovered by:
A. Chadwick
B. J.J. Rhomson
C. Millikan.
D. Goldstein.
5 When 3p orbital is complete, the entering electron goes into
A. 4s
B. 3d
C. 4p
D. 4f
6 When 6s orbital is complete then next electron goes to
A. 6p
B. 6d
C. 5d
D. 4f
7 Charge to mass ratio of electron was discovered by:
A. Millika.
B. Rutherford.
C. J.J. Thomson.
D. Chadwick.
8 Rutherford's planetary like picture of the atomic modal was defective because
A. It did not describe the quantity of positive charge
B. It did not explain the repulsion of protons within the nucleus
C. No empty space between nucleus and the electrons
D. Moving electron should radiate energy
9 The order of distance between the various Bohr orbits is
A. r2- r1> r3- r2> r4- r3> ......
B. r1> r2> r2- r3> r4-r3> .....
C. r2-r1= r3- r2= r4- r3> .....
D. r2- r1> r3- r2< r4- r3< ....
10 Their e/m, ratio resembles with that of electrons
A. Alpha rays
B. Beta rays
C. Gamma rays
D. X-rays

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