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 de-Brogile wavelength of a particle with mass 1g and velocity 100 m/s is

Question # 2

Splitting of spectral lines when atoms are subjected to strong electron field is called

Question # 3

The arrangement of subshells in the ascending order of their energy on complete filing of 4f subshell the entering electrons goes to

Question # 4

1 erg of energy corresponds to

Question # 5

Effective magnetic moment of Sc3+ion is

Question # 6

Consider the ground state of Cr atom (Z=24). The numbers of electrons with the azimuthal quantum numbers l = 1 and l = 2 are respectively

Question # 7

The electronic configuration of an atom/ion can be defined by the following

Question # 8

Energy of electron in an orbit according to Bohr theory is negative due to

Question # 9

The velocity of photon is:

Question # 10

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

Question # 11

The orbital in Rutherford's model is

Question # 12

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

Question # 13

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

Question # 14

The radius of first orbit of hydrogen atom

Question # 15

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

Question # 16

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 # 17

Which of the following is not a sub-atomic particle

Question # 18

Azimuthal quantum number of last electron of 11Na is

Question # 19

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

Question # 20

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

Question # 21

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

Question # 22

When electrons revolve in stationary orbits

Question # 23

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

Question # 24

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

Question # 25

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

Question # 26

Number of neutrons in heavy hydrogen atom is

Question # 27

If the value of azimuthal quantum number is 3, then values of m the magnetic quantum no. will be

Question # 28

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

Question # 29

The energy of the first electron is helium will be

Question # 30

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

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The wave number of the line emitted is 109.678 x 105m-1in the Lyman series when electron transition occurs
2 If the radius of first Bohr orbit be ao, then the radius of third Bohr orbit would be
A. 3 x ao
B. 6 x ao
C. 9 x ao
D. 1/2 x ao
3 Charge to mass ratio (e/m) of the electron is determined by
A. R. A. Millikan
B. J. J. Thompson
C. G. J, Stoney
D. None of these
4 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
5 The credit of discovering neutron goes to
A. Rutherford
B. Langmuir
C. Chadwick
D. Austen
6 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
7 The wave length of electron as wave is 0.5 nm. What is the wave length in meter
A. 5 x 10-9
B. 5 x 10-12
C. 5 x 10-6
D. 5 x 10-10
8 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
A. Voltage is low
B. Discharge tube is not coloured
C. Gas does not conduct current under ordinary pressure
D. Temperature low
9 When an electric current is passed through discharge tube at low pressure, cathode rays are emitted from cathode these rays consist of:
A. Alpha rays.
B. Negative particles.
C. Electromagnetic rays.
D. Positive particles.
10 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

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