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

Question # 2

Which of the following is not a property of cathode rays

Question # 3

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

Question # 4

The e.m value for positive rays maximum for:

Question # 5

n + l value for 4f will

Question # 6

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

Question # 7

Which is not true with respect to cathode rays?

Question # 8

Effective magnetic moment of Sc3+ion is

Question # 9

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

Question # 10

The value of charge on electron is

Question # 11

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

Question # 12

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

Question # 13

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

Question # 14

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

Question # 15

Orbitals having same energy are called

Question # 16

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

Question # 17

In Millikan method for determination of charge on electron the air in the chamber is ionized by

Question # 18

Smallest charge of electricity that has been measured so far is

Question # 19

The range of visible spectrum is

Question # 20

When potassium metal is exposed to violet light

Question # 21

Which of the following is not charged particle

Question # 22

E = hv is the

Question # 23

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

Question # 24

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

Question # 25

The wave number of the line emitted is 109.678 x 105m-1in the Lyman series when electron transition occurs

Question # 26

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

Question # 27

In Millikan method the oil droplet falls under the force of gravity but it moves upward due to

Question # 28

When electrons revolve in stationary orbits

Question # 29

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

Question # 30

The charge of an electron is determined by

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 Orbitals having same energy are called
A. Hybrid orbitals
B. Valence orbitals
C. Degenerate orbitals
D. D-orbitals
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 Which have better penetrating power
A. Alpha rays
B. Beta rays
C. Gamma rays
D. X-rays
4 When 3p orbital is complete, the entering electron goes into
A. 4s
B. 3d
C. 4p
D. 4f
5 Electrons arranged in orbitals according to the increasing order of their n + l values, this rule is named as
A. Hund's rule
B. Heisenberg's principle
C. Paulit exclusion principle
D. Auf bau principle
6 The radius of first orbit of H-atom is
A. 4.75 A°
B. 3.84 A°
C. 8.4 A°
D. 0.529 A°
7 An orbital can accommodate maximum two electrons with opposite spins according to
A. Heisenberg's principle
B. Aufbau principle
C. Hund's srule
D. Pauli exclusion principle
8 The total number of orbitals in a shell with principal quantum number 'n' is
A. 2n
B. 2n2
C. n2
D. n + 1
9 Energy of electron in first orbit of H atom is
A. -45.32 KJ/mole
B. -82.08 KJ/mole
C. -52.53 KJ/mole
D. -1313.31 KJ/mole
10 When 6d orbital is complete, the entering electron goes into:
A. 7f.
B. 7s.
C. 7p.
D. 7d.

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