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

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

Question # 2

The quantum number which describes the shape of the orbital is

Question # 3

In the ground state of an atom the electron is present

Question # 4

Bohr model of atom is contradicted by:

Question # 5

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

Question # 6

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

Question # 7

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

Question # 8

The range of visible spectrum is

Question # 9

Which is not true with respect to cathode rays?

Question # 10

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

Question # 11

The orbitals having n + l = 5 are

Question # 12

The four quantum numbers of the valency electron of potassium are

Question # 13

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 # 14

When 3p orbital is complete, the entering electron goes into

Question # 15

Neutron was discovered by:

Question # 16

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

Question # 17

Number of neutrons in heavy hydrogen atom is

Question # 18

The nature of the positive rays depend on

Question # 19

The credit of discovering neutron goes to

Question # 20

Cathode rays emitted from cathode are

Question # 21

The e.m value for positive rays maximum for:

Question # 22

Which quantum number is sufficient to describe the electron is hydrogen atom?

Question # 23

An electron has principal quantum number 3. The number of its 1 subshell and 2 orbitals would be respectively

Question # 24

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

Question # 25

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

Question # 26

The nature of positive rays depend on:

Question # 27

The degenerate orbitals p-sub shell are

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

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

Question # 30

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

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 n + l value for 4f will
A. 2
B. 5
C. 7
D. 9
2 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
A. Lyman series
B. Blamer series
C. Paschen series
D. Brackett series
3 Cathode rays emitted from cathode are
A. Canal rays
B. Protons
C. Electrons
D. Positrons
4 Number of neutrons in heavy hydrogen atom is
A. 0
B. 1
C. 2
D. 3
5 When the electron jumps form second third, fourth orbit to the fist orbit, the transitions are known as
A. Balmer series
B. Lyman series
C. Pfund series
D. Brackett series
6 In the ground state, an element has 13 electrons in its M shell. The element is
A. Copper
B. Chromium
C. Nickel
D. Iron
7 When 3p orbital is complete, the entering electron goes into
A. 4s
B. 3d
C. 4p
D. 4f
8

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
9 The quantum number which describes the shape of the orbital is
A. Principle quantum number
B. Spin quantum number
C. Azimathal quantum number
D. Magnetic quantum number
10 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.

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