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

Question # 2

In the atomic emission spectrum the lines which appear bright, appear dark in absorption spectrum because

Question # 3

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

Question # 4

E = hv is the

Question # 5

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

Question # 6

The size of electronic shell is described by

Question # 7

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 # 8

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

Question # 9

Negatively charged particle nature of cathode rays was first demonstrated in 1895 by:

Question # 10

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

Question # 11

The quantum number which describes the shape of the orbital is

Question # 12

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

Question # 13

The nature of positive rays depend on:

Question # 14

With the reference of w/m ratio of anode rays, the e/m ratio of cathode rays s:

Question # 15

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

Question # 16

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

Question # 17

Rutherford's atomic model suggests the existence of

Question # 18

Which have better penetrating power

Question # 19

The number of neutrons in the element 94Be is

Question # 20

A 4f orbital has

Question # 21

Alpha rays consist of:

Question # 22

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

Question # 23

Which of the following is not a property of cathode rays

Question # 24

Quantum number values for 2p orbitals are

Question # 25

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

Question # 26

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

Question # 27

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

Question # 28

Charge on electron was discovered by:

Question # 29

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 # 30

In which of the following pairs, the numbers of electrons in the outermost shell are different?

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 The order of frequency of the following radiations unltraviolet, visible, infrared and microwave is
A. Microwave > infrared > visible > ultraviolet
B. Visible > ultraviolet > microwave > infrared
C. Ultraviolet > visible > infrared > microwave
D. Infrared > microwave > ultraviolet > visible
2 The arrangement of subshells in the ascending order of their energy on complete filing of 4f subshell the entering electrons goes to
A. 5s
B. 5p
C. 5d
D. 5f
3 1 erg of energy corresponds to
A. 6.02 x 1023J/mol
B. 6.02 x 1016J/mol
C. 1 erg/mol
D. 10-7J/mol
4

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
5 The divisibility of atom was shown by
A. Stoney
B. J.J. Thomson
C. Millikan
D. Rutherford
6 Orbitals having same energy are called
A. Hybrid orbitals
B. Valence orbitals
C. Degenerate orbitals
D. D-orbitals
7 Charge of an electron is:
A.

1.6 x 10-19 C

B.

9.1 x 10-34 C

C.

1.7588 x 1011 C

D.

6.62 x 10-34 C
8 Maximum potential energy that an electron can have within the atom is:
A. Equal to zero.
B. Less than zero.
C. Greater than zero.
D. Infinite
9
Question Image
A. Plank's equations
B. de Broglie's equations
C. Heisenburg's equation
D. None
10 In the ground state of an atom, the electron is present:
A. In the nucleus.
B. In the second shell.
C. Nearest to the nucleus.
D. farthest from the nucleus.

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