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

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

Question # 2

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

Question # 3

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

Question # 4

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

Question # 5

Which one of the following statements is true about discovery of neutrons?

Question # 6

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

Question # 7

The atomic number of an element is 35 what is the total number of electrons present in all the p-orbitals of the ground state atom of that element?

Question # 8

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

Question # 9

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

Question # 10

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

Question # 11

The nature of positive ray depend on:

Question # 12

The quantum number which describes the shape of the orbital is

Question # 13

Heaviest particle is

Question # 14

The electron in an atom

Question # 15

The total number of orbitals in a shell with principal quantum number 'n' is

Question # 16

The four quantum numbers of the valency electron of potassium are

Question # 17

Which of the following element's outermost orbits last electron has magnetic quantum number m=0?

Question # 18

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

Question # 19

The order of frequency of the following radiations unltraviolet, visible, infrared and microwave is

Question # 20

The radius of first orbit of hydrogen atom

Question # 21

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

Question # 22

The nature of positive rays depend on:

Question # 23

Which of the following is not a sub-atomic particle

Question # 24

The radius of second Bohr's orbit is

Question # 25

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

Question # 26

Four d-orbitals contain four lobes while fifth contains only two lobes the orbital is

Question # 27

1 erg of energy corresponds to

Question # 28

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 # 29

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

Question # 30

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

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ECAT Chemistry Chapter 5 Important MCQ's

Sr.# Question Answer
1 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
2 The principle quantum number describes
A. The distance form the nucleus
B. The shape of the orbital
C. The orientation of the orbital
D. The spin of the electron
3 The value of Plank's constant 'h' is
A. 6.625 x 10-34
B. 6.625 x 10-34J sec
C. 6.625 x 10-34KJ
D. 6.625 x 10-34K Cal
4 Which of the following has more unpaired d-electrons?
A. Zn+
B. Fe2+
C. Ni3+
D. Cu+
5 Orbitals having same energy are called
A. Hybrid orbitals
B. Valence orbitals
C. Degenerate orbitals
D. D-orbitals
6 Azimuthal quantum number of last electron of 11Na is
A. 1
B. 2
C. 3
D. 0
7 Proton was discovered by:
A. Chadwick
B. J.J. Rhomson
C. Millikan.
D. Goldstein.
8 The radius of first orbit of hydrogen atom
A. 0.329 A°
B. 0.429 A°
C. 0.529 A°
D. 0.229 A°
9 When 6d orbital is complete, the entering electron goes into:
A. 7f.
B. 7s.
C. 7p.
D. 7d.
10 When cathode rays strike the anode metal X-rays are emitted and not the positive rays because
A. Cathode rays are material particles
B. Cathode rays knock out electrons from anode, which emit X-rays when outer electron take their place
C. Cathode rays are absorbed by the nucleus
D. Cathode rays become heated

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