NDA CHEMISTRY SECTIONAL TEST

Question 1:

Match list I and List II

A-IV, B-III,C-I,D-II

A-III, B-I,C-IV,D-II

A-III, B-IV,C-II,D-I

A-III, B-IV,C-I,D-II

Question 2:

The arrangement of elements in the Mendeleev Periodic Table is based on their

increasing atomic mass

increasing atomic number

decreasing atomic number

decreasing atomic mass

Question 3:

The phenomenon of radioactivity was discovered by

JJ Thomson

Marie curie

Henry Becquerel

Pierre Curie

Question 4:

Which of the following is the electronic configuration of chromium ?

[Ar]4s¹3d⁵

[Ar]4s²3d⁵

[Ar]4s³3d⁵

[Ar]4s²3d⁴

Question 5:

Which of the following statements does not form part of Bohr’s model of the hydrogen atom?

Electrons that move in a particular orbit do not lose or gain energy.

The angular momentum of an electron is quantized.

Bohr radius is 52.9 pm

The position and velocity of electrons cannot be determined simultaneously.

Question 6:

Electron, lightest stable subatomic particle. It carries a negative charge of 1.602 × 10⁻¹⁹ coulomb, which is considered the basic unit of electric charge. It is discovered by-

J.J Thomson

Goldstein

Chadwick

John Dalton

Question 7:

Which of the following electronic configuration is a violation of Hund’s rule?

1,2,3

Only 3

Only 4

1,2

Question 8:

An element ‘A’ belongs to the second period and group 16 of the Periodic Table. Valency of A is

6

3

2

1

Question 9:

The maximum number of electron present in n = 3 and s = +1/2 is

9

18

10

12

Question 10:

The properties of eka-boron predicted by Mendeleev are the same as the properties of later discovered element

Scandium

Germanium

Gallium

Aluminium

Question 11:

What is the maximum number of electrons in the K shell ?

2

8

18

32

Question 12:

Match List I and list II

A-I,B-II,C-III

A-II,B-III,C-I

A-I,B-III,C-II

A-III , B-I,C-II

Question 13:

Which of the following isotope is used for the determination of age of fossils?

¹²C

¹⁴C

¹³C

⁶⁰Co

Question 14:

Which of the following has mass equals to 1836 times the mass of electrons?

Neutron

Alpha particle

Electron

Proton

Question 15:

On descending a group, the electropositive character of elements-

Increase

Decrease

Remains same

First increase and then decrease

Question 16:

Directions – Question consist of two statements labelled as statement I and statement II . Examine both the statement and mark the correct choice according to the codes given below

Statement I – In gamma decay, number of protons does not change but neutrons change.

Statement II –Gamma rays are neutral in nature.

Both statement I and statement II are true and Statement II is the correct explanation of Statement I

Both statement I and statement II are true and Statement II is not the correct explanation of Statement I

Statement I is true, but statement II is false

Statement I is false, but II is true

Question 17:

An atom of X element has 7 protons. Its mass number is 14 and has 10 electrons. Identify X

Nitrogen atom

Nitrogen ion

Carbon atom

Oxygen ion

Question 18:

Ratio of radius of 2^nd orbit and 4^th orbit for hydrogen atom is

9 : 25

1:4

16 : 25

9 : 16

Question 19:

The relation between energy of radiation and its frequency was given by

Neil Bohr

Rutherford

Planck

De-broglie

Question 20:

Consider the following statements

In ₁₃Al²⁷

Mass number is 27
Number of neutrons is 27
Atomic number is 13
Number of electrons is 14

Which of the above statement is/are correct?

1,2,3

1,3

2,3,4

3,4

NDA CHEMISTRY SECTIONAL TEST - 3

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NDA CHEMISTRY SECTIONAL TEST - 3

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