set 3 MCQ Questions & Answers Detailed Explanation

Question : 1

Which of the following is/are the example/examples of chemical change?

1. Crystallization of sodium chloride
2. Melting of ice
3. Souring of milk

a) Only 3

b) 1, 2 and 3

c) Only 1 and 2

d) None of the above

Question : 2

The early attempt to classify elements as metals and nonmetals was made by

a) Lother Meyer

b) Lavoisier

c) Mendeleev

d) Henry Moseley

Question : 3

Example of corrosion is

a) Green coating on Copper

b) Brown coating on Iron

c) Black coating on Silver

d) Above three

Question : 4

Element A belongs to Group VII in p-block and element B belongs to Group I in s-block of the periodic table. Out of the following assumptions, the correct one is :

a) A and B are non-metals

b) A is a metal and B is a non-metal

c) A and B are metals

d) A is a non-metal and B is a metal

Question : 5

Which of the following are values of gas constant R ?

1. 0.0821 L atm k^–1mol^–1
2. 8.21 L torr k^–1mol^–1
3. 82.1 atm mL k^–1mol^–1
4. 8.314 J mol^–1k^–1

a) 1, 2 and 4

b) 1, 2 and 3

c) 1, 3 and 4

d) 2, 3 and 4

Question : 6

Consider the following statements regarding Bohr atomic model:

1. It introduces the idea of stationary orbits.
2. It assumes that the angular momentum of the electron is equal to -$(1/2)h/{2π}$
3. It uses the planetary model of the atom involving circular orbits.

a) 1 and 3

b) 1 and 2

c) 2 and 3

d) 1, 2 and 3