set 3 MCQ Questions & Answers Detailed Explanation

Question : 1

What mass of hydrogen and oxygen will be produced on complete electrolysis of 18g of water?

a) 4g hydrogen and 32g oxygen

b) 2g hydrogen and 16g oxygen

c) 2g hydrogen and 32g oxygen

d) 4g hydrogen and 14g oxygen

Question : 2

The number value 6.022 × 10²³ is also called

a) Atomic Number

b) Avagadro’s number

c) Dalton Number

d) Mass Number

Question : 3

Which formula gives the maximum number of electrons in a shell?

a) 3n²

b) 2n²

c) n²

d) 4n²

Question : 4

Which of the following isotopes of carbon is/are used in carbon dating?

a) ₆ C¹⁴ only

b) ₆ C¹³ only

c) ₆ C¹² only

d) ₆ C¹² and ₆ C¹⁴

Question : 5

The number of neutrons in ₇Al²⁷ is

a) 14

b) 27

c) 40

d) 13

Question : 6

The formation of SO₂ and SO₃ explain

a) the law of multiple proportions

b) the law of definite properties

c) the law of conservation of mass

d) Boyle’s law