set 3 MCQ Questions & Answers Detailed Explanation

Question : 1

A single type of atom is found in

a) Mixture of minerals

b) Native elements

c) Compounds of minerals

d) None of the above

Question : 2

The atomic nucleus was discovered by

a) Dalton

b) Einstein

c) Rutherford

d) Thomson

Question : 3

Heavy water implies

a) deuterated water

b) water which contains SO₄^2- and CI– of calcium and magnesium

c) water which is used in heavy industries such as thermal power plants

d) water which has maximum density

Question : 4

The number value 6.022 × 10²³ is also called

a) Atomic Number

b) Avagadro’s number

c) Dalton Number

d) Mass Number

Question : 5

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 : 6

Valency of Cr in CrP$O_4$ is

a) 2

b) 3

c) 4

d) 1