set 1 MCQ Questions & Answers Detailed Explanation

Question : 1

In the reaction : PbO + C ⟶ Pb + CO

a) C is reductant

b) PbO is oxidised

c) PbO is oxidant

d) Both (a) and (c)

Question : 2

The branch of chemistry which deals with study of the methods of detection and determination of elements and compounds is

a) Analytical chemistry

b) Physical chemistry

c) Nuclear chemistry

d) Bio chemistry

Question : 3

Which of the following statement is not correct ? To prevent food from getting rancid, we

a) flush bags of chips with an inert gas

b) store the food in air-tight containers

c) add antioxidants

d) increase the temperature of the food

Question : 4

The molecular formula P₂O₅ means that

a) there are twice as many P atoms in the molecule as there are O atoms

b) a molecule contains 2 atoms of P and 5 atoms of O

c) the ratio of the mass of P to the mass of O in the molecule is 2:5

d) the ratio of the mass of P to the mass of O in the molecule is 5 : 2

Question : 5

Chemical formula of Aluminium sulphate is

a) Al₃(SO₄)₂

b) Al₂ (SO₄)₃

c) AlSO₄

d) None of these