general concepts of chemistry - Category wise Question and Answer Practice Test with Solutions

general concepts of chemistry PRACTICE TEST [2 - EXERCISES]

set 1

set 2

Question : 1

Chemical formula of Aluminium sulphate is

a) Al3(SO4)2

b) Al2 (SO4)3

c) AlSO4

d) None of these

Answer: (b)

Question : 2

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

Answer: (b)

Question : 3

Which one is a bivalent ion?

a) sulphide

b) sodium

c) calcium

d) Both (b) and (c)

Answer: (d)

Ca++ and S– –

Question : 4

In the reaction : PbO + C ⟶ Pb + CO

a) C is reductant

b) PbO is oxidised

c) PbO is oxidant

d) Both (a) and (c)

Answer: (d)

In this carbon reduces PbO to Pb so carbon (C) is reducing agent (reductant) PbO acts as oxidising agent (oxidant) as it oxidises C to CO.

Question : 5

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

Answer: (a)

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