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

Question : 11

Rusting of an iron is an example of

a) oxidation

b) reduction

c) ionization

d) dissociation

Question : 12

Which one of the following is not an exothermic reaction ?

a) Burning of a candle

b) Respiration

c) Slaking of lime

d) Dipping of iron block in water

Question : 13

A molal solution is one that contains 1 mole of a solute in

a) one litre of the solution

b) one litre of the solvent

c) 1000 g of the solvent

d) 22.4 litres of the solution

Question : 14

The reactions in which two compounds exchange their radicals to form two new compounds are called

a) double displacement reaction

b) displacement reaction

c) decomposition reaction

d) isomerisation reaction

Question : 15

Which of the following involves combination of two elements?

a) 2SO₂ + O₂ ⟶ 2SO₃

b) CaO + CO₂ ⟶ CaCO₃

c) 4Na + O₂ ⟶ 2Na₂O

d) NH₃ + HCl ⟶ NH₄Cl