acids, bases, salts and metals - Category wise Question and Answer Practice Test with Solutions

Question : 11

Plaster of Paris hardens by –

a) changing into CaCO₃

b) combining with water

c) giving of CO₂

d) giving out water

Question : 12

The chemical name of bleaching powder is

a) calcium oxychloride

b) calcium chloroxide

c) calcium chloride

d) none of above

Question : 13 [NDA]

Which one of the following salts when dissolved in water makes the solution basic?

a) Ferric chloride

b) Sodium chloride

c) Copper sulphate

d) Sodium acetate

Question : 14 [BPSC (Pre) 1994]

The chemical formula of washing soda is

a) Na₂CO₃

b) NaHCO₃

c) NaOH

d) Ca(OH)₂

Question : 15

To protect tooth decay we are advised to brush our teeth regularly. The nature of the tooth paste commonly used is

a) neutral

b) basic

c) acidic

d) corrosive