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

Question : 26

A base which dissolves in water is called

a) alkali

b) acid

c) soluble base

d) oxide

Question : 27 [PSC (Pre) 2016]

Which one of the following substances is used in photography and also as an antichlor?

a) Sodium thiosulphate

b) Hydrogen peroxide

c) Chrome red

d) Calomel

Question : 28

Plaster of paris is made from –

a) slaked lime

b) quick lime

c) lime stone

d) gypsum

Question : 29

Aqueous solution of which of the following salt will change the colour of red litmus to blue?

a) Na₂CO₃ .10H₂O

b) Both (a) and (b)

c) Na₂CO₃

d) None of these

Question : 30

Which of the following is an alkali ?

a) KOH

b) Mg(OH)₂

c) Ca(OH)₂

d) CaCO₃