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

Question : 1 [NDA]

Bases turn red litmus blue and acids turn blue litmus red. A student tested a liquid with a red litmus paper and it stayed red with no change. This shows that the liquid

a) is not a base

b) must be pure water

c) must be an acid

d) is neither a base nor an acid

Question : 2 [NDA]

The concentration of hydrochloric acid in a given solution is 10_–8 M. What is the value of pH for this solution ?

a) < 7

b) 7

c) > 7 but not 14

d) 14

Question : 3

Which of the following compounds is basic in nature ?

a) CaCl₂ .6H₂O

b) NaCl

c) Ca(OH)₂

d) CuSO₄ .5H₂O

Question : 4

Which of the following statement is true?

a) Bases are sour in taste

b) The reaction between acid and a base is exothermic reaction

c) Acids are bitter in taste

d) The reaction between an acid and a base is endothermic reaction.

Question : 5

Washing soda has the formula –

a) Na₂CO₃ .10H₂O

b) Na₂CO₃ .H₂O

c) Na₂CO₃ .7H₂O

d) Na₂