General Science 8th Class Chapter 7 Acids, Bases and Salts Solved Exercise

General Science

8th Class

Chapter 7

Acids, Bases and Salts

Questions

1. Encircle the correct option.

(i) The king of chemicals is:

a. KOH        b. HCl        c. H₂SO₄        d. NaCl

(ii) Sodium hydroxide solution in water will:

a. turn blue litmus red

b. give pink colour with phenolphthalein

c. give red colour with methyl orange

d. not affect the phenolphthalein indicator

(iii) When carbon dioxide gas is passed through lime water, the milkiness is due to the compound:

a. Ca(HCO₃)₂        b. CaCO₃        c. H₂CO₃        d. CaO

(iv) Lactic acid is found in:

a. grapes        b. tomatoes        c. ant's string        d. yogurt

(v) Sodium carbonate is an important salt used for many purposes in industries. Which acid is reacted with sodium hydroxide to get it?

a. Oxalic acid        b. Citric acid        c. Carbonic acid        d. Acetic acid