Sulphuric acid is called King of Chemicals because it is used in the preparation of many other compounds.

Common Salt (NaCl) :
It is used in our daily food and used as a preservative.
Washing Soda (Sodium Carbonate - Na₂CO₃) :
(i) It is used in softening hard water.
(ii) It is used in glass, soap and paper industries.
Baking Soda (Sodium bicarbonate -NaHCO₃) :
(i) It is used in making of baking powder which is a mixture of baking soda and tartaric acid.
(ii) It is used in soda-acid fire extinguishers.
(iii) Baking powder is used to make cakes and bread, soft and spongy.
(iv) It neutralizes excess acid in the stomach and provides relief.
Bleaching powder (Calcium Oxychloride - CaOCI₂) :
(i) It is used as disinfectant.
(ii) It is used in textile industry for bleaching cotton and linen.
Plaster of Paris (Calcium Sulphate Hemihydrate - CaSO₄ .1/2 H₂O) :
(i) It is used for plastering bones
(ii) It is used for making casts for statues.

(i) Sodium hydroxide is used in the manufacture of soap.
(ii) Calcium hydroxide is used in white washing of building.
(iii) Magnesium hydroxide is used as a medicine for stomach disorder.
(iv) Ammonium hydroxide is used to remove grease stains from cloths.

Plaster of paris should be stored in a moisture-proof container as it absorbs water from moisture present in air and turn into hard substance (Gypsum).

Distilled water can not conduct electricity. Because it does not contain ions whereas rain water conducts electricity as it contains ions due to presence of dissolved salt in it.