Fill in the following blanks:
(a) Common salt is obtained from sea-water by the process of.............
(b) Rock salt is mined just like ......................
(c) Chemical formula of washing soda is ..................
(d) Sodium hydrogen carbonate is .................. soda whereas sodium carbonate is ................. soda.
(e) The chemical formula of plaster of Paris is ............

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Solution

(a) Common salt is obtained from sea-water by the process of evaporation.
(b) Rock salt is mined just like coal.
(c) Chemical formula of washing soda is Na₂CO₃.10H₂O.
(d) Sodium hydrogen carbonate is baking soda whereas sodium carbonate is washing soda.
(e) The chemical formula of plaster of Paris is CaSO₄.1/2H₂O.

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N a_{2} C O_{3} .10 H_{2} O

Column (I)	Column (II)
(1) Bleaching powder	(a) Sodium bicarbonate
(2) Baking soda	(b) Sodium carbonate
(3) Washing soda	(c) Calcium oxychloride
(4) Plaster of Paris	(d) Calcium sulphate hemihydrate

(a) Describe how washing soda is produced starting from sodium chloride (common salt). Write equations of all the reactions involved.

(b) State whether an aqueous solution of washing soda is acidic or alkaline ? Give reason for your answer.

(d) Give two important uses of washing soda (or sodium carbonate).

What is the chemical formula of (a) baking soda, and (b) washing soda ?

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