11. Electrolysis of an aqueous solution of copper sulphate using copper electrodes gives
12. Aluminium can be purified by
13. The aqueous solution of potassium chloride is
14. Sodium is produced by the electrolysis of
15. Bleaching powder is prepared by passing :
16. Most commonly used bleaching agent is
17. The acid which is secreted by the glands in the stomach wall is
18. Hydrochloric acid is also known as
19. Heating of a ore below its melting point in the absence of air is known as
20. Stainless steel is usually made by alloying the steel with
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