(a) Name a sodium compound used for softening hard water.
(b) Which compound of calcium is used for disinfecting drinking water supply?
(c) Name a metal compound which has detergent properties (cleansing properties).
(d) Name one compound of calcium which is used for removing the colour of a coloured cloth.
(e) State a peculiar (or remarkable) property of plaster of paris.
(f) Name the substance obtained by the action of chlorine on solid (dry) slaked lime.

Explanation

(a) Sodium carbonate
(b) Bleaching powder
(c) Sodium carbonate
(d) Bleching powder
(e) It sets into a hard mass on mixing with a proper quantity of water.
(f) Beaching powder