A) Sodium aluminium silicate is used in the softening of hard water
B) Potash alum is used in shaving rounds and as a styptic in medicine
C) Artificial rain is caused by throwing electrified sand on the clouds from an aeroplane
D) Deltas are formed at a place where the river pours its water into the sea
Correct Answer: A
Solution :
The action of sodium aluminium silicate (zeolite) on hard water is not an example of colloidal action. It is actually the simple chemical substitution of calcium salts with zeolite so that calcium zeolite precipitates out, and hardness of water removes.
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