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Question

The following can convert hard water into soft water :
  1. HCl
  2. H2O2
  3. Sodium aluminium silicate
  4. Lead nitrate

A
HCl
B
Lead nitrate
C
Sodium aluminium silicate
D
H2O2
Solution
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The correct option is D Sodium aluminium silicate
The hardness of water is due to carbonate or sulphate of Ca2+ and Mg2+ ions. When sodium aluminum silicate is added Na+ replaces Ca2+ and Mg2+ by adsorption, and hence water becomes soft.

Hence the correct answer is option (D)

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