Home Chemistry Surface Chemistry Adsorption and Adsorption Isotherm Softening of hard water is done using sodium…
Chemistry Surface Chemistry Adsorption and Adsorption Isotherm Single Correct MCQ
Published on: August 12, 2026

Softening of hard water is done using sodium aluminium silicate (zeolite). This causes:

A
adsorption of Ca 2+ and Mg 2+ ions of hard water replacing Na + ions. and
B
adsorption of Ca 2+ and Mg 2+ ions of hard water replacing Al 3+ ions
C
both
D
none of these

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Verified by Experts
The correct answer is:
A

Softening of hard water : Ion exchange resins used for softening of hard water is based upon selective and competitive adsorption of ions on resins.

Na 2 Z + Ca +2 ⎯→ CaZ + 2 Na + The organic polymers containing groups like –COOH, –SO 3 H and –NH 2 etc. possess the property of selective adsorption of ions from solution. These are quite useful in the softening of water.

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