Question

Assertion (A): Detergents are more effective cleansing agents than soaps in hard water.
Reason (R): They do not form precipitates with ${\mathrm{Ca}}^{2+}$ and ${\mathrm{Mg}}^{2+}$ present in hard water.

• A. (A) is correct, (R) is wrong.
• B. (A) and (R) are correct, (R) doesn’t explain (A).
• C. (A) and (R) are correct, (R) explains the (A).
• D. (A) is wrong, (R) is correct.

Answer 1

The correct option is C (A) and (R) are correct, (R) explains the (A).

• Detergents are more effective cleansing agents than soaps in hard water because they do not form precipitates with ${\mathrm{Ca}}^{2+}$ and ${\mathrm{Mg}}^{2+}$ present in hard water.
• So, both assertion and reason are correct and reason explains the assertion.
• Therefore, the correct answer is option A.