Question

Assertion (A): Hard water forms sticky precipitate with soap.
Reason (R): Hard water contains calcium and magnesium ions

• A. Both A and R are true and R is a correct explanation of A
• B. Both A and R are true but R is not a correct explanation of A
• C. A is true but R is false
• D. A is false but R is true

Answer 1

The correct option is A Both A and R are true and R is a correct explanation of A

Hard water contains calcium and magnesium ions which forms insoluble precipitate with soap which are sticky in nature

$\underset{Soap}{2\underset{}{C_{17}{H}_{35}COONa}}+CaC{l}_2\to +2NaCl+\underset{Isoluablepercipitate}{\underset{}{(C_{17}{H}_{35}COO{)}_{2}Ca}}$