Question

Choose the correct option.​
Assertion (A): Hard water gives lather with soap easily. ​
Reason (R): Salts of sodium and magnesium present in hard water react with soap to form insoluble salts.

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

Answer 1

The correct option is A Both A and R are false.​

Hard water contains salts of ${Ca}^{2+}$ and ${Mg}^{2+}$ which react with soap to form salts that are insoluble in water. Consequently, hard water does not lather with soap. Therefore, both A and R are false.

The correct answer is option (d).