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Soaps

Assertion (A)...

Question

Assertion (A): Hard water gives easy lather with soap.
Reason (R): Salts of calcium and magnesium react with soap to form insoluble salts.

A

(A) and (R) both are correct and (R) is the correct explanation of (A).

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B

(A) and (R) both are correct but (R) is not the correct explanation of (A).

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C

(A) is correct but (R) is not correct.

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D

(A) is not correct but (R) is correct.

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Solution

The correct option is D (A) is not correct but (R) is correct.
Hard water contains dissolved chlorides, sulphates and bicarbonates of calcium or magnesium. It does not lather with soap because the salts of calcium and magnesium react with soap to form insoluble precipitate of scum.

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Similar questions

Q. Assertion :Soft water lathers with soap but not hard water Reason: Hard water reacts with soap t form insoluble salts which form scum, not lather

Q. Assertion :Scum is formed when hard water is treated with soap. Reason: Hard water contains calcium and magnesium ions. When soap comes in contact with hard water, these ions form calcium and magnesium salts of fatty acids which are insoluble in water. These calcium or magnesium salts precipitate out in the form of scum.

Q. Assertion :Synthetic detergents can lather well in hard water. Reason: Synthetic detergents form soluble calcium and magnesium salts with hard water.

Q. Assertion (A): Synthetic detergents can lather well in hard water.
Reason (R): Synthetic detergents form soluble calcium and magnesium salts with hard water.

Q. Which of the following is true regarding these statements?

Statement 1: Hard water contains dissolved salts of calcium and magnesium.
Statement 2: Hard water lathers easily with soap.

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