Question

Assertion: Hard water is unsuitable for laundry.
Reason: soap reacts with hard water to form Ca /Mg stearate which is precipitated as scum.​

Answer 1

Answer:

both "A" and "R" are correct and "R" is correct explanation of "A"

Explanation:

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Answer 2

Answer:

Both the statements( assertion and reason) are true and the reason is the correct explanation for the assertion.

Explanation:

Hard water is water that has high mineral salts such as calcium and magnesium carbonates, bicarbonates, and sulfates.

Soap is made up of fatty acids like sodium or potassium stearate, that is sodium or potassium salt of stearic acid.

When the calcium and magnesium salts of hard water react with sodium or potassium stearate, $Ca/Mg$ stearate is precipitated as scum. So that hard water is unsuitable for laundry.