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Hardness of Water and Treatment

Which of the ...

Question

Which of the following statements is false about a soap?

A

The soap solution in water is neutral that can be used to wash all kinds of fabrics.

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B

Soap forms lather only in soft water.

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C

Soap is a metallic salt of higher fatty acids.

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D

Soap cannot be used in slightly acidic medium.

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Solution

The correct option is A The soap solution in water is neutral that can be used to wash all kinds of fabrics.
The soap solution in water is alkaline and cannot be used to wash all kinds of fabrics.
Fabrics that are sensitive to alkali cannot be washed with soap solution. They need dry cleaning.

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Similar questions

Q. Consider the following two statements about soap and detergent –
(i) Soaps and detergents are salts of long chain fatty acids.
(ii) Both soap and detergent precipitate scum in hard water.
(iii) Soap is sodium or potassium salt of fatty acids whereas detergents are ammoniuma nd sulphonate salts of fatty acids.
Which of the above statements is (are) true?

Q. Hard soap is a salt whereas soft soap is a salt of fatty acids.

Q. Consider the following two statements about soap and detergent –
(i) Soap is natural while detergent is a synthetic product.
(ii) Both soap and detergent precipitate scum in hard water
(iii) Soap is sodium or potassium salt of fatty acids
Which of the above statements is (are) true?

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. Fill appropriate terms in the blanks .
( white cement , soap, detergent , wearing of bones, tooth decay, hard, soft, Portland, fatty acid )

(a) The substance that helps water to remove dirt from the surface of materials is called ............... .

(b) Fluoride is used in toothpaste to prevent ................ .

(c) Soap is a salt of ............... and sodium hydroxide.

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(e) For construction purposes ............... cement is the most commonly used cement.

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