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Question

23) Which among the following is a detergent.


A

sodium stearate

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B

sodium chloride

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C

sodium carbonate

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D

sodium lauryl sulfate

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Solution

The correct option is D

sodium lauryl sulfate


Explanation for the correct option -

(D) Sodium lauryl sulfate represented by the molecular formula CH3(CH2)11OSO3Na is a detergent and has the ability to form lather or scum with hard water.

Explanation for the incorrect option -

(A) Sodium stearate is made up of a long chain of carbon (35 carbon atoms) and does not form lather with hard water , hence it is a soap.

(B) Sodium chloride represented by NaCl is the common salt.

(C ) Sodium carbonate represented by Na2CO3 is also known as washing soda. It forms carbonic acid when dissolved in water.

Hence, the correct option is (D).


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