Which of the following is a soap?
(a) Sodium alkyl sulphonate
(b) Sodium sulphate
(c) Sodium sulphonate
(d) Sodium stearate
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Explanation:
Soaps are the sodium or potassium salt of higher fatty acids, e.g. C17H35COOK (potassium stearate). These are obtained by alkaline hydrolysis of oils and fats. The reaction is called saponificaiton.
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Sodium stearate is your answer .
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