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Which of the following chemical is added in washing powder for keeping it dry?

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Which of the following chemical is added in washing powder for keeping it dry?

(a) Sodium silicate

(b) Inorganic phosphate

(c) Carboxy-methyl cellulose

(d) Sodium perborate

I got this question during an interview.

I'd like to ask this question from Detergents topic in chapter Industrially Important Materials of Engineering Chemistry II

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The correct option is (a) Sodium silicate

The best explanation: Sodium silicate is added in washing powder for keeping it dry while others are used for fragrance and cleansing action.

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