Which of the following items are not bleached by bleaching powder?

Straw

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Silk

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Ivory

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None of the above

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Solution

The correct options are
A Ivory
C Straw
D Silk
Straw, Silk and Ivory are not bleached by bleaching powder.
Bleaching action is possible on cotton in the textile industry, wood pulp in paper factories and washed clothes in laundry.

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