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Question

The yellow colour of straw and wool can be removed by bleaching with a solution of:

A
iodine
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B
nitrites
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C
sulphites
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D
caustic soda
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Solution

The correct option is C sulphites
The vapour of burning sulphur is employed for removing color from whitening wool, silk, and straw. Sulphur forms sulphur dioxide (SO2) which acts on the yellow coloring matter.

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