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  4. An insoluble dye is reduced to a soluble colourless leuco form by an alkaline reducing agent. The fibre is soaked in the dye solution and then exposed to air to develop the colour. The dye is

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Q. An insoluble dye is reduced to a soluble colourless leuco form by an alkaline reducing agent. The fibre is soaked in the dye solution and then exposed to air to develop the colour. The dye is

KEAMKEAM 2007Chemistry in Everyday Life

Solution:

Vat dyes are insoluble in water and cannot directly applied. It is reduced to soluble colourless leuco form by an alkaline reducing agent, e.g.,

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