Beautiful, lake colours are formed by dyes with mordants, which paste the dye to the cloth or fabric. Which of the following is a mordar used in dying?

Calcium carbonate

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Aluminium sulphate

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Calcium hydroxide

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Zinc phosphate

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Solution

The correct option is A Calcium carbonate
$C a C O_{3}$ is used as a mordar in dying. Mordar is a dye fixture used to set dyes on fabrics by forming a coordination complex with the dye which then attaches to the fabric.

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