Alum is used by dyer for :

Chemistry S and P - Block Elements (S - Block Elements Not In Syllabus ) Halogens and their Compounds Single Correct MCQ

Published by: CGP EDU Academic Team

Published on: August 13, 2026

For fire-proofing fabrics

As first aid for cuts

For softening hard water

As mordant

Text Solution

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The correct answer is:

As a mordant in dye industry. The fabric which is to be dyed is dipped in a solution of the alum and

heated with steam. Al(OH)3 obtained as hydrolysis product of [Al(H2O)6]3+ deposits into the fibres and then the dye is absorbed on Al(OH)3.

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