p-Block elementsHard

Question

Alum is used by dyer for :

Options

A.for fire-proofing fabrics
B.as first aid for cuts
C.for softening hard water
D.as mordant

Solution

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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