Alum in dyeing of clothes is used as

Options

(a) bleaching agent
(b) fire proof material
(c) mordant of colour
(d) diluent

Correct Answer:

mordant of colour

Explanation:

Alums are the double salts of the formula X₂SO₄. Y₂(SO₄)₃. 24H₂O where X represents a monovalent cation such as Na⁺, K⁺ and NH₄⁺ while Y is a trivalent cation such as Al³⁺ , Cr³⁺ and Fe³⁺. these alums are used as mordant by dyers of clothes for fixing the dye.