Q16 / 160 · TS EAMCET 2015 · Chemistry

Which one of the following is used in the hardening of leather?

A
Light sensitive silver bromide in gelatin
B
Sodium lauryl sulphate
C
Alum
Correct answer
D
Tannin

Solution

Animal leather is colloidal in nature and has positively charged particles. When it is soaked in tannin, a negatively charged colloid, it results in mutual coagulation and gets harden. Thus, leather get hardened after tanning.

Hence, the correct answer is option: 'D'.

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