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Q.

Which of the following are true about tanning?

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a

Tanning results in the hardening of leather

b

In process of tanning, a hide is soaked in tannin

c

Any salts can be used in the place of tannin

d

Chromium salts are used in place of tannin

answer is A.

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Detailed Solution

Animal hides are colloidal in nature. A hide positively charged particles is soaked in tanning, which contains negatively charged colloidal particles, mutual coagulation takes place. This results in the hardening of leather. This process is termed as tanning.
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