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Assertion:- Animal skins are colloidal in nature
Reason:- Animal skin has positively charged particles.
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Assertion is true. Reason is true but Reason is not the correct explanation for Assertion
The sol particles acquire positive or negative charge by preferential adsorption of positive or negative ions. Animal hides are colloidal in nature. When a hide, which has positively charged particles, is soaked in tannin, 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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