Hardening of leather in tanning industry is based on:

Electrophoresis

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Electro-osmosis

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Mutual coagulation

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Persistent dialysis

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Solution

The correct option is D Mutual coagulation
Tanin, the chemical used in process contains a negatively charged colloidal particle whereas leather has a positively charged colloidal particle.

When the leather is soaked in tannin, due to the difference in charges, coagulation occurs.

This coagulation leads to the hardening of the leather after tanning process.

Hence, option C is correct.

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Chromium compound widely used in the tanning of leather is:

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