MCQ
Hardening of leather in tanning industry is based on:
- AElectrophoresis.
- BElectro$-$osmosis.
- ✓Mutual coagulation.
- DTyndall effect.
✓
Answer
Correct option: C.
Mutual coagulation.
- The chemical used in process of tanning is known as Tannin.
- It contains negatively charged colloidal particles whereas leather contains positively charged colloidal particles.
- When the leather is soaked in tannin, due to the difference in charges, mutual coagulation occurs.
- This coagulation results in the hardening of the leather after tanning process.
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