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Which of the following can be used in place of tannin for the process of tanning?

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in Chemistry – Class 12 by (188k points)
Which of the following can be used in place of tannin for the process of tanning?

(a) Zinc salts

(b) Copper salts

(c) Chromium salts

(d) Cobalt salts

This question was addressed to me during a job interview.

My question is based upon Surface Chemistry topic in section Surface Chemistry of Chemistry – Class 12

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The correct option is (c) Chromium salts

The best I can explain: Tannin, obtained from plants, is a mixture of polyhydroxy benzoic acids. It contains negatively charged colloidal particles which make it useful for tanning as animal hides contain positively charged colloidal particles. Chromium salts can be used in place of tannin.

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