Question:
Given below are two statements:
Statement I: Animal skin is positively charged and tannin is negatively charged.
Statement II: In leather tanning, chromium salts are used in place of tannin.
Given below are two statements:
Statement I: Animal skin is positively charged and tannin is negatively charged.
Statement II: In leather tanning, chromium salts are used in place of tannin.
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Leather tanning is a classic example of mutual coagulation of oppositely charged colloids.
Animal Skin (+)
Tannin (-)
Modern industry often replaces tannin with chromium salts.
Updated On: Jun 10, 2026
- Both Statements I and II are correct
- Both Statements I and II are not correct
- Statement I is correct but Statement II is not correct
- Statement I is not correct but Statement II is correct
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The Correct Option is A
Solution and Explanation
Concept:
Leather tanning is an important industrial application of colloids and adsorption.
Animal skin contains protein molecules and behaves as a positively charged colloidal system under tanning conditions.
Tannin, obtained from plant extracts, behaves as a negatively charged colloid.
Because oppositely charged colloids attract one another, tannin gets adsorbed on the animal skin and converts it into leather.
Modern tanning industries also use chromium salts because they produce better quality leather and reduce processing time.
Step 1: Analyse Statement I Statement I says: Animal skin is positively charged and Tannin is negatively charged Since coagulation occurs due to attraction between oppositely charged colloids, this statement is scientifically correct. Hence, \[ \boxed{\text{Statement I is correct}} \]
Step 2: Analyse Statement II Modern leather industries commonly use chromium(III) salts. These salts replace tannin in many commercial tanning processes because:
• Faster tanning.
• Better durability.
• Improved leather quality.
• Greater industrial efficiency.
Hence, \[ \boxed{\text{Statement II is correct}} \]
Step 3: Determine the final answer Since both statements are true, \[ \boxed{\text{Both Statements I and II are correct}} \] Therefore, \[ \boxed{\text{Option (A)}} \]
Step 1: Analyse Statement I Statement I says: Animal skin is positively charged and Tannin is negatively charged Since coagulation occurs due to attraction between oppositely charged colloids, this statement is scientifically correct. Hence, \[ \boxed{\text{Statement I is correct}} \]
Step 2: Analyse Statement II Modern leather industries commonly use chromium(III) salts. These salts replace tannin in many commercial tanning processes because:
• Faster tanning.
• Better durability.
• Improved leather quality.
• Greater industrial efficiency.
Hence, \[ \boxed{\text{Statement II is correct}} \]
Step 3: Determine the final answer Since both statements are true, \[ \boxed{\text{Both Statements I and II are correct}} \] Therefore, \[ \boxed{\text{Option (A)}} \]
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