Question

Assertion (A): Animal skins are colloidal in nature
Reason (R): Animal skin has positively charged particles.

• A. Both (A) and (R) are correct and (R) is the correct explanation of (A)
• B. Both (A) and (R) are correct and (R) is not the correct explanation of (A)
• C. (A) is correct but (R) is incorrect
• D. (A) is incorrect but (R) is correct

Hint:

Colloidal nature depends on particle size and dispersion, whereas charge on colloidal particles mainly affects stability and coagulation.

Answer 1

The Correct Option is B

Step 1: Analyze the Assertion (A).
Animal skin mainly contains proteins such as collagen.
Proteins are macromolecules that exist in the colloidal state when dispersed in suitable media.
Therefore, animal skins exhibit colloidal nature.
Hence, the Assertion (A) is correct.

Step 2: Analyze the Reason (R).
Animal skin particles can acquire positive charge under certain conditions due to adsorption of ions.
In tanning and colloidal chemistry, animal hide particles are often considered positively charged colloidal particles.
Thus, the Reason (R) is also correct.

Step 3: Check whether the Reason explains the Assertion.
The colloidal nature of animal skin is due to the presence of large protein molecules dispersed as colloidal particles.
It is not because the particles are positively charged.
Charge on colloidal particles only affects stability and coagulation behavior, not the existence of the colloidal state itself.
Therefore, although both Assertion and Reason are true, the Reason is not the correct explanation of the Assertion.

Step 4: Select the correct option.
Hence, the correct option is:
\[ (2)\;\text{Both (A) and (R) are correct and (R) is not the correct explanation of (A)} \]

Step 5: Final conclusion.
Therefore, the correct answer is:
\[ \boxed{\text{Both (A) and (R) are correct and (R) is not the correct explanation of (A)}} \]