Question

Determine the correctness or otherwise of the following Assertion [a] and Reason [r]
Assertion: Nylon is dyed with acid dyes in the acidic medium.
Reason: Nylon assumes positive charge in the acidic medium and thus attracts the negatively charged acid dye molecules.

• A. Both [a] and [r] are true and [r] is the correct reason for [a]
• B. Both [a] and [r] are true and [r] is not the correct reason for [a]
• C. Both [a] and [r] are false
• D. [a] is true but [r] is false

Hint:

When dyeing nylon with acid dyes, the acidic medium helps in the formation of a positive charge on the nylon, which attracts the negatively charged acid dyes.

Answer 1

The Correct Option is A

Nylon is indeed dyed with acid dyes in an acidic medium. The reason for this is that in an acidic medium, nylon becomes positively charged, which allows it to attract the negatively charged acid dye molecules. This interaction is what facilitates the dyeing process. Hence, both the assertion and the reason are true, and the reason correctly explains the assertion. Thus, the correct answer is (A).
Final Answer: \[ \boxed{(A) \, \text{Both} \, [a] \, \text{and} \, [r] \, \text{are true and} \, [r] \, \text{is the correct reason for} \, [a].} \]