Question

Consider the following and choose the correct answer:
Assertion [A]: Dye uptake increase with more quantity dye availability.
Reason [R]: In lower liquors for a given Dye, % mobility of dye molecules are high.

• A. [A] is true, but [R] is false
• B. Both [A] and [R] are true
• C. [A] is false, but [R] is true
• D. Both [A] and [R] are false

Hint:

Lower liquor ratio improves dye exhaustion efficiency.

Answer 1

The Correct Option is A

Concept: Dye uptake depends on dye concentration, liquor ratio, diffusion rate, and fibre affinity. However, increase in dye availability does not always directly increase dye uptake due to equilibrium and saturation limits.

Step 1: Analyze Assertion [A].

• Dye uptake depends on affinity and diffusion equilibrium
• Simply increasing dye quantity does not guarantee higher uptake So, Assertion [A] is not universally true.

Step 2: Analyze Reason [R].

• Lower liquor ratio increases dye concentration
• Higher concentration increases molecular mobility and collision frequency So Reason [R] is true.

Step 3: Final evaluation.

• [A] is false
• [R] is true \[ \boxed{\text{Option (C)}} \]