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For the conversion of X to Y following second order kinetics with rate = k[X]^2, if [X] is increased to three times, by what factor does the rate of formation of Y change?
A3 times
B6 times
C9 times
D27 times
Answer & Solution
Correct answer: C. 9 times
1. Rate $= k[X]^2$.
2. New rate $= k(3[X])^2 = 9k[X]^2$.
3. So the rate increases by a factor of $3^2 = 9$.
4. Distractor A treats it as first order; distractor D treats it as third order.
_Source: NCERT Class 12 Chemistry Ch 3 "Chemical Kinetics", p.10_
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