A) [A] only
B) [C] only
C) [A] and [B] only
D) [B] and [C] only
Correct Answer: A
Solution :
[a] Rate of a first order reaction, \[r=k\,[A]\] \[=\frac{change\text{ }in\text{ }concentratiofA\text{ }of\text{ }reaction}{dt}\] Thus, rate changes with time. [b] Rate constant depends only upon the temperature. [C] Half-life for first order reaction is, \[{{t}_{1/2}}=\frac{0.693}{k}\]ie, it also does not vary with time.
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