Chemical Kinetics Ques 40
40. Select the rate law that corresponds to data shown for the following reaction $A+B \longrightarrow$ products.
[1994]
| Exp. | $[A]$ | $[B]$ | Initial rate |
|---|---|---|---|
| 1 | 0.012 | 0.035 | 0.1 |
| 2 | 0.024 | 0.070 | 0.8 |
| 3 | 0.024 | 0.035 | 0.1 |
| 4 | 0.012 | 0.070 | 0.8 |
(a) $rate=k[B]^{3}$
(b) rate $=k[B]^{4}$
(c) rate $=k[A][B]^{3}$
(d) rate $=k[A]^{2}[B]^{2}$
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Answer:
Correct Answer: 40.(a)
Solution:
(a) From data 1 and 3, it is clear that keeping (B) const, When $[A]$ is doubled, rate remains unaffected. Hence rate is independent of $[A]$. from 1 and 4, keeping $[A]$ constant, when $[B]$ is doubled, rate become 8 times. Hence rate $\propto[B]^{3}$.
BETA
