| A hypothetical reaction: |
| \[{{A}_{2}}+{{B}_{2}}\xrightarrow{{}}\,2AB\]Follows mechanism as given below: |
| \[{{A}_{2}}A+A.........(\text{fast})\] |
| \[A+{{B}_{2}}AB+B.........(slow)\] |
| \[A+BAB.........(\text{fast})\] |
| The order of overall reaction is: |
A) 2.5
B) 1
C) 3 / 2
D) Zero
Correct Answer: C
Solution :
| Rate is governed by slowest step | ||
| \[A+{{B}_{2}}AB+B\] | ||
| \[r={{k}_{1}}\,[A]\,\,[{{B}_{2}}]\] | ?(i) | |
| Form \[{{A}_{2}}A+A\] | ||
| \[{{k}_{C}}=\frac{{{[A]}^{2}}}{[{{A}_{2}}]}\] | ?(ii) | |
| \[[A]=\sqrt{{{k}_{c}}}{{[{{A}_{2}}]}^{1/2}}\] | ||
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