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Question

For the decomposition of HI at 1000 K (2HIH2+I2), the following data were obtained:

[HI](M)Rate of decomposition of HI(mol L1s1)
0.1 2.75×108
0.2 11×108
0.3 24.75×108
The order of reaction is:

A
1
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B
2
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C
0
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D
1.5
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Solution

The correct option is B 2
Rate =k[HI]n
11×108=k[0.2]n ...(i)
2.75×108=k[0.1]n ....(ii)
Dividing equation (i) by equation (ii),
4=2n,n=2

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