For the decomposition of HI at 1000 K (2HI $\to H_{2} + I_{2}$ ), the following data were obtained
[HI], M Rate of decomposition of HI (mol $L^{- 1} s^{- 1}$ )
0.1 $2.75 \times 10^{- 8}$
0.2 $11 \times 10^{- 8}$
0.3 $24.75 \times 10^{- 8}$
The order of reaction is:

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1.5

answer is B.

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Detailed Solution

Rate $= k {[H I]}^{n}$
$11 \times 10^{- 8} = k {[0.2]}^{n}$ ….(i)
$2.75 \times 10^{- 8} = k {[0.1]}^{n}$ ….(ii)
Dividing eq. (i) by eq. (ii), $4 = 2^{n}, n = 2$

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