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Q.

For a photochemical dimerization of a substance A the following rate law is obtained.
$\frac{d [A_{2}]}{d t} = \frac{k_{1} k_{3} I [A]}{k_{2} + k_{4} [A]}$
If it is known that the reaction is obeying zero order kinetics then what will be the value of rate of appearance of the dimer?

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a

$k_{1} k_{3} I$

b

$\frac{k_{1} k_{3}}{k_{4}}$

c

I

d

$\frac{k_{1} k_{3} I}{k_{4}}$

answer is C.

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Detailed Solution

For reaction to follow zero order kinetics:

$k_{2} + k_{4} [A] \approx K_{4} [A]$

or $r = \frac{k_{1} k_{3} I}{k_{4}} \cdot [A]^{0}$

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For a photochemical dimerization of a substance A the following rate law is obtained.dA2dt=k1k3I[A]k2+k4[A]If it is known that the reaction is obeying zero order kinetics then what will be the value of rate of appearance of the dimer?