NEET Chemistry Chemical Kinetics Questions Solved

NEET - 2017

Mechanism of a hypothetical reaction

X2 + Y2            2XY is given below

(i) X2            X + X fast

(ii) X + Y2            XY + Y (slow)

(iii) X + Y           XY fast

The overall order of the reaction will be

(a) 1

(b) 2

(c) 0

(d) 1.5

(d) We know that, slowest step is the rate determining step.

 Rater(r) = K1[X2][Y2]                            ......(i)

Now, from equation. (i), I.e.

        X2            2X(fast)Keq = X2X2  X = KeqX212       .....(ii)

Now, substitute the value of[X] from equation. (ii) in equation. (i), we get

                Rate(r) = K1(Keq)12[X2]12[Y2]                             = K[X2]12[Y2] Order of reaction = 12+1=32=1.5

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