KVPY SX SB Exam 2018 Question Paper

Question : 102 of 120

Marks: +1, -0

Consider the following reversible first-order reaction of X at an initial concentration

[X]_0

. The values of the rate constants are k

_\f

= 2s

^{–1}

and kb = 1s

^{–1}

A plot of concentration of X and Y as function of time is

Solution:

t = 0\ X_0

t = eq. X_0 -α\;\;\; α

α/{2x_0-α}=2

α = 2x_0 -2α

3α = 2x_0

α ={ 2x_0 }/3

At equilibrium

[x] =x_0/3

[y] ={2 x_0}/3

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