If the rate of formation of B is set to be zero then the concentration of B is given by:

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Solution

Q.
For a reaction $A \overset{K_{1}}{\to} B \overset{K_{2}}{\to} C$

If the rate of formation of B is set to be zero then the concentration of B is given by: [2024]

1 $(K_{1} - K_{2}) [A]$

2 $K_{1} K_{2} [A]$

3 $(\frac{K_{1}}{K_{2}}) [A]$

4 $(K_{1} + K_{2}) [A]$

Ans.
(3)

  B is formed in the reaction, $A \overset{k_{1}}{\to} B$ . Assuming it to be a first order reaction, rate of formation of B is given by, $r_{form} (A) = K_{1} (A) .$

  B is consumed in the reaction, $B \overset{k_{2}}{\to} C$ . Assuming it to be a first order reaction, rate of consumption of B is given by, $r_{con} (B) = K_{2} (B) .$

  Since net rate of formation of B is zero.

$r_{form} (B) = r_{con} (B)$

$K_{1} [A] = K_{2} [B]$

$[B] = \frac{K_{1}}{K_{2}} [A]$

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