Question

Assertion :For zero order reaction the rate of reaction does not decrease with time. Reason: For zero order reaction amount of substance reacted is proportional to time.

• A. Both (A) and (R) are true (R) is the correct explanation to (A)
• B. Both (A) and (R) are true but (R) is not the correct explanation to (A)
• C. (A) is true but (R) is false
• D. Both (A) and (R) are false

Answer 1

The correct option is B Both (A) and (R) are true but (R) is not the correct explanation to (A)

For zero order reaction $rate=k[A{]}^0$.

So, rate of the reaction is independent of the concentration of the reactants hence it is constant at any time.

Integrated rate law for zero order reaction is $A_t=A_0-kt$.

So, for zero-order reaction amount of substance reacted is proportional to time.