Ncert Exercises & Solutions

The following graph shows the concentration of reactant A versus time for a given reaction. Based on this information, which of the following statements are correct?

(A)	The reaction is zero-order with respect to A.
(B)	The rate constant k has units of mol L^-1 s^-1.
(C)	The slope of the graph is equal to +k.
(D)	The rate of the reaction is independent of the concentration of A.

Options:

1. A, B and D
2. A, B and C
3. A, C and D
4. B, C and D

Hint: If the concentration vs. time graph for A is a straight line, it indicates a zero-order reaction.

(i) For A B the given graph shows a zero-order reaction. Mathematically represented as

$[R] = - kt + {[R]}_{0}$

Which is the equation of a straight line. Hence, the reaction is a zero-order.

(ii) Slope =-k

(iii) The unit of zero-order reaction is mol L^-1 s^-1.

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