Question

For a reaction $X\to Y$, the graph of the product concentration $(x)$ versus time $(t)$ came out to be a straight line passing through the origin. Hence the graph of $\frac{-d\left[X\right]}{dt}$ and time would be

• A. straight line with a negative slope and an intercept on y-axis
• B. straight line with a positive slope and an intercept on y-axis
• C. a straight line parallel to x-axis
• D. a hyperbola

Answer 1

Answer: (C)

If product concentration is x.

For a zero order reaction $\frac{x}{t}=k$


Thus graph would be a straight line passing through origin. So the given information is for zero order reaction. For a zero order reaction, rate of the reaction is constant. Thus, plot of rate vs time, i.e., $-\frac{d\left[X\right]}{dt}$ vs time will be a straight line parallel to x-axis.