Question

For a reaction $X\to Y$, the graph of the product concentration $\left(x\right)$ versus time $\left(t\right)$ came out to be 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 interept on y-axis
• B. straight line with positive slope and an interecept on y-axis
• C. a straight line parallel to x-axis
• D. a hyperbola

Answer 1

The correct option is C a straight line parallel to x-axis

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