For a chemical reaction R → P, the variation in the concentration (R) vs. time (t) plot of solution is given as above. (i) Predict the order of the reaction. (ii) What is the slope of the curve?

(i) The variation in the concentration (R) vs. time (t) plot shown here represents a zero-order reaction, for which the rate of the reaction is proportional to zero power of the concentration of the reactants. (ii) For a zero-order reaction, the rate constant is given as [R] = [R]₀ - kt. So, the slope of the curve for the variation in the concentration (R) vs. time (t) plot is equal to the negative of the rate constant for the reaction.