JAMB Chemistry 2020 Objective — Question 15

Question 15 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2020 Objective paper, with the correct answer and a full explanation.

15. 2X(g) + Y(g) -> Z(g). The rate of formation of Z is found to double when the concentration of Y is doubled and to quadruple when the concentration of X is doubled. Determine an expression for the rate of the reaction

A. A. R=K[X][Y]
B. B. R=K[X][Y]^2
C. C. R=K[X]^2[Y]Correct
D. D. R=K[X]^4[Y]^2

Explanation

Rate doubles when [Y] doubles → first order in Y. Rate quadruples when [X] doubles → second order in X (2^2=4). So rate = K[X]^2[Y].

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