Question 71997ChemistryWAEC

From the following equations, what is the order of decreasing reactivity of X\text{X}, Y\text{Y}, and Z\text{Z}?

Y(s)+X2+(aq)→Y2+(aq)+X(s)\text{Y}(s) + \text{X}^{2+}(aq) \rightarrow \text{Y}^{2+}(aq) + \text{X}(s) X(s)+Z2+(aq)→X2+(aq)+Z(s)\text{X}(s) + \text{Z}^{2+}(aq) \rightarrow \text{X}^{2+}(aq) + \text{Z}(s)
A

X>Y>Z\text{X} > \text{Y} > \text{Z}

B

Y>X>Z\text{Y} > \text{X} > \text{Z}

C

Z>Y>X\text{Z} > \text{Y} > \text{X}

D

Y>Z>X\text{Y} > \text{Z} > \text{X}

Step-by-Step Explanation

Reactivity in this context is determined by the ability of a substance to displace another from its compound. In the first reaction, Y displaces X from its ionic form, indicating that Y is more reactive than X. In the second reaction, X displaces Z, showing that X is more reactive than Z, leading to the order of reactivity as Y > X > Z.

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