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WAEC - Chemistry (1997 - No. 18)

From the following equations, what is the order of decreasing reactivity of X, Y and Z? Y (s) + X2+(aq) → Y2+(aq) + X(s) X(s) + Z2+(aq) → X2+(aq) + Z(s)
X>Y>Z
Y > X > Z
Z > Y > X
Y > Z > X
X > Z > Y

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