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Red hot carbon will remove oxygen from the oxides XO and YO but not from ZO. Y will remove oxygen from XO. Use this evidence to reduce the order of activity of the 3 metals X, Y, Z putting the most reactive first

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Z, Y, X

X, Y, Z

Y, X, Z

Z, X, Y

answer is B.

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Detailed Solution

Z is more reactive than X & Y because carbon cannot reduce if. Y will remove oxygen from XO. So the reactivity of metals is Z, Y, X.

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