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Red hot carbon will remove oxygen from the oxides XO and YO not from ZO. Y will remove oxygen from XO. Use this evidence to deduce the order of activity of the three metals X, Y and Z putting the most reactive first
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The correct answer is:
Z, Y, X
Carbon does not reduce ZO and thus, is more reactive. Also Y removes oxygen from XO and thus, Y is more active than X. Thus, activity order is Z, Y, X.
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