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  4. 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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Q. 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

NTA AbhyasNTA Abhyas 2020Electrochemistry

Solution:

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.