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Q.

Which of the following reactions is possible?

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a

Heating zinc oxide with magnesium or copper

b

Heating copper oxide with zinc or magnesium

c

Both 1 & 2

d

None of these

answer is B.

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Detailed Solution

Heating copper oxide with zinc or magnesium is a possible reaction.
When zinc oxide is heated with magnesium or copper, it displaces magnesium but copper is not displaced because copper is less reactive than magnesium.
When copper oxide is heated with zinc or magnesium, copper gets displaced by both zinc and magnesium because both metals are more reactive than copper. The said reactions are represented as:

Zn + CuS O_{4} \to Cu + ZnS O_{4}

Mg + CuS O_{4} \to Mg {SO}_{4} + Cu

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