Which of the following reaction is possible
Heating Zinc Oxide with Magnesium or Copper

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Solution

Part 1:
When we heat Zinc Oxide with Magnesium it gives Magnesium Oxide and Zinc this happened because the activity/reactivity of Zinc is low as compared to Magnesium.
$ZnO (s) + Mg (s) \overset{∆}{\to} MgO (s) + Zn (s) Zinc Magnesium Oxide Oxide$
Hence, the reaction is possible.
Part 2 :
Whereas when we heat Zinc Oxide with Copper, no reaction will take place because the activity/reactivity of Copper is low as compared to Zinc.
$ZnO (s) + Cu (s) \overset{∆}{\to} No reaction Zinc Oxide$
Hence, the reaction is not possible.

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Classify the following reactions into

(a) Direct combination

(b) Decomposition reaction

(d) Double decomposition

The reactions are - (i) Zinc hydroxide on heating gives zinc oxide and water

(ii) Zinc reacts with copper(II) sulphate to give zinc sulphate and copper

(iii) Zinc sulphate reacts with ammonium hydroxide to give ammonium sulphate and zinc hydroxide

(iv) Molten zinc at high temperatures, burns in the air to give zinc oxide.

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