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Question

The metal oxide is yellow when hot and white when cold.The metal oxide is


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Solution

Metal oxide:

  • A metal oxide is a crystalline solid that is composed of a metal cation and an oxide anion.
  • Metallic oxide is alkaline in nature.
  • Almost all metals combine with oxygen to form metal oxides.
  • General reaction for the formation of metal oxide:

Metal+OxygenMetaloxide

The metal oxide is yellow when hot and white when cold. The metal oxide is Zinc oxide.

Zinc oxide:

  • Zinc oxide is amphoteric in nature.
  • Zinc oxide reacts with a strong base to form zincates, when this is strongly heated it assumes a yellow color which disappears when it is cooled down.
  • The chemical reaction can be depicted as:

ZnO(aq)+2NaOH(aq)Na2ZnO2(s)+H2O(l)


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