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Question

The colour of the residue whenPbO2 decomposes toPbOandO2


A

Pink

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B

Yellow

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C

Green

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D

White

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Solution

The correct option is B

Yellow


Explanation for Correct option

Option (B) Yellow

  • Lead oxide is a compound which is insoluble in water or dark alcohol. The reaction take place as follows :
  • PbO2(s)PbO(s)+O2(g)
  • Here, the oxygen gas is evolved in the reaction.
  • The colour of the residue PbO is yellow.
  • Hence option B is the answer.

Explanation for incorrect option :

Option (A) Pink.

  • Lead oxide does not absorb pink colour radiation.
  • Thus it is incorrect.

Option (C) Green

  • .Lead oxide absorb in lower frequency such as yellow.
  • Thus this is incorrect.

Option (D) White :

  • There is a colour shown by-products Lead oxide.
  • Thus this option is incorrect.

Hence The colour of the residue is yellow.


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