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Question

Which of the following anion is present in compound A when warmed with dilute sulphuric acid gives a colourless gas which turns acidified potassium dichromate solution green.


  1. SO42-

  2. S2-

  3. SO32-

  4. None of these


Solution

The correct option is C

SO32-


Sodium sulphite warmed with dilute sulphuric acid to give sodium chloride, water and sulphur dioxide gas. So, sodium sulphite contains SO32 ion.

Na2SO3+H2SO4Na2SO4+H2O+SO2

 Sulphur dioxide gas is colourless with a smell of burning sulphur. Sulphur dioxide changes orange/yellow solution of acidified potassium dichromate green.

K2Cr2O7Orange+H2SO4+3SO2Cr2(SO4)3Green+K2SO4+H2O
 

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