During the qualitative analysis of SO _ 3 ^ 2 - using dilute H _ 2 SO _ 4 , SO _ 2 gas is evolved which turns K _ 2 Cr _ 2 O _ 7 solution (acidified with dilute H _ 2 SO _ 4 ):

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Correct answer: C. Green

On treating sulphite ( SO _ 3 ^ 2 - ) with warm dilute H _ 2 SO _ 4 , SO _ 2 gas is evolved which is suffocating with the smell of burning sulphur. Na _ 2 SO _ 3 + H _ 2 SO _ 4 → Na _ 2 SO _ 4 + H _ 2 O + SO _ 2 The gas turns potassium dichromate paper acidified with dil. H _ 2 SO _ 4 , green. K _ 2 Cr _ 2 O _ 7 + H _ 2 SO _ 4 + 3 SO _ 2 → K _ 2 SO _ 4 + Cr _ 2 ( SO _ 4 ) _ 3 + H _ 2 O

During the qualitative analysis of SO _ 3 ^ 2 - using dilute H _ 2...

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