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Q.

During the qualitative analysis of SO32−  using dilute H2SO4,SO2 gas is evolved which turns K2Cr2O7 solution(acidified with dilute H2SO4 ):

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a

Blue

b

Red

c

Green

d

Black

answer is B.

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Detailed Solution

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Cr2O7−2+2SO3−2+8H+→2Cr+3+2SO4−2+4H2O

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