When SO2 gas is passed through acidified...

When `SO_2` gas is passed through acidified `K_2Cr_2O_7` solution, the colour of the solution changes to

Red

Black

Orange

Green

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The correct Answer is:

When `SO_2` is passed through acidified `K_2Cr_2O_7` solution, the orange colour of the solution changes to green due to formation of chromic sulphate.
`K_2Cr_2O_7+3SO_2 + H_2SO_4 rarr K_2SO_4 + Cr_2(SO_4)_2 +7H_2O +3S`

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