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When `SO_2` is passed through acidified `K_2Cr_2O_7` solution

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When `SO_2` is passed through acidified `K_2Cr_2O_7` solution
A. the solution turns blue
B. the solution is discolourised
C. `SO_2` is reduced
D. green `Cr_2(SO_4)_3` is formed
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Correct Answer - D
`K_2Cr_2O_7 + H_2SO_4 + 3SO_4 to K_2SO_4 + underset"Green"(Cr_2(SO_4)_3) + H_2O`
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