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  4. Which one of the following statements is correct when SO2 is passed through acidified K2Cr2O7 solution ?

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Q. Which one of the following statements is correct when $SO_2$ is passed through acidified $K_2Cr_2O_7$ solution ?

NEETNEET 2016The d-and f-Block Elements

Solution:

Acidified $K_2Cr_2O_7$ oxidizes $SO_2$ to green colour $Cr_2(SO_4)_3$
$K_2Cr_2O_7 + 3SO_2 + H_2 SO_4 \rightarrow K_1SO_4 + \underset{\text{ green}}{Cr_2(SO_4)_3 } + H_2O$