When \( \mathrm{SO}_{2} \) gas is passed through an acidified solution of \( \mathrm{K}_{2} \mat...

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When \( \mathrm{SO}_{2} \) gas is passed through an acidified solution of \( \mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7} \).
(1) The solution becomes blue
(2) The solution becomes colourless
(3) \( \mathrm{SO}_{2} \) is reduced
(4) Green \( \mathrm{Cr}_{2}\left(\mathrm{SO}_{4}\right)_{3} \) is formed
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