####40. Which one of the following statements is correct when $SO_2$ is passed through acidified $K_2 Cr_2 O_7$ solution?
[2016]
(a) The solution turns blue
(b) The solution is decolourized
(c) $SO_2$ is reduced
(d) Green $Cr_2(SO_4)_3$ is formed
(d) $K_2 Cr_2 O_7+SO_2+H_2 SO_4$
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