p-Block elementsHard

Question

Which of the following can convert acidified Cr2O72- to green ?

Options

A.SO2 / H2SO3 / H2SO4
B.SO3 / H2SO3 / H2S
C.SO32- / H2S / Fe2+
D.S2O32- / SO3 / Fe3+

Solution

Reducing agents can reduce Cr2O72- to Cr3+ (green solution).

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