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

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

p-Block elementsHard

Question

Which of the following can convert acidified Cr₂O₇^2- to green ?

A.SO₂ / H₂SO₃ / H₂SO₄

B.SO₃ / H₂SO₃ / H₂S

C.SO₃^2- / H₂S / Fe²⁺

D.S₂O₃^2- / SO₃ / Fe³⁺

Reducing agents can reduce Cr₂O₇^2- to Cr³⁺ (green solution).

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