Question

Acidified K₂Cr₂O₇ solution turns green when Na₂SO₃ is
added to it. This is due to the formation of :
(a) Cr₂(SO₄)₃ (b) CrO₄²⁻
(c) Cr₂(SO₃)₃ (d) CrSO₄

Answer 1

Answer:

(d)crso4

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Answer 2

Acidified K₂Cr₂O₇ solution turns green when Na₂SO₃ is

added to it. This is due to the formation of :

(a) Cr₂(SO₄)₃

Acidified K₂Cr₂O₇ turns green when Na₂SO₃ is  added to it, due to the formation of Cr₂(SO₄)₃.

The presence of Cr³⁺ turns the resulting solution green.

The chemical reaction showing the above transition is shown below.

K₂Cr₂O₇ +  3Na₂SO₃ + 4 H₂SO₄ → Cr₂(SO₄)₃ + 3Na₂SO₄ + K₂SO₄ + 4H₂O

Thus option (a) is the correct answer.