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To an acidified dichromate solution, a pinch of Na₂O₂ is added and shaken. What is observed?

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Blue colour

Orange colour changing to green directly

Copious evolution of oxygen

Bluish-green precipitate

answer is A.

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Detailed Solution

When Na₂O₂ is added to the acidified potassium dichromate solution, the deep blue CrO5 is obtained.
K₂Cr₂O₇+H₂SO₄+4Na₂O₂→2CrO₅+K₂SO₄+H₂O+4Na₂O₂

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