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In 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

Copious evolution of oxygen

Bluish-green precipitate

answer is A, C.

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Detailed Solution

The acidified potassium dichromate solution becomes the rich blue ${CrO}_{5}$ when ${Na}_{2} O_{2}$ is added.

$K_{2} {Cr}_{2} O_{7} + H_{2} {SO}_{4} + 4 {Na}_{2} O_{2} \to 2 {CrO}_{5} + K_{2} {SO}_{4} + H_{2} O + 4 {Na}_{2} O_{2}$

The production of chromic sulphate causes the intense blue colour to fade. Through this process, oxygen is created.

$4 {CrO}_{5} + 6 H_{2} {SO}_{4} \to 2 {Cr}_{2} {({SO}_{4})}_{3} + 6 H_{2} O + 7 O_{2}$

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