To an acidified dichromate solution, Na2O2 is added and shaken. What is observed?
A
Blue colour
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B
Orange colour changing to green directly
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C
Copious evolution of oxygen
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D
Bluish-given precipitate
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Solution
The correct option is A
Blue colour
This is a standard question from many different exams. In this reaction, CrO5 is Chromium (VI) oxide peroxide - a blue coloured compound - is produced.