To an acidified dichromate solution,a pinch o | vedclass

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(D) When $Na_2O_2$ is added to an acidified dichromate solution,it reacts to form chromium pentoxide $(CrO_5)$,which is deep blue in colour.$Cr_2O_7^{

Vedclass · Accepted Answer

Both $(A)$ and $(C)$

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(D) When $Na_2O_2$ is added to an acidified dichromate solution,it reacts to form chromium pentoxide $(CrO_5)$,which is deep blue in colour.$Cr_2O_7^{2-} + 2H^+ + 4H_2O_2 \rightarrow 2CrO_5 + 5H_2O$$CrO_5$ is unstable and decomposes rapidly in acidic medium to form chromic sulphate $(Cr_2(SO_4)_3)$ and releases oxygen gas $(O_2)$.$4CrO_5 + 6H_2SO_4 \rightarrow 2Cr_2(SO_4)_3 + 6H_2O + 7O_2$Therefore,initially,a blue colour is observed,followed by the evolution of oxygen gas. Thus,both $(A)$ and $(C)$ are correct.

To an acidified dichromate solution,a pinch of $Na_2O_2$ is added and shaken. What is observed?

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