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 to form chromic sulphate,releasing oxygen gas in the process.$4CrO_5 + 6H_2SO_4 \rightarrow 2Cr_2(SO_4)_3 + 6H_2O + 7O_2$Therefore,both the formation of the blue colour and the evolution of oxygen are observed.

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

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