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When H2O2is shaken with an acidified solution of K2Cr2O7in presence of ether, the ethereal layer turnsblue due to the formation ofA. Cr2O3 B. CrO42? C. Cr2 4 SO 3b g D. CrO5

aniket anand , 11 Years ago
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Arun

Last Activity: 4 Years ago

blue colour is obtained when hydrogen peroxide is added to dichromate or any other Cr(VI) compound. The deep blue colour is due to formation of CrO(O2)2.

Vikas TU

Last Activity: 4 Years ago

 
Let’s check out the reaction of hydrogen peroxide with acidified Potassium dichromate:
 
K2Cr2O7 + H2SO4 + 4H2O2 ------> K2SO4 + 2CrO5 + 5H2O
 
The formation of Chromium Pentaoxide leads to the formation of blue colour from orange (as potassium dichromate is orange in colour). Chromium Pentaoxide is blue in colour, so we get a blue colour after the reaction.
 
In the reaction, Hydrogen peroxide acts as an oxidizing agent, because it itself gets reduced, and its oxidation number changes to -2 from -1.

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