Published by:
CGP EDU Academic Team
Published on: August 12, 2026
Which are correct statements?
Text Solution
Verified by ExpertsThe correct answer is:
A
(a, b, c)
Acidified K2Cr2O7 solution reacts with H2O2 to give a deep blue solution due to the formation of CrO5.
Cr2O72– + 2H+ + 4H2O2 
2CrO5 + 5H2O
In alkaline medium with 30% H2O2, a red-brown K2CrO8 (diperoxo) is formed. It is tetra peroxo species [Cr(O2)4]3– and thus the Cr is in +V oxidation state.
In ammoniacal solution a dark red-brown compound, (NH3)3CrO4 - diperoxo compound with Cr(IV) is formed.
In CrO42– the Cr is in its highest +6 oxidation state. So it can not be further oxidised.
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