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Select correct statements.

A

In less acidic solution` K_2 Cr_2 O_7` and `H_2O_2` give blue coloured `CrO(O_2)_2`

B

In alkaline `H_2 O_2 ,K_3 CrO_8` (with tetraperoxo species) `[Cr(O_2)_4]^(3-)` is formed

C

In ammoniacal solution, `K_2 Cr_2 O_7` gives `(NH_3 )_2 CrO_4`

D

`CrO_(4)^(2-)` changes to `Cr_2 O_(7)^(2-)` by oxidation

Text Solution

Verified by Experts

The correct Answer is:
A, B, C
`A) CrO_(4)^(2-) +2 H^(+) + 2H_2 O_(2) to CrO(O_2)_2 +3 H_2 O`
B) When `K_2 CrO_4 ` is shaken with aqueous KOH in presence of `H_2 O_2` reddish brown `K_3 CrO_3` is formed, which contains four peroxo ligands.
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