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FeCr(2)O(4)+Na(2)CO(3)+O(2)overset("Fusi...

`FeCr_(2)O_(4)+Na_(2)CO_(3)+O_(2)overset("Fusion")(rarr)[X]underset(H_(2)O)overset(H^(+))(rarr)[Y]underset(H_(2)O_(2))overset(H^(+))(rarr)[Z]`
Which of the following statement is true for the compounds [X],[Y] and [Z] ?

A

In all three compounds , the chromium is in `+6` oxidation state.

B

`[Z]` is a deep blue - violet coloured compound which decomposes rapidly in aqueous solution into `Cr^(3+)` and dioxygen

C

Saturated solution of [Y] gives bright organge compound, chromic anhydride, with concentrated `H_(20SO_(4)`.

D

`[X]` is an oxidizing agent under acidic conditions.

Text Solution

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The correct Answer is:
A,B,C,D
`4FeCr_(2)O_(4)+8Na_(2)CO_(3)+7O_(2)overset("Fusion")(rarr)overset(+VI)(Na_(2)CrO_(4))underset(H_(2)O)overset(H^(+))(rarr)overset(+VI)(Na_(2)Cr_(2)O_(7))overset(H^(+)//H_(2)H_(2)O_(2))(rarr)overset(+VI)(CrO(O_(2))_(2))("deep blue violet")overset(H_(2)O)(rarr)O_(2)+H_(2)O+Cr^(3+)`
`Na_(2)Cr_(2)O_(7)+H_(2)SO_(4)rarr2Cr_(3)("chromic anhydride")+Na_(2)SO_(4)+H_(2)O`
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