Consider a reaction sequence as follows- FeCr2O4 - Na2CO3 - O2 -X- H2O -Y- H2O2-Z-Which of the following statements is true for the compounds -X- -Y- and -Z-

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Variable Oxidation States

Consider a re...

Question

Consider a reaction sequence as follows:
$F e C r_{2} O_{4} + N a_{2} C O_{3} + O_{2} F u s i o n - --- \to [X] H^{+} - - \to H_{2} O [Y] H^{+} - - \to H_{2} O_{2} [Z]$
Which of the following statements is true for the compounds [X], [Y] and [Z]?

In all the three compounds, the chromium is in

+ 6

oxidation state.

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[Z]

is a deep blue-violet coloured compound which decomposes rapidly in aqueous solution into

C r^{3 +}

and dioxygen.

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Saturated solution of

[Y]

gives bright orange compound, chromic anhydride with concentrated

H_{2} S O_{4}

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All of the above are correct.

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Solution

The correct option is D All of the above are correct.
The complete reaction sequence is as follows:
$F e C r_{2} O_{4} + N a_{2} C O_{3} + O_{2} F u s i o n - --- \to N a_{2} + V I C r O_{4} H^{+} - - \to H_{2} O N a_{2} + V I C r_{2} O_{7} H^{+} / H_{2} O_{2} - ----- \to + V I C r O (O_{2})_{2}$ (deep blue violet) $H_{2} O - - \to O_{2} + H_{2} O + C r^{3 +}$

Hence, we can see that in all the three compounds, $N a_{2} C r O_{4} [X], N a_{2} C r_{2} O_{7} [Y]$ and $C r O (O)_{2} [Z]$ , chromium is in the $+ 6$ oxidation state.

Also, $C r O (O)_{2}$ is a deep blue-violet coloured compound which decomposes rapidly in aqueous solution into $C r^{3 +}$ and dioxygen.

Besides, saturated solution of $C r_{2} O_{7}^{2 -}$ gives bright orange compound, chromic anhydride with concentrated $H_{2} S O_{4}$ .
$N a_{2} C r_{2} O_{7} + H_{2} S O_{4} \to 2 C r O_{3}$ (chromic anhydride) $+ N a_{2} S O_{4} + H_{2} O$
Hence, all statements are correct.

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Consider a reaction sequence as follows:FeCr2O4+Na2CO3+O2Fusion−−−−→[X]H+−−→H2O[Y]H+−−→H2O2[Z]Which of the following statements is true for the compounds [X], [Y] and [Z]?

Consider a reaction sequence as follows:
$F e C r_{2} O_{4} + N a_{2} C O_{3} + O_{2} F u s i o n - --- \to [X] H^{+} - - \to H_{2} O [Y] H^{+} - - \to H_{2} O_{2} [Z]$
Which of the following statements is true for the compounds [X], [Y] and [Z]?