i. \( \mathrm{FeCr}_{2} \mathrm{O}_{4}+{ }^{\top}{ }_{2} \mathrm{CO}_{3}+\mathrm{O}_{2} \stackrel{\text { Fusion }}{\longrightarrow}[\mathrm{X}] \underset{\mathrm{H}_{2} \mathrm{O}}{\stackrel{\mathrm{H}^{+}}{\longrightarrow}}[Y] \stackrel{\mathrm{H}_{2} \mathrm{O}_{2} / \mathrm{H}^{+}}{\longrightarrow}[Z] \)
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 \( \mathrm{Cr}^{3+} \) and dioxygen
(c) Saturated solution of \( [Y] \) gives bright orange compound, chromic anhydride, with concentrated \( \mathrm{H}_{2} \mathrm{SO}_{4} \)
(d) All of these
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