1.

FeCr_2O_4+Na_2CO_3+O_2overset("Fusion")to[X]underset(H_2O)overset(H^+)to[Y]underset(H_2O_2)overset(H^+)to[Z] Which of the following statements is true for the compounds [X],[Y] and [Z] ?

Answer»

In all three COMPOUNDS , the CHROMIUM is in +6 oxidation STATE
[Z] is a deep blue -VIOLET coloured compound which decomposes rapidly in aqueous solution into `Cr^(3+)` and dioxygen
Saturated solution of [Y] gives bright organge compound , chromic anhydride, with concentrated `H_2SO_4`
All of these

Solution :`4FeCr_2O_4 8Na_2CO_3+7O_2overset("Fusion")tooverset(+VI)(Na_2CrO_4)underset(H_2O)overset(H^+)tooverset(+VI)(Na_2Cr_2O_7)overset(H^+ // H_2O_2)tooverset(+VI)(CrO(O_2)_2)`("deep blue violet")overset(H_2O)toO_2+H_2O+Cr^(3+)`
`Na_2Cr_2O_7+H_2SO_4to2CrO_3("chromic anhydride")+Na_2SO_4+H_2O`


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