Difficult
Among the following groups of oxides,the group containing oxides that cannot be reduced by carbon to give the respective metals is
- A$Cu_2O, K_2O$
- B$Fe_2O_3, ZnO$
- C$CaO, K_2O$
- D$PbO, Fe_3O_4$
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Thermite is a mixture of $X$ parts of ferric oxide and $Y$ parts of aluminium powder. $X, Y$ respectively are
$I$. $FeCr_2O_4 + NaOH + \text{air} \rightarrow Na_2CrO_4 + Fe_2O_3$
$II$. $Na_2CrO_4 + H_2SO_4 \rightarrow Na_2Cr_2O_7$
$Na_2CrO_4$ and $Fe_2O_3$ are separated by:
$II$. $Na_2CrO_4 + H_2SO_4 \rightarrow Na_2Cr_2O_7$
$Na_2CrO_4$ and $Fe_2O_3$ are separated by:
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