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  4. Which of the following are basic oxides? Mn2O7, V2O3, V2O5, CrO, Cr2O3

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Q. Which of the following are basic oxides?
$Mn_2O_7$, $V_2O_3$, $V_2O_5$, $CrO$, $Cr_2O_3$

The d-and f-Block Elements

Solution:

In case of transition metal oxides, the oxides with metals in lower oxidation states are basic in nature. $O.S.$ of $Mn$ in $Mn_2O_7 = +7$; $V$ in $V_2O_3 = +3$; $V$ in $V_2O_5 = +5$; $Cr$ in $CrO = +2$; $Cr$ in $Cr_2O_3 = +3$
Thus in $V_2O_3$, $CrO$ and $Cr_2O_3$ transition metal ion is in lower oxidation state but $Cr_2O_3$ is amphoteric in nature. Hence $V_2O_3$ and $CrO$ are basic in nature.