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(D) $i$. $CrO_3$ and $Mn_2O_7$ are acidic oxides,not basic oxides. Thus,statement $i$ is incorrect.$ii$. $V_2O_3$ is a basic oxide and $V_2O_4$ is an

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$i, ii, iii$

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(D) $i$. $CrO_3$ and $Mn_2O_7$ are acidic oxides,not basic oxides. Thus,statement $i$ is incorrect.$ii$. $V_2O_3$ is a basic oxide and $V_2O_4$ is an amphoteric oxide. Thus,statement $ii$ is incorrect.$iii$. $W(VI)$ is more stable than $Cr(VI)$ because stability of higher oxidation states increases down the group. Thus,statement $iii$ is incorrect.Therefore,all statements $i, ii,$ and $iii$ are incorrect.

Identify the statements which are not correct.
$i$. $CrO_3$ and $Mn_2O_7$ are basic oxides
$ii$. $V_2O_3$ and $V_2O_4$ are acidic oxides
$iii$. $Cr(VI)$ is more stable than $W(VI)$

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Identify the statements which are not correct.$i$. $CrO_3$ and $Mn_2O_7$ are basic oxides$ii$. $V_2O_3$ and $V_2O_4$ are acidic oxides$iii$. $Cr(VI)$ is more stable than $W(VI)$