Vanadium $(III)$ oxide $(V_2O_3)$ is a strong:

Which of the following metals becomes passive when treated with concentrated $HNO_3$?

Which of the following compounds does not react with cold and dil. $HNO_3$?

Which transition metal reduces steam to evolve hydrogen?

Which is the most reactive metal among the given options?

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 $W(VI)$