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

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

The addition of dilute $NaOH$ to $Cr^{3+}$ salt solution will give:

Discuss the catalytic properties of transition elements.

On adding $KI$ to a solution of copper sulphate,what happens?

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 $W(VI)$