An element $(X)$ when burnt in oxygen forms a neutral oxide $(XO)$ and an acidic oxide $(XO_2)$. The element $(X)$ is:

$A$ red solid is insoluble in water. However,it becomes soluble if some $KI$ is added to water. Heating the red solid in a test tube results in the liberation of violet-coloured fumes and droplets of a metal appear on the cooler parts of the test tube. The red solid is:

Which of the following oxides is amphoteric in character?

Two statements are given below.
Statement $I$: $SnF_4$ and $PbF_4$ are ionic in nature.
Statement $II$: $GeCl_2$ is more stable than $GeCl_4$.
The correct answer is:

Give the chemical reaction for preparing pure $CO$.

The option$(s)$ with only amphoteric oxides is(are)
$[A]$ $Cr_2O_3, BeO, SnO, SnO_2$
$[B]$ $Cr_2O_3, CrO, SnO, PbO$
$[C]$ $NO, B_2O_3, PbO, SnO_2$
$[D]$ $ZnO, Al_2O_3, PbO, PbO_2$