Which pair of elements can form multiple bonds with itself and oxygen?

Sulphur is most soluble in

Which element among the following has the maximum bond energy?

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:

Which of the following properties is $NOT$ exhibited by carbon?

In the carbon family,elements other than carbon do not form $p\pi - p\pi$ bonds because their atomic radii are very ........