What happens when naphthalene balls are put inside kerosene?

Explain the formation of $H_{2}$ molecule on the basis of Valence Bond Theory.

The electronic configuration of three elements $A$,$B$ and $C$ are given below. Stable form of $C$ may be represented by the formula
$A : 1s^2, 2s^2, 2p^6$
$B : 1s^2, 2s^2, 2p^6, 3s^2, 3p^3$
$C : 1s^2, 2s^2, 2p^6, 3s^2, 3p^5$

The type of bonds present in sulphuric anhydride $(SO_3)$ are:

Identify the type of bonding present in the solid crystal of carborundum $(SiC)$.

How many electrons are shared between atoms in a double bond?