Which type of bond is present in $H_2S$ molecule?

Number of electrons in the valence orbit of nitrogen in an ammonia molecule are

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

Which one of the following species does not exist?

Which one of the following has the longest covalent bond distance?

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