If a molecule $X_2$ has a triple bond,then $X$ will have the electronic configuration

$P\pi - P\pi$ bonding occurs between oxygen and

Which of the following elements can be involved in $p \pi-d \pi$ bonding with oxygen?

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

What is the formal charge on the carbon atom in the $CO_3^{2-}$ ion?

Covalent compounds are generally ...... in water.