Among the following,the bond angle is minimum between:

Compound $X$ is the anhydride of sulphuric acid. The number of $\sigma$-bonds and the number of $\pi$-bonds present in $X$ are,respectively:

Give reasons for the following:
$A$. Covalent bonds are directional bonds while ionic bonds are non-directional.
$B$. Water molecule has bent structure whereas carbon dioxide molecule is linear.
$C$. Ethyne molecule is linear.

Which of the following pairs have the same bond angles?
$(a) BF_3, BCl_3$
$(b) PO_4^{3-}, SO_4^{2-}$
$(c) BF_3, PF_3$
$(d) NO_2^+, N_2O$
$(e) N_3^-, NO_2$
Select the correct option:

Which of the following statements is correct?

What is the electronic theory of chemical bonding?