TOPICWISE QUESTIONS

In which of the following molecules, the central atom expands its covalency by excitation but not its octet?

(a) ${\mathrm{ICl}}_2^{-}$

(b) ${\mathrm{C}}_2{\mathrm{H}}_4$

(c) ${\mathrm{BF}}_4^{-}$

(d) ${\mathrm{SO}}_2$

The ratio of the number of bond moments to the number of orbital dipoles in species ${\mathrm{AsCl}}_5^{2-}$is:

Which of the following is incorrect?

Assuming the Hund's rule violated, the bond order and magnetic nature of the diatomic molecule of ${\mathrm{B}}_2$ is:

The diamagnetic species among the following is/are:

$\mathrm{a}$. ${\mathrm{O}}_2^{2-}$                 $\mathrm{b}$. ${\mathrm{F}}_2$

$\mathrm{c}$. ${\mathrm{H}}_2^{+}$                   $\mathrm{d}$. ${\mathrm{CO}}^{+}$

Among the following pairs of molecules, the strongest intermolecular hydrogen bond is present between:

What is true about the given molecules?

The ratio of coordinate bonds, covalent bonds and hydrogen bonds in ${\mathrm{CuSO}}_4\mathbf{·}5{\mathrm{H}}_2\mathrm{O}$ is: