Which of the following substances has a giant covalent structure?

Which of the following processes is exothermic?

Suggest the most important type of intermolecular attractive interaction in the following pairs.
$(i)$ $n$-hexane and $n$-octane
$(ii)$ $I_{2}$ and $CCl_{4}$
$(iii)$ $NaClO_{4}$ and water
$(iv)$ methanol and acetone
$(v)$ acetonitrile $(CH_{3}CN)$ and acetone $(C_{3}H_{6}O)$

Which of the following intermolecular forces are present in solid hydrogen?

Which of the following forces is effective between noble gas atoms?

Inert gases are mixed in iodine vapours. Then there are . . . . . . between them.