Name two substances in given case

Contain only molecules.

Name two substances in the following case.

Contain only ions.

Name two substances that contain ions as well as molecules.

Select the ion in each case, that would get selectively discharged from the aqeuous mixture of the ions listed below:

${\mathrm{SO}}_4^{2-},{\mathrm{NO}}_3^{-}$ and ${\mathrm{OH}}^{-}$.

Select the ion in each case, that would get selectively discharged from the aqueous mixture of the ions listed below:

${\mathrm{Pb}}^{2+},{\mathrm{Ag}}^{+}$ and ${\mathrm{Cu}}^{2+}$.

Among $\mathrm{Zn}$ and $\mathrm{Cu}$, which would occur more readily in nature as metal and which as ion?

Why we cannot store ${\mathrm{AgNO}}_3$ solution in a copper vessel?

Out of $\mathrm{Cu}$ and $\mathrm{Ag}$, which is more active?

How would you change a metal like $\mathrm{Cu}$ into its ions?