(c) Metals are usually not found as nitrates in their ores, because metal nitrates are highiy soluble in
water. For example, KNO₃ (salt peter) would be classilied as completely soluble. Thus, KNO₃ could be expected to dissociate counpleteiy in aqueous solution into K⁺ and ${\mathrm{NO}}_3^{-}$ ions.

${\mathrm{KNO}}_3\stackrel{}{\rightleftharpoons }{K}^{+}\left(\mathrm{aq}\right)+{\mathrm{NO}}_3^{-}\left(\mathrm{aq}\right)$

The nitrate anion has three equivalent oxygen surrounding a central nitrogen atom. This tends to spread the single negative charge and make it easier for water (using hydrogen bonds) to separate the ions in solution.

please practice the question on neetprep website chapterwise as this question is given in practice question