Question

$NaCl,Na{NO}_3,{\left({NH}_4\right)}_2{SO}_4,Pb{SO}_4$

Pick the odd one out.

Answer 1

In $NaCl$, the negative part (Chloride) contains $-1$ charge and in ${NaNO}_3,{NO}_3^{2-}$ have $-2$ cahrge

${\left({NH}_4\right)}_2{SO}_4,{SO}_4^{2-}$ have $-2$ charge

${PbSO}_4,{SO}_4^{2-}$ have $-2$ charge.

So, the add one would be $NaCl$, in which ${Cl}^{-1}(-1)$ charge in present.