c
\(\mathop {Ba{{\left( {{H_2}P{O_2}} \right)}_2}}\limits^{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,2 + \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,} \) \({H_2}PO_2^{ - 1}\)
ધારો કે \(P\) નો ઓ.આંક \(= X\)છે.
\(\begin{array}{l}
2 \times 1 + X + 3 \times - 2 = - 1\\
X - 2 = - 1\\
X = + 2 - 1 = + 1
\end{array}\)