\(\overset{X}{\mathop{I}}\,\overset{-1}{\mathop{Cl}}\,:\,\,X-1\,=0\,\,\,\,\Rightarrow X=+1\)
\(\overset{+1}{\mathop{H}}\,\overset{X}{\mathop{I}}\,:\,\,\left( +1 \right)+X=0\,\,\,\Rightarrow X=-1\)
\({{\overset{X}{\mathop{I}}\,}_{2}}\,\,:\,\,X=0\)
\(\overset{+1}{\mathop{H}}\,\overset{X}{\mathop{I}}\,{{\overset{-2}{\mathop{O}}\,}_{4}}\,\,:\,\,\left( +1 \right)+X+4\left( -2 \right)=0\,\,\,\Rightarrow \,\,\,X=+7\)
આથી, આયોડિનના ઓ.આંકનો ઘટતો ક્રમ નીચે પ્રમાણે થાય.
\(HI{O_4}\,\,\, > \,\,ICl\,\,\, > \,\,\,{I_2}\,\,\, > \,\,\,HI\)
${P_4} + 10C{l_2}\xrightarrow{\Delta }PC{l_5}$
${H_2}\mathop S\limits^{ } {O_4}\,\,\,\,\, \to \,\,\,\,\,\mathop S\limits^{ } {O_2}$
$H_3PO_4 + 3OH^{-} \rightarrow PO_4^{3-} + 3H_2O$