${{\Lambda }^{o}}_{NaCl}=\Lambda _{N{{a}^{+}}}^{o}+{{\Lambda }^{o}}_{C{{l}^{-}}}=128$
$\Lambda _{KN{{O}_{3}}}^{o}=\Lambda _{{{K}^{+}}}^{o}+\Lambda _{NO_{3}^{-}}^{o}=111\,;$
$\Lambda _{NaN{{O}_{3}}}^{o}=\Lambda _{NaCl}^{o}+\Lambda _{KN{{O}_{3}}}^{o}-\Lambda _{KCl}^{o}$
$\Lambda _{NaN{{O}_{3}}}^{o}=128\,+\,111-152$
$\Lambda _{NaN{{O}_{3}}}^{o}=87\,\,s\,c{{m}^{2}}\,mo{{l}^{-1}}$
$\mathrm{Cr}_2 \mathrm{O}_7{ }^{2-}+14 \mathrm{H}^{+}+6 \mathrm{e}^{-} \rightarrow 2 \mathrm{Cr}^{3+}+7 \mathrm{H}_2 \mathrm{O}, \mathrm{E}^{\circ}=1.33 \mathrm{~V}$
$\mathrm{Fe}^{3+}(\mathrm{aq})+3 \mathrm{e}^{-} \rightarrow \mathrm{Fe} \mathrm{E}^{\circ}=-0.04 \mathrm{~V}$
$\mathrm{Ni}^{2+}(\mathrm{aq})+2 \mathrm{e}^{-} \rightarrow \mathrm{Ni} \mathrm{E}^{\circ}=-0.25 \mathrm{~V}$
$\mathrm{Ag}^{+}(\mathrm{aq})+\mathrm{e}^{-} \rightarrow \mathrm{Ag} \mathrm{E}^{\circ}=0.80 \mathrm{~V}$
$\mathrm{Au}^{3+}(\mathrm{aq})+3 \mathrm{e}^{-} \rightarrow \mathrm{Au} \mathrm{E}^{\circ}=1.40 \mathrm{~V}$
આપેલી ઇલેક્ટ્રોકેમિસ્ટ્રી પ્રતિક્રિયાઓને લઈને, જે ધાતુ(ઓ) આકસ્મિક થશે તેનું ક્રોમિયમ ઓક્સાઇડ અમળમાં $\mathrm{Cr}_2 \mathrm{O}_7{ }^{2-}$ ના મૂળ્ય છે. . . . . .