\(\mathrm{SO}_{2}+\mathrm{V}_{2}^{+5} \mathrm{O}_{5} \longrightarrow \mathrm{SO}_{3}+\mathrm{V}_{2}^{+4} \mathrm{O}_{4}\)
\(\mathrm{V}_{2}^{+4} \mathrm{O}_{4}+\mathrm{O}_{2} \longrightarrow \mathrm{V}_{2}^{+5} \mathrm{O}_{5}\)
(આપેલઃ પરમાણુક્માંક $Sc : 21, Ti : 22, V : 23, Cr : 24, Mn : 25, Fe : 26$)
(પરમાણ્વીય ક્રમાંક ${Ho}=67$ )