\begin{array}{1 1} (a)\;(i) P_4+10 SO_2 Cl_2 \to 4 PCl_5 +10 SO_2 (ii) 2Fe^{3+} +SO_2+2H_2O \to 2Fe^{2+} +4H^{+}+SO_4^{2-} (iii) X_e F_6 +3H_2O \to X_eO_2 +6HF_6\\ (b)\;(i) P_4+10 SO_2 Cl_2 \to 4 PCl_5 +10 SO_2 (ii) 2Fe^{3+} +SO_2+2H_2O \to 2Fe^{2+} +4H^{+}+SO_4^{2-} (iii) X_e F_6 +3H_2O \to X_eO_3 +6HF \\ (c)\;(i) P_4+10 SO_2 Cl_2 \to 4 PCl_5 +8 SO_2 (ii) 2Fe^{3+} +SO_2+2H_2O \to 5Fe^{2+} +4H^{+}+SO_3^{2-} (iii) X_e F_6 +3H_2O \to X_eO_3 +6HF\\(d)\;(i) P_4+10 SO_2 Cl_2 \to 4 PCl_3 +5 SO_2 (ii) 2Fe^{3+} +SO_2+2H_2O \to 2Fe^{2+
} +8H^{+}+SO_4^{2-} (iii) X_e F_6 +3H_2O \to X_eO_3 +6HF \end{array}