$2X_2 (g) + 2H_2O (l) \to 4H^+ (aq) + 4X^-(aq) + O_2 (g)$
$Y_2 (g) + H_2O (l) \to HY(aq) + HOY(aq)$
$Pb \left( NO _{3}\right)_{2} \stackrel{673 K }{\longrightarrow} A + PbO + O _{2}$
$A \stackrel{\text { Dimerise }}{\longrightarrow} B$
$(I)$ $TeF_6$ $(II)$ $SF_6$ $(III)$ $NCl_3$ $(IV)$ $NF_3$
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