b
\(6\text{C}{{\text{l}}_{2}}+2\text{Ba}{{(\text{OH})}_{2}}\to \) \(\underset{(X)}{\mathop{\text{Ba}{{\left( \text{Cl}{{\text{O}}_{3}} \right)}_{2}}}}\,+5\text{BaC}{{\text{l}}_{2}}+6{{\text{H}}_{2}}O\)

\(\text{Ba}{{\left( \text{Cl}{{\text{O}}_{3}} \right)}_{2}}+{{\text{H}}_{2}}\text{S}{{\text{O}}_{4}}\to \underset{(Y)}{\mathop{2\text{HCl}{{\text{O}}_{3}}}}\,+\text{BaS}{{\text{O}}_{4}}\downarrow \)

\(2\text{HCl}{{\text{O}}_{3}}\overset{{}}{\mathop{\frac{\Delta }{\Delta >365\,\text{K}}}}\,2\text{Cl}{{\text{O}}_{2}}+{{\text{H}}_{2}}\text{O}+\frac{1}{2}{{\text{O}}_{2}}\)