When chlorine react with water, it gives HCl and oxygen.
$\underset{\text { Chlorine }}{\mathrm{Cl}_2}+\underset{\text { Water }}{\mathrm{H}_2 \mathrm{O}} \longrightarrow 2 \mathrm{HCl}+[\mathrm{O}]$

While other reactions take place as follows :

$\underset{\text { Sodium thiosulphate }}{\mathrm{Na}_2 \mathrm{~S}_2 \mathrm{O}_3(a q)}+\mathrm{Cl}_2+\mathrm{H}_2 \mathrm{O} \longrightarrow$
$\underset{\text { Sulphur }}{\mathrm{S}}+\underset{\text { Sodium sulphate }}{\mathrm{Na}_2 \mathrm{SO}_4}+2 \mathrm{HCl}$

$\underset{\substack{\text { Sodium } \\ \text { hydroxide }}}{\mathrm{NaOH}}+\mathrm{Cl}_2 \longrightarrow \underset{\substack{\text { Sodium } \\ \text { chloride }}}{\mathrm{NaCl}}+\underset{\begin{array}{c}\text { Sodium } \\ \text { hypochlorite }\end{array}}{\mathrm{NaClO}}+\mathrm{H}_2 \mathrm{O}$

$$
\underset{\begin{array}{l}
\text { Calcium } \\
\text { hydroxide }
\end{array}}{\mathrm{Ca}(\mathrm{OH})_2}+\mathrm{Cl}_2 \longrightarrow \underset{\substack{\text { Calcium } \\
\text { oxychloride }}}{\mathrm{CaOCl}_2}+\mathrm{H}_2 \mathrm{O}
$$