Which reaction among the following gives nascent oxygen?

Which reaction among the following gives nascent oxygen?
  1. $\mathrm{Na}_2 \mathrm{SO}_3+\mathrm{Cl}_2 \xrightarrow{\mathrm{H}_2 \mathrm{O}}$
  2. $\mathrm{NaOH}+\mathrm{Cl}_2 \longrightarrow$
  3. $\mathrm{Ca}(\mathrm{OH})_2+\mathrm{Cl}_2 \longrightarrow$
  4. $\mathrm{Cl}_2+\mathrm{H}_2 \mathrm{O} \longrightarrow$

Solution

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} $

Asked in: AP EAMCET 2021 (25 Aug Shift 2)

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