MCQ
Choose correct order of $\Delta {H_{eg}}$ ?
($\Delta {H_{eg}} = e^-$ gain enthalpy)
- A$S < Se < O$
- B$O < Se < S$
- C$S < O < Se$
- ✓$Se < S < O$
✓
Answer
Correct option: D.
$Se < S < O$
d
Aqueous solution of $\mathrm{SO}_{2}$ acts as a reducing agent
Aqueous solution of $\mathrm{SO}_{2}$ acts as a reducing agent
$\text{S}{{\text{O}}_{2}}+2{{\text{H}}_{2}}\text{O}\to {{\text{H}}_{2}}\text{S}{{\text{O}}_{4}}+\,\underset{nascent\,\,\,hydrogen}{\mathop{2H}}\,$
Thus, $\mathrm{SO}_{2}$ in presence of moisture is used as bleaching agent. This is due to the reducing nature of $\mathrm{SO}_{2}-$ For delicate articles
Coloured matter $+\mathrm{H} \longrightarrow$ Colourless matter
Similarly, $\mathrm{Cl}_{2}$ acts as bleaching agent in presence of moisture
$\text{C}{{\text{l}}_{2}}+{{\text{H}}_{2}}\text{O}\to 2\text{HCl}+[\text{O}]$
Coloured matter $+\,[O]\,\to $ Colourless matter
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