MCQ
Which of the following is the weakest reducing agent
- A$Zn$
- ✓$Cu$
- C${H_2}$
- D$Li$
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[Given : Molar mass of water $=18 \mathrm{~g} \mathrm{~mol}^{-1}$, acetic acid $=60 \mathrm{~g} \mathrm{~mol}^{-1}$ ]
${ }^{\mathrm{K}_{\mathrm{f}}} \mathrm{H}_2 \mathrm{O}: 1.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$
$\mathrm{K}_{\mathrm{r}}$ acetic acid : $3.90 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$
freezing point: $\mathrm{H}_2 \mathrm{O}=273 \mathrm{~K}$, acetic acid $=290 \mathrm{~K}$ ]
$2H^+ + 2e^- + \frac{1}{2}O_2\longrightarrow H_2O_{(l)} ; $
$E^o = +1.23\, V$
$Fe^{2+} + 2e^- \longrightarrow Fe_{(s)} ;\ E^o = -0.44\,V$