MCQ
Solder is an alloy of
- A$Pb + Zn + Sn$
- B$Pb + Zn$
- ✓$Pb + Sn$
- D$Sn + Zn$
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(Given : $\Delta_{\mathrm{r}} \mathrm{H}_{298 \mathrm{~K}}^{\circ}=-54.07 \mathrm{~kJ} \mathrm{~mol}^{-1}, \Delta_{\mathrm{I}} \mathrm{S}_{298 \mathrm{~K}}^{\circ}=10 \mathrm{JK}^{-1} \mathrm{~mol}^{-1}$ and $\mathrm{R}=8.314 \mathrm{JK}^{-1} \mathrm{~mol}^{-1} ; 2.303 \times 8.314 \times 298=5705$ )


$PC{l_5}\, \rightleftharpoons \,PC{l_3}\, + \,C{l_2}\,;\,{K_C} = \,0.0414\,mol\,{L^{ - 1}}$

