MCQ
Solder is an alloy of
- A$70\%$ lead, $ 30\%$ tin
- ✓$30\%$ lead, $70\%$ tin
- C$80\%$ lead, $20\%$ tin
- D$90\%$ $Cu, 10\%$ tin
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${K}_2 \mathrm{Cr}_2 \mathrm{O}_7$ & ${CuSO}_4$
SideX $SPM$ Side $\mathrm{Y}$ Due to osmosis :