MCQ
Which of the following is correct
- ✓Gun metal :$Cu + Zn + Sn$
- BDuralumin : $Al + Cu + Mg + Ag$
- CGerman silver : $Cu + Zn + C$
- DSolder : $Pb + Al$
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$Pt(s) |H_2(g)\,|\,HCOOH(aq.)\,||\,CH_3COOH(aq.)\,|\,H_2(g)|Pt(s)$
at $25\,^o C$ is ............ $\mathrm{V}$
$(K_a$ of $HCOOH \,= 2.4 × 10^{-4}$ , $K_a$ of $CH_3COOH = 1.8 × 10^{-5}$ , $log\,2\, = 0.3,\, log \,0.48, \frac{2.303 \times 298 \times R}{F} = 0.06)$
Scheme $1$ : (image)
Scheme $2$ :(image)
Scheme $3$ :(image)
what is $'B'$ and $'C'$