MCQ
Gun metal is an alloy of
- A$Cu$ and $Al$
- ✓$Cu,\,Sn$ and $Zn$
- C$Cu,\,Zn$ and $Ni$
- D$Cu$ and $Sn$
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(image) $+ NaNO_2+HCl \rightarrow $ product
$A$. $\mathrm{Ti}^{3+}$ $B$. $\mathrm{Cr}^{2+}$ $C$. $\mathrm{Mn}^{2+}$ $D$.$\mathrm{Fe}^{2+}$ $E$. $\mathrm{Sc}^{3+}$
Choose the most appropriate answer from the options given below.