
- A$A = Ni, B = H_2O\, (liquid), C = H_2O$
- ✓$A = Zn, B = H_2O \,(steam), C = H_2 (Ni-Al\, alloy)$
- C$A = Mg, B = H_2O \,(liquid), C = HCl$
- D$A = Zn, B = H_2O \,(boiling), C = SnCl_2$


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$\begin{array}{*{20}{c}}
{C{H_3} - CH = CH - CH - CH - C{H_3}} \\
{{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} \,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,{\mkern 1mu} {\mkern 1mu} |{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} \,\,\,\,\,\,\,\,\,\,\,{\mkern 1mu} {\mkern 1mu} |{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} } \\
{\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,\,OH{\mkern 1mu} {\mkern 1mu} {\mkern 1mu} {\mkern 1mu} \,\,\,\,{\mkern 1mu} {\mkern 1mu} \,\,\,{\mkern 1mu} {\mkern 1mu} OH\,\,}
\end{array}\,$
| List - I | List - II | ||
| (A) | Bronze | (I) | Cu,Ni |
| (B) | Brass | (II) | Fe,Cr,Ni,C |
| (C) | UK silver coin | (III) | Cu,Zn |
| (D) | Stainless Steel | (IV) | Cu,Sn |