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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$\left[ Ag \left( H _{2} O \right)_{2}\right]\left[ Ag ( CN )_{2}\right]$ is :