MCQ
Which alloy contains $Cu, Sn$ and $Zn$
- ✓Gun metal
- BSolder
- CBell metal
- DGerman silver
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$A$. has been used in spaceship
$B$. has as efficiency of $40 \%$ to produce electricity
$C$. uses aluminium as catalysts
$D$. is eco-friendly
$E$. is actually a type of Galvanic cell only