Question
Name one metal which displaces copper from copper sulphate solution and one which does not.
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$\text{Na(s)}+\text{S(s)}\xrightarrow{\text{Fuse}}\text{Na}_2\text{S(s)}$
$\text{A}_2\text{O}_3\ +\ \text{2B}\xrightarrow{\ \ \ \ \ \ \ \ \ \ }\text{B}_2\text{O}_3\ +\ \text{2A}$