Question

Study the physical properties of metal 'X' given in the box.

Based on these properties, identify 'X'.

• A. Copper
• B. Graphite
• C. Potassium
• D. Iodine

Answer 1

The correct option is A Copper

M.P (melting point) of copper $={1085}^{\circ }C$, graphite $={3500}^{\circ }C$ (almost), potassium $={63.5}^{\circ }C$, iodine $={113.7}^{\circ }C$.
Even though graphite has higher melting point than copper, it is less conducting than copper as electrical resistivity of graphite and copper are $3.00\times {10}^{-6}\Omega m$ and $1.68\times {10}^{-8}\Omega m$ at ${20}^{\circ }C$ respectively. Also graphite is less malleable than copper. (one of the reasons of using copper in electric wires is it's malleability apart from it's electrical conductivity.)