Which of the following element has lowest melting point?

Options

A $\mathrm{Cr}$
B $\mathrm{Fe}$
C $\mathrm{Ni}$
D $\mathrm{Cu}$

Correct answer

D. $\mathrm{Cu}$

Step-by-step solution

Cu has lowest melting point because it has lowest enthalpy of atomisation (i.e., heat required to break the metal lattice to get free atoms) among the elements.

\begin{array}{lllll} & \mathrm{Ni}>\mathrm{Fe}>\mathrm{Cr}>\mathrm{Cu} \\ \text{ Enthalpy of atomisation : } & 430 & 416 & 397 & 339 \\ (\text{ in kJ mol }\end{array}

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