Q61 / 180 · AIIMS 2013 · Chemistry

Which of the following element has lowest melting point?

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

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

Hence, the correct answer is option: 'D'.

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