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The Solid State
Question
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Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point.

  • LiCl

  • NaCl

  • KCl

  • RbCl

Answer

B.

NaCl

Although lattice energy of LiCl higher than NaCl but LiCl is covalent in nature and NaCl ionic thereafter, the melting point decreases as we move NaCl because the lattice energy decreases as a size of alkali metal atom increases (lattice energy ∝ to melting point of alkali metal halide)

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Some More Questions From The Solid State Chapter

Solid A is a very hard, electrical insulator in solid as well as in molten state and melts at extremely high temperature. What type of solid is it?

Ionic solids conduct electricity in liquid state but not in solid state. Explain.

What type of solids are electrical conductors, malleable and ductile?

Give the significance of a 'lattice point'.

Name the parameters that characterize a unit cell.

Distinguish between Hexagonal and monoclinic unit cells.

Distinguish between Face-centred and end-centred unit cells.

What is the two-dimensional coordination number of a molecule in square close packed layer ?