Chemistry PYQ 46 of 291 · Periodic Table

Which of the following has highest melting point?

  1. ABoron
  2. BIron
  3. CSilicon
  4. DAluminium
  5. ENone of the above/More than one of the above

66th BPSC Prelims Re-exam 2020

Show answer and explanation

Correct answer: (a) Boron

Explanation

Boron has a very high melting point, about 2076 °C (≈2349 K), because its atoms are joined in a strong covalent network.

The others melt lower: silicon about 1414 °C, iron about 1538 °C and aluminium only about 660 °C.

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