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Question

Assertion (A): Noble gases have very low boiling points.

Reason (R): All noble gases have a general electronic configuration of ns2np6 (except He).


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Solution

Group 18

  • The elements present in group 18 are helium, neon, argon, krypton, xenon, and radon.
  • All these are gases and chemically unreactive.
  • Only a few compounds are formed by these elements.
  • As a result, they are referred to as noble gases.
  • Their electronic configuration is ns2np6 in general (except He).

Explanation for Assertion statement

  • Due to minimal dispersion forces, noble gases have relatively low boiling points.
  • Noble gases have extremely low melting and boiling temperatures when compared to other substances with similar atomic and molecular weights.
  • This indicates that only weak van der Waals interactions or weak London dispersion forces exist between the atoms of noble gases in the liquid or solid state.
  • In general, the boiling and melting points increase from He to Rn as the van der Waals force increases due to an increase in the size of the atom on going down the group.

Reason statement

  • All noble gases have a general electronic configuration of ns2np6 (except He).
  • The given statement is true.

Hence, assertion and reason both are correct. But R is not the correct explanation of A.


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