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Which of the following group of elements are diamagnetic ?

  • A.Argon, copper, silver
  • B.Hydrogen, argon, copper
  • C.Oxygen, copper, silver
  • D.Hydrogen, oxygen, argon

Answer: A

Argon, copper and silver are diamagnetic.

A diamagnetic substance has all its electrons paired, so it has no permanent magnetic moment and is weakly repelled by a field. Oxygen has two unpaired electrons and is paramagnetic, and hydrogen atoms are paramagnetic though \(\mathrm{H_2}\) is not.

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