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JEE MainChemistrySolid State

In a certain solid substance, the magnetic moments of the domains are aligned in parallel and anti-parallel directions in unequal numbers, resulting in a net magnetic moment. Which of the following substances exhibits this type of magnetic behaviour?

Options

  1. AMnO
  2. BCrO ₂
  3. CFe ₃ O ₄
  4. DNaCl

Correct answer

C. Fe ₃ O ₄

Step-by-step solution

The description provided corresponds to ferrimagnetism, where the magnetic moments of domains are aligned in parallel and anti-parallel directions in unequal numbers, leading to a small net magnetic moment. Fe ₃ O ₄ (magnetite) is a classic example of a ferrimagnetic substance. MnO is antiferromagnetic (equal and opposite domain alignment). CrO ₂ is ferromagnetic (all domains aligned parallel). NaCl is diamagnetic (no unpaired electrons, weakly repelled by magnetic fields). Answer: Fe ₃ O ₄

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