Identify ferromagnetic substance from following.

Identify ferromagnetic substance from following.
  1. NaCl
  2. $\mathrm{C}_6 \mathrm{H}_6$
  3. $\mathrm{CrO}_2$
  4. $\mathrm{H}_2 \mathrm{O}$

Asked in: MHT CET 2024 (04 May Shift 1)

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