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| 1. |
NiO is antiferromagnetic. But on heating at 250^(@)C, it becomes paramagnetic. Why? |
| Answer» Solution :In solid state, the magnetic moments of NiO are aligned in such a FASHION, such that the net moment is ZERO. So. NiO is ANTIFERROMAGNETIC. On heating, the alignment is DISTURBED. The domains are randomized.`Ni^(2+)` has `d^(8)` configuration with unpaired electrons, hence, exhibits paramagnetism | |