Which one of the following sets correctly represents the increase in the paramagnetic property of the ion?
Cu2+ < V2+ < Cr2+ < Mn2+
Cu2+ < Cr2+ < V2+ < Mn2+
Mn2+ < V2+ < Cr2+ < Cu2+
Mn2+ < Cu2+ < Cr2+ < V2+
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Which of the following statements about the interstitial compounds is incorrect?