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Which one of the following does not correctly represent the correct order of the property indicated against it?
A
Ti < V < Mn < Cr : increasing 2nd ionization enthalpy
B
Ti < V < Cr < Mn : increasing number of oxidation states
C
$Ti^{3+} < V^{3+} < Cr^{3+} < Mn^{3+}$ : increasing magnetic moment
D
Ti < V < Cr < Mn : increasing melting points
Detailed Solution
Melting point depends on the number of unpaired d-electrons taking part in metallic bonding. It rises up to Cr and then drops sharply at Mn, whose stable $3d^54s^2$ configuration holds its electrons tightly.
Mn (about 1519 K) melts lower than Ti, V and Cr; Cr has the highest melting point of the four.
So Ti < V < Cr < Mn is not the correct order of melting points. The other three orders are correct.
Mn (about 1519 K) melts lower than Ti, V and Cr; Cr has the highest melting point of the four.
So Ti < V < Cr < Mn is not the correct order of melting points. The other three orders are correct.