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The melting point of Mn is lower than that of Cr and Fe in 3d series

The melting point of W (tungsten) is highest in 5d series.

The melting point of Tc is higher than that of Mo but lower than that of Ru in 4d series.

The order of melting points of 3d, 4d and 5d series is: 5d >4d >3d

answer is B.

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Detailed Solution

The melting point of Tc is lower than that of Mo.
The dip in melting point of Mn (3d series) and Tc (4d series) is because of their stable half filled configuration, i.e., (Mn = 3d⁵ 4s²) and Tc (4d⁵ 5s²). Hence e^-'s are held tightly by the nucleus so that the delocalization is less and the metallic bond is much weaker than that of preceding and next elements.

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