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a
The melting point of Mn is lower than that of Cr and Fe in 3d series
b
The melting point of Tc is higher than that of Mo but lower than that of Ru in 4d series.
c
The melting point of W (tungsten) is highest in 5d series.
d
The order of melting points of 3d, 4d and 5d series is: 5d >4d >3d
answer is B.
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