The correct option with the order of melting | vedclass

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Question

(C) The melting points of transition metals depend on the number of unpaired electrons and the strength of metallic bonding.For the $3d$ series, $Mn$

Vedclass · Accepted Answer

$Mn < Fe$, $Tc < Ru$ and $Os < Re$

Vedclass · Answer

(C) The melting points of transition metals depend on the number of unpaired electrons and the strength of metallic bonding.For the $3d$ series, $Mn$ has a lower melting point than $Fe$ because $Mn$ has a stable $d^5$ configuration, which results in weaker metallic bonding compared to $Fe$.For the $4d$ and $5d$ series, the trend is $Tc Thus, the correct order is $Mn < Fe$, $Tc < Ru$, and $Os < Re$.

The correct option with the order of melting points of the pairs $(Mn, Fe)$, $(Tc, Ru)$ and $(Re, Os)$ is $:$

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