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JEE CHEMISTRY MCQ: d & f- BLOCK ELEMENTS

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The correct option with order of melting points of the pairs (Mn,Fe),(\mathrm{Mn}, \mathrm{Fe}), (Tc,Ru)(\mathrm{Tc}, \mathrm{Ru}) and (Re,Os)(\mathrm{Re}, \mathrm{Os}) is:
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Correct option: C
Mn<Fe,\mathrm{Mn}< \mathrm{Fe}, Tc<Ru\mathrm{Tc}< \mathrm{Ru} and Os<Re\mathrm{Os}< \mathrm{Re}
Option C (Mn<Fe,\mathrm{Mn}< \mathrm{Fe}, Tc<Ru\mathrm{Tc}< \mathrm{Ru} and Os<Re\mathrm{Os}< \mathrm{Re}) is correct because melting points generally increase with the number of unpaired electrons, but decrease when the d-orbitals are nearly half-filled or completely filled.

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