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

1. Fe < Mn, Ru < Tc and Re < Os
2. Mn < Fe, Tc < Ru and Re < Os
3. Mn < Fe, Tc < Ru and Os < Re
4. Fe < Mn, Ru < Tc and Os < Re

Correct answer: Mn < Fe, Tc < Ru and Os < Re

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