Question

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

• A. Fe < Mn, Ru < Tc and Re < Os
• B. Mn < Fe, Tc < Ru and Os < Re
• C. Mn < Fe, Tc < Ru and Re < Os
• D. Fe < Mn, Ru < Tc and Os < Re

Hint:

In general, elements in the same group or period have comparable melting points, but this can vary based on electron configuration and atomic structure.

Answer 1

The Correct Option is C

The task is to establish the melting point order for element pairs: (Mn, Fe), (Tc, Ru), and (Re, Os). Four choices are available. Analysis of each pair is as follows:

1. Mn (Manganese) vs. Fe (Iron):
   Manganese exhibits a lower melting point than Iron. Consequently, Mn < Fe.
2. Tc (Technetium) vs. Ru (Ruthenium):
   Technetium, positioned earlier in its group than Ruthenium, has a lower melting point. Therefore, Tc < Ru.
3. Re (Rhenium) vs. Os (Osmium):
   Rhenium possesses a lower melting point than Osmium. Thus, Re < Os.

The deduced melting point relationships are Mn < Fe, Tc < Ru, and Re < Os.

This aligns with the provided correct option: Mn < Fe, Tc < Ru, and Re < Os