Match the properties given in List-I with the metals given in List-II

Choose the correct answer from the options given below:

(A)-(III), (B)-(IV), (C)-(II), (D)-(I)

The correct answer is Option (2) → (A)-(III), (B)-(IV), (C)-(II), (D)-(I)

(A) An element which can show +8 oxidation state: Osmium (Os) and Ruthenium (Ru) are the two primary transition metals capable of reaching the highest known oxidation state of +8 (e.g., in $OsO_4$).

(B) 3d block element that can show up to +7 oxidation state: Manganese (Mn) has the highest oxidation state in the 3d series because it has the maximum number of valence electrons ($3d^5 4s^2$) available for bonding.

(C) 3d block element with the highest melting point: Chromium (Cr) has the highest melting point in the 3d series (approx. 1907°C) due to its $3d^5 4s^1$ configuration, which allows for strong interatomic metallic bonding with many unpaired electrons.

(D) 3d block element with the highest enthalpy of atomization: Vanadium (V) is often cited in this context. While Chromium has more unpaired electrons, Vanadium’s specific metallic bonding structure leads to a very high enthalpy of atomization (~515 kJ/mol), which is the highest in the 3d series.