Choose correct statement(s) regarding the following reaction.
Cr2O7^2-(aq) + 3SO3^2-(aq) + 8H^+ 2Cr^3+(aq) + 3SO4^2-(aq) + 4H2O

Question

Choose correct statement(s) regarding the following reaction.
Cr2O7^2-(aq) + 3SO3^2-(aq) + 8H^+ $\rightarrow$ 2Cr^3+(aq) + 3SO4^2-(aq) + 4H2O

Prashant Kotian · Accepted Answer

Correct answer: A,B,C,D. Step 1: In the first transition series (3d), chromium (Cr) has the maximum melting point due to its half-filled d-subshell (3d5 4s1) with maximum unpaired electrons contributing to strong metallic bonding. Step 2: Zinc (Zn) represents the minimum melting point of the first transition series (419°C), while cadmium (Cd) represents the minimum melting point of the second (4d) transition series (321°C). Step 3: Therefore, the maximum of the first series (Cr) and minimum of the second series (Cd) are matched in option (c).

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