AIIMS 2018 Chemistry Transition Metals MCQ Question

Chromium (Cr) can replace aluminum (Al) in certain compounds due to its similar ionic radius and oxidation states, allowing for the formation of K₂SO₄·Cr₂(SO₄)₃·24H₂O, a double sulfate complex. This reaction illustrates the principle of substitution in coordination chemistry, where one metal ion can displace another in a compound. Other options are not applicable as they do not pertain to the context of chromium's ability to replace aluminum or the formation of the specified compound. Understanding these substitution reactions is crucial for grasping the behavior of transition metals in coordination complexes.