A metal complex having composition exists in two forms A and B. Form A reacts with to give a white p — Coordination Compounds Chemistry Question
Question
A metal complex having composition $Cr(NH_3)_4Cl_2Br$ exists in two forms A and B. Form A reacts with $AgNO_3$ to give a white precipitate readily soluble in dilute ammonia. Form B gives a pale yellow precipitate. What is the formula of A?
Answer: A
💡 Solution & Explanation
White ppt soluble in dil. $NH_3$ is $AgCl$, meaning $Cl^-$ is outside the sphere. Pale yellow is $AgBr$, meaning $Br^-$ is outside. Thus A has $Cl^-$ outside: $[Cr(NH_3)_4ClBr]Cl$ [63, 64].
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