Cobalt chloride when dissolved in water forms pink colored complex X which has octahedral geometry. This solution on treating with conc. HCl forms deep blue complex, Y which has a Z geometry. X, Y and

Question

Cobalt chloride when dissolved in water forms pink colored complex X which has octahedral geometry. This solution on treating with conc. HCl forms deep blue complex, Y which has a Z geometry. X, Y and Z, respectively, are

(A) X = [Co(H2O)4Cl2]+, Y = [CoCl4]2–, Z = Tetrahedral
(B) X = [Co(H2O)6]2+, Y = [CoCl6]3–, Z = Octahedral
(C) X = [Co(H2O)6]2+, Y = [CoCl4]2–, Z = Tetrahedral
(D) X = [Co(H2O)6]3+, Y= [CoCl6]3–, Z = Octahedral

Prashant Kotian · Accepted Answer

Correct answer: C. CoCl2 + H2O  [Co(H2O)6]2+       HCl . conc [CoCl4]2– Pink colour Deep blue Octahedral Tetrahedral (Z) ‘X’ ‘Y’ Hence X = [Co(H2O)6]2+, Y = [CoCl4]2–, Z = Tetrahedral | JEE(Main) 2023 | DATE : 31-01-2023 (SHIFT-1) | PAPER-1 | CHEMISTRY PAGE # 8

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