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MCQEasyJEE Main 2023 · 31 January, Shift 1Ligands & Coordination Number

Chemistry Question from JEE Main 2023 · 31 January, Shift 1

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

  • A

    X=[Co(H2O)6]2+, Y=[CoCl4]2−, Z=TetrahedralX = [Co(H_2O)_6]^{2+}, \, Y = [CoCl_4]^{2-}, \, Z = \text{Tetrahedral}

  • B

    X=[Co(H2O)6]2+, Y=[CoCl6]3−, Z=OctahedralX = [Co(H_2O)_6]^{2+}, \, Y = [CoCl_6]^{3-}, \, Z = \text{Octahedral}

  • C

    X=[Co(H2O)6]3+, Y=[CoCl6]3−, Z=OctahedralX = [Co(H_2O)_6]^{3+}, \, Y = [CoCl_6]^{3-}, \, Z = \text{Octahedral}

  • D

    X=[Co(H2O)4Cl2]+, Y=[CoCl4]2−, Z=TetrahedralX = [Co(H_2O)_4Cl_2]^{+}, \, Y = [CoCl_4]^{2-}, \, Z = \text{Tetrahedral}

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