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JEE Main & Advanced JEE Main Paper Phase-I (Held on 09-1-2020 Morning)

  • question_answer
    Complex X of composition \[Cr{{\left( {{H}_{2}}O \right)}_{6}}C{{l}_{n}}\] has a spin only magnetic moment of 3.83 BM. It reacts with \[AgN{{O}_{3}}\] and shows geometrical isomerism. The IUPAC nomenclature of X is [JEE MAIN Held on 09-01-2020 Morning]

    A) Tetraaquadichlorido chromium(III) chloride dehydrate

    B) Hexaaqua chromium (III) chloride

    C) Tetraaquadichlorido chromium (IV) Chloride dehydrate

    D) Dichloridotetraaqua chromium (IV) chloride dehydrate

    Correct Answer: A

    Solution :

    [a] Complex : \[Cr{{\left( {{H}_{2}}O \right)}_{6}}C{{l}_{n}}\]  Spin only magnetic moment = \[\sqrt{n\left( n+2 \right)}\]BM \[=\sqrt{3.8}\]BM n = no. of unpaired electrons             \[\therefore n=3\] \[\therefore \] Cr is in +3 oxidation state \[\because \] Complex shows geometrical isomerism and also reacts with  \[AgN{{O}_{3}}\] \[\therefore \] Complex \[\left[ Cr{{\left( {{H}_{2}}O \right)}_{4}}C{{l}_{2}} \right]Cl.2{{H}_{2}}O\] IUPAC Name : Tetraaquadichloridochromium (III) chloride dihydrate


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