2. Questions Bank
  3. JEE Main & Advanced
  4. Chemistry
  5. Coordination Chemistry

JEE Main & Advanced Chemistry Coordination Chemistry Question Bank Mock Test - Coordination Compounds

  • question_answer
    Nickel (Z = 28) combines with a uninegative monodentate ligand \[{{X}^{-}}\] to form a paramagnetic complex \[{{[Ni{{X}_{4}}]}^{2-}}\]. The number of unpaired electron(s) in the nickel and geometry of the complex ion are, respectively:

    A) One, tetrahedral

    B) Two, tetrahedral

    C) One, square planar

    D) Two, square planar

    Correct Answer: B

    Solution :

    [b] If \[{{X}^{-}}\] is weak field ligand (say\[C{{l}^{-}}\]), then \[{{[NiC{{l}_{4}}]}^{2-}}\] is tetrahedral \[(s{{p}^{3}})\]with two unpaired electrons. If \[{{X}^{-}}\]is strong field ligand (say\[C{{N}^{-}}\]), then \[{{[Ni{{(CN)}_{4}}]}^{2-}}\]is square planar \[(ds{{p}^{2}})\]with no unpaired electrons. Also given \[{{[Ni{{X}_{4}}]}^{2-}}\]is paramagnetic, so \[{{X}^{-}}\]is weak ligand.


You need to login to perform this action.
You will be redirected in 3 sec spinner