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NEET Sample Paper NEET Sample Test Paper-68

  • question_answer
    Given the molecular formula of the hexa coordinated complexes [A] \[CoC{{l}_{3}}.\,\,6N{{H}_{3}}\] [B] \[CoC{{l}_{3}}\,.\,5N{{H}_{3}}\] [C] \[CoC{{l}_{3}}\,.\,4N{{H}_{3}}\] If the number of coordinated \[N{{H}_{3}}\] molecules in A, B and C respectively are 6, 5 and 4, the primary valency B in [A], [B] and [C] are:                 

    A) 6, 5, 4              

    B) 3, 2, 1          

    C) 0, 1, 2              

    D) 3, 3, 3          

    Correct Answer: B

    Solution :

    The complexes can be written as follows \[\underset{(A)}{\mathop{\left[ Co{{\left( N{{H}_{3}} \right)}_{6}} \right]}}\,C{{l}_{3}}\,\underset{(B)}{\mathop{\left[ Co{{\left( N{{H}_{3}}  \right)}_{5}}\,Cl \right]}}\,C{{l}_{2}}\] \[\underset{(C)}{\mathop{\left[ Co{{\left( N{{H}_{3}} \right)}_{4}}C{{l}_{4}} \right]}}\,Cl\] Hence, number of primary valencies are 3, 2 and 1 respectively.


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