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JEE Main & Advanced Sample Paper JEE Main Sample Paper-39

  • question_answer
    Given the molecular formula of the hexa-coordinated complexes (i) \[CoC{{l}_{3}}.6N{{H}_{3}},\](ii) \[CoC{{l}_{3}}.5N{{H}_{3}},\](iii) \[CoC{{l}_{3}}.4N{{H}_{3}}\]If the number of co-ordmated \[N{{H}_{3}}\]molecules in i, ii and iii respectively are 6, 5, 4, the primary valencies in (i), (ii) and (iii) are:

    A)  6, 5, 4                        

    B)  3, 2, 1

    C)  0, 1, 2                        

    D)  3, 3, 3

    Correct Answer: B

    Solution :

     Since each of (i), (ii) and (iii) are hexa- coordinated, in the case of (ii), one of the chlorines (chloride ions) is coordinated to the central cobalt ion and in (iii), two' such chlorides are coordinately linked. Thus, the ionisable chlorides in (i) is three in (ii) it is two and in (iii) it is only one. Primary valency means the valency of the complex cation.


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