NEET AIPMT SOLVED PAPER SCREENING 2008

  • question_answer
    Equimolar solutions of the following were prepared in water separately. Which one of the solutions will record the highest pH?

    A) \[SrC{{l}_{2}}\] 

    B)        \[BaC{{l}_{2}}\]                

    C) \[MgC{{l}_{2}}\]                              

    D) \[CaC{{l}_{2}}\]

    Correct Answer: B

    Solution :

    Key Idea: As the basic nature increases, pH increases pH of base > 7 pH of acid < 7 In alkaline earth metals on moving downward the size of cation increases, thus basicity increases. Hence, the increasing order of basicity is as:                                    \[MgC{{l}_{2}}<CaC{{l}_{2}}<SnC{{l}_{2}}<BaC{{l}_{2}}\] Therefore, the solution of \[BaC{{l}_{2}}\] will record the highest pH.


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