BHU PMT BHU PMT (Screening) Solved Paper-2005

  • question_answer
    What will be the order of\[{{I}^{st}}\]ionisation energy?

    A)  \[Li>Na>K\]      

    B) \[K>Li>Na\]

    C)  \[Na>Li>K\]      

    D) \[Li>K>Na\]

    Correct Answer: A

    Solution :

                     \[Li>Na>K\] is the correct order of 1st ionisation energy because they are member of same group and 1st ionisation energy decreases with increase in size. In a group from top to bottom atomic radius increases.


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