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JEE Main & Advanced Chemistry Classification of Elements and Periodicity in Properties / तत्त्वों का वर्गीकरण एवं गुणों में आवर्ति Question Bank Self Evaluation Test - Classification of Elements and Periodicity in Properties

  • question_answer
    Consider the following ionisation reactions:
    I.E.\[\left( kJ\text{ }mo{{l}^{-1}} \right)\]                  I.E. \[\left( kJ\text{ }mo{{l}^{-1}} \right)\]
    \[A(g)\to {{A}^{+}}(g)+{{e}^{-}},\,\,{{A}_{1}}\,\,A(g)~\to {{A}^{+}}(g)+{{e}^{-}},\,\,{{A}_{1}}\]
    \[{{B}^{+}}(g)\to {{B}^{2+}}(g)+{{e}^{-}},\,\,{{B}_{2}}C(g)\to {{C}^{+}}(g)+{{e}^{-}},\,\,{{C}_{1}}\]
    \[{{C}^{+}}(g)\to {{C}^{2+}}(g)+{{e}^{-}},\,\,{{C}_{1}}\,{{C}^{2+}}(g)\to {{C}^{3+}}(g)+{{e}^{-}},\,\,{{C}_{3}}\]
    If monovalent positive ion of A, divalent positive ion of B and trivalent positive ion of C have zero electron. Then incorrect order of corresponding I.E. is:

    A) \[{{C}_{3}}>{{B}_{2}}>{{A}_{1}}\]             

    B) \[{{B}_{1}}>{{A}_{1}}>{{C}_{1}}\]

    C) \[{{C}_{3}}>{{C}_{2}}>{{B}_{2}}\]             

    D) \[{{B}_{2}}>{{C}_{3}}>{{A}_{1}}\]

    Correct Answer: D

    Solution :

    [d]
    \[A\Rightarrow H\,(1{{s}^{1}})\]
    \[B\Rightarrow He\,(1{{s}^{2}})\]
    \[C\Rightarrow Li\,(1{{s}^{2}}2{{s}^{1}})\]
    \[{{A}_{1}}=I{{E}_{1}}(A){{B}_{2}}=I{{E}_{2}}(B)\]
    \[{{B}_{1}}=I{{E}_{1}}(B){{C}_{2}}=I{{E}_{2}}(C)\]
    \[{{C}_{1}}=I{{E}_{1}}(C){{C}_{3}}=I{{E}_{3}}(C)\]
    \[{{B}_{1}}>{{A}_{1}}>{{C}_{1}}{{C}_{3}}>{{B}_{2}}>{{A}_{1}}\]
    \[He>H>LiL{{i}^{2+}}H{{e}^{+}}H\]
    \[1{{s}^{2}}1{{s}^{1}}2{{s}^{1}}\ 1{{s}^{1}}1{{s}^{1}}1{{s}^{1}}\]
    \[{{C}_{3}}>{{C}_{2}}>{{B}_{2}}L{{i}^{2+}}L{{i}^{+}}H{{e}^{+}}\]
    \[1{{s}^{2}}\,1{{s}^{2}}\,1{{s}^{1}}\]


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