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JEE Main & Advanced JEE Main Paper Phase-I (Held on 08-1-2020 Morning)

  • question_answer
    The first ionization energy (in kJ/mol) of Na, Mg, Al and Si respectively, are [JEE MAIN Held On 08-01-2020 Morning]

    A) 786, 737, 577, 496

    B) 496, 577, 786, 737

    C) 496, 737, 577, 786

    D) 496, 577, 737, 786

    Correct Answer: C

    Solution :

    [c] Ionization energy of elements belonging to period III in general increases as we move from left to right with the exception of Group-2 and Group-15 elements due to their stable configuration. The increasing order of first ionization energy of the given elements is \[Na<Al<\text{M}g<Si\] Ionisation energy of the given metals are Na: 496 kJ/mol; Al: 577 kJ/mol Mg: 737 kJ/mol; Si: 786 kJ/mol


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