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JEE CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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Application +4 | -1

First and second ionisation energies of magnesium are 7.646 and

15.035 \mathrm{eV}

respectively. The amount of energy in

\mathrm{kJ}

needed to convert all the atoms of magnesium into

\mathrm{Mg}^{2+}

ions present in

12 \mathrm{mg}

of magnesium vapours is :

[Given :

1 \mathrm{eV}=96.5 \mathrm{~kJ} \mathrm{~mol}^{-1}

]

View answer and explanation

Correct option: A

1.1

Option A (1.1) is correct because the total energy needed to convert all Mg atoms to Mg2+ ions is calculated using the ionization energies and the number of moles of Mg.

JEE CHEMISTRY MCQ: CLASSIFICATION OF ELEMENTS AND PERIODICITY IN PROPERTIES

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