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JEE Mains · Chemistry · STD 11 - 3. Classification of elements and periodicity in properties

\(Na , Mg\) तथा \(Si\) की प्रतिम आयनन एन्थैल्पी है क्रमशः \(496, 737\) तथा \(786\,kJ\,mol ^{-1}\) । \(Al\) की प्रथम आयनन एन्थैल्पी \(\left( kJ mol ^{-1}\right)\) है:

  1. A \(487\)
  2. B \(768\)
  3. C \(577\)
  4. D \(856\)
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Answer & Solution

Correct Answer

(C) \(577\)

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Detailed explanation

\(I. E\; : \;Na < Al < Mg < Si\) \(\therefore \quad 496<\operatorname{IE}( Al )<737\) Option \((C)\), matches the condition. i.e \(\operatorname{IE}( Al )=577 \;kJmol ^{-1}\)
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