Consider the following ionization enthalpies of two elements 'A' and 'B'. A: 1^ st 899, 2^ nd 1757, 3^ rd 14847; B: 1^ st 737, 2^ nd 1450, 3^ rd 7731 (kJ/mol). Which of the following statements is correct?

JEE Main 2017 Chemistry question

Chemistry Classification of Elements and Periodicity in Properties JEE Main 2017

Consider the following ionization enthalpies of two elements 'A' and 'B'. A: , , ; B: , , (kJ/mol). Which of the following statements is correct?

(1)Both 'A' and 'B' belong to group-1 where 'A' comes below 'B'.
(2)Both 'A' and 'B' belong to group-2 where 'A' comes below 'B'.
(3)Both 'A' and 'B' belong to group-1 where 'B' comes below 'A'.
(4)Both 'A' and 'B' belong to group-2 where 'B' comes below 'A'.Correct

Answer: (4)

Solution

Two pieces of information are hidden in the data. **Which group?** Look for the big jump, which marks the point at which a stable noble-gas core must be broken into. For A the jump comes between the () and () ionization enthalpies — a factor of more than eight. For B the

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Question ID VK-115805