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JEE Main2017Chemistrys Block ElementsActual

Consider the following ionization enthalpies of two elements 'A' and 'B'. Element Ionization enthalphy kJ / mol 1 st 2 nd 3 rd A 899 1757 14847 B 737 1450 7731 Which of the following statements is correct?

Options

  1. ABoth 'A' and 'B' belong to group-1 where 'A' comes below 'B'.
  2. BBoth 'A' and 'B' belong to group-2 where 'A' comes below 'B'.
  3. CBoth 'A' and 'B' belong to group-1 where 'B' comes below 'A'.
  4. DBoth 'A' and 'B' belong to group-2 where 'B' comes below 'A'.

Correct answer

D. Both 'A' and 'B' belong to group-2 where 'B' comes below 'A'.

Step-by-step solution

Both 'A' and 'B' belong to group-2, because the 3 rd ionization energy is very high, it means 3 rd electron gets removed from internal shell and where 'B' comes below 'A', because on moving from top to bottom in group the ionization energy decreases.

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