Q.

The first (IE1) and second (IE2) ionisation enthalpies (kJ/mole) of element, A are given below.             AIE1      750IE2     1500In an experiment 1/12 mole of A atom in vapour phase absorb 100 kJ of energy. So that it forms a mixture of A+ and A2+ ions. Energy utilized to form A2+ from A+ in experiment is

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a

1500 kJ

b

750 kJ

c

62.5 kJ

d

37.5 kJ

answer is D.

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Detailed Solution

Energy required to convert A to A+=112  ×  750=62.5  kJRemaining energy to convert A+  to  A2+ =100−62.5 =37.5  kJ.
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The first (IE1) and second (IE2) ionisation enthalpies (kJ/mole) of element, A are given below.             AIE1      750IE2     1500In an experiment 1/12 mole of A atom in vapour phase absorb 100 kJ of energy. So that it forms a mixture of A+ and A2+ ions. Energy utilized to form A2+ from A+ in experiment is