X(g) - X+(g) + e-, \Delta H = +720 kJ mol-1. Calculate the amount of energy required to convert 110 mg of 'X' atom in gaseous state into X+ ion. (Atomic wt. for X = 7 g/mol)

Question

X(g) -> X+(g) + e-, \Delta H = +720 kJ mol-1. Calculate the amount of energy required to convert 110 mg of 'X' atom in gaseous state into X+ ion. (Atomic wt. for X = 7 g/mol)

Prashant Kotian · Accepted Answer

Correct answer: C. Step 1: Analyze the group classification of the elements in each pair in the periodic table. Step 2: Li and Na both belong to Group 1 (alkali metals). Be and Ba both belong to Group 2 (alkaline earth metals). N and As both belong to Group 15 (pnictogens). O belongs to Group 16 (chalcogens) while At belongs to Group 17 (halogens). Step 3: Conclude that O and At belong to different groups, making (d) the different pair.

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