NCERT Class XII Chemistry <br> Chapter - The p-Block Elements <br> Questions with Solutions

NCERT Class XII Chemistry
Chapter - The p-Block Elements
Questions with Solutions

Question : 19

Total: 74

Knowing the electron gain enthalpy values for O → O– and O →O‌2– as –141 and 702 kJ mol‌–1 respectively, how can you account for the formation of large number of oxides having O‌2– species and not O‌– ?
Hint : Consider lattice energy factor in the formation of compound.

Solution:

This can be explained with the help of electronic configuration.

As O‌2– has most stable configuration amongst these. So, formation of O‌2– ismuch more easier. In solid state, large amount of energy (lattice enthalpy)is released to form divalent O‌2– ions.It is greater lattice enthalpy of O‌2–which compensates for the high energy required to remove the secondelectron.

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NCERT Class XII Chemistry Chapter - The p-Block Elements Questions with Solutions

NCERT Class XII Chemistry
Chapter - The p-Block Elements
Questions with Solutions