The number of alkali metal(s), from Li, K, Cs, Rb having ionization enthalpy greater than 400 kJ mol — JEE Mains Chemistry Past Papers Chemistry Question
Question
The number of alkali metal(s), from Li, K, Cs, Rb having ionization enthalpy greater than 400 kJ mol–1 and forming stable super oxide is _______.
Answer: .
💡 Solution & Explanation
Metal Li Na K Rb Cs IE (KJ/mol) 496 403 The super oxide O2– ion is stable only in the presence of large cations K, Rb, Cs. K, Rb have IE1 > 400 kJ/mol.
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