arrange the following as stated
1)N,O,F,Cl (increasing order of electron gain enthalpy)
2) F,O,N,Cl (increasing order of electronnegativity)
3)P,N,S,O (increasing orer of ionizationenthalpy)

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Solution

1. Cl > F > O > N - (Electron gain enthalpy increases on moving across a period and decreases on moving down the group. But due to small size of fluorine it has lesser than chlorine)
2. F > O > N=Cl - (Electronegativity increases on moving across a period)
3. O >N > P > S - (Ionisation energy increases on moving across a period and decreases on moving down the group)

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arrange the following as stated1)N,O,F,Cl (increasing order of electron gain enthalpy)2) F,O,N,Cl (increasing order of electronnegativity)3)P,N,S,O (increasing orer of ionizationenthalpy)

arrange the following as stated
1)N,O,F,Cl (increasing order of electron gain enthalpy)
2) F,O,N,Cl (increasing order of electronnegativity)
3)P,N,S,O (increasing orer of ionizationenthalpy)