Chemistry
Ionisation energy of nitrogen is greater than that of oxygen because nitrogen has

High nuclear charge
Stable half filled 2p sub level
Smaller atomic radius
High bond dissociation energy

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Chemistry
Ammonial is a mixture of

Aluminium powder and potassium nitrate
Aluminium powder and ammonium nitrate
Aluminium powder and ammonium sulphate
Aluminium powder and ammonium chloride

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