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At 4000 K what happens to the gas?

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At 4000 K what happens to the gas?

(a) Oxygen is dissociated completely

(b) Nitrogen is dissociated completely

(c) Oxygen is dissociated completely, nitrogen begins to dissociate

(d) Ionization of both oxygen and nitrogen

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This question is from Microscopic Description of Gases topic in portion Properties of High Temperature Gases of Aerodynamics

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Right answer is (c) Oxygen is dissociated completely, nitrogen begins to dissociate

The explanation: Up to 2500 K, there is no reaction taking place and oxygen starts to dissociated. At 4000 K, oxygen gets completely dissociated and nitrogen begins the process of dissociation. The reaction is as follows:

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