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What is chemical equilibrium?

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What is chemical equilibrium?

(a) Change in temperature spontaneously

(b) No change in chemical composition spontaneously

(c) Change in pressure

(d) Equilibrium between mole fractions

The question was posed to me during an interview for a job.

Enquiry is from High Temperature Gases topic in division Properties of High Temperature Gases of Aerodynamics

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Right option is (b) No change in chemical composition spontaneously

To explain: In a mixture of gases (air), when there is no sudden change in the chemical composition spontaneously or over a short period of time, the system is known to be in chemical equilibrium. There are no changes in temperature, velocity, pressure in the system.

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