Chemical Engineering Thermodynamics
When a gas is subjected to adiabatic expansion, it gets cooled due to

Decrease in velocity
Decrease in kinetic energy
Decrease in temperature
Energy spent in doing work

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Chemical Engineering Thermodynamics
In the reaction, H₂ +I₂ ⇋ 2HI, addition of an inert gas will

Not effect the equilibrium conditions
Increase the partial pressure of I₂
Increase the partial pressure of H₂
Increase the total pressure and hence shift the equilibrium towards the right

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