Chemical Engineering Thermodynamics
Two substances are in equilibrium in a reversible chemical reaction. If the concentration of each substance is doubled, then the value of the equilibrium constant will be

Same
Halved
One fourth of its original value
Doubled

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Chemical Engineering Thermodynamics
A refrigeration cycle is a reversed heat engine. Which of the following has the maximum value of the co-efficient of performance (COP) for a given refrigeration effect?

Vapor compression cycle using expansion valve
Carnot refrigeration cycle
Vapor compression cycle using expansion engine
Air refrigeration cycle

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