CHEMICAL ENGINEERING THERMODYNAMICS QUIZ

Fugacity of a component in an ideal gas mixture is euqal to the partial pressure of that component in the mixture. The fugacity of each component in a stable homogeneous solution at contant pressure and temperature __________ as its mole fraction increases.

Decreases

Remains constant

Decreases exponentially

Increases

TRUE ANSWER : ?
YOUR ANSWER : ?

Free energy changes for two reaction mechanism 'X' and 'Y are respectively - 15 and - 5 units. It implies that X is

Slower than Y

Three times slower than Y

Three times faster than Y

Faster than Y

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YOUR ANSWER : ?

In case of steady flow compression polytropic process (PVn = constant), the work done on air is the lowest, when

N = 0

N = 1.66

N = 1

N = y = 1.4

TRUE ANSWER : ?
YOUR ANSWER : ?

The energy of activation of exothermic reaction is

Very large compared to that for en-dothermic reaction

Zero

Negative

Not possible to predict

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YOUR ANSWER : ?

Joule-Thomson effect i.e., a throttling process is a constant __________ process.

Internal energy

Temperature

Enthalpy

Entropy

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YOUR ANSWER : ?

__________ law of thermodynamics ascertains the direction of a particular spontaneous process.

Third

First

Second

Zeroth

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YOUR ANSWER : ?

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

Air refrigeration cycle

Vapor compression cycle using expansion engine

Carnot refrigeration cycle

TRUE ANSWER : ?
YOUR ANSWER : ?

First law of thermodynamics is mathematically stated as

dQ = dE + dW

dE = dQ + dW

dQ = dE - dW

dW = dQ + dE

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YOUR ANSWER : ?

The fusion of a crystalline solid at its melting point to form a liquid at the same temperature is accompanied by

Decrease of entropy

Decrease in enthalpy corresponding to evolution of heat

Increase in enthalpy corresponding to absorption of heat

No change in enthalpy

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YOUR ANSWER : ?

The rate at which a substance reacts is proportional to its active mass and the rate of a chemical reaction is proportional to the product of active masses of the reacting substances. This is the

Le-Chatelier's principle

Statement of Vant-Hoff equation

None of these

Lewis-Randall rule

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YOUR ANSWER : ?

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