Metallurgical Thermodynamics and Kinetics MCQ Questions and Answers

21

The oxidation reaction lines of metals/nonmetals parallel to x- axis in Ellingham diagram is corresponds to

A) Change in entropy zero B) Change in enthalpy zero C) Change in free energy zero D) Change in temperature zero

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Answer & Solution

Answer: Option A

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22

What is the temperature range for CO where it can act as reducing agent for iron oxide reduction

A) Less than 1000°C B) More than 1000°C C) Does not depends on temperature D) None of these

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Answer & Solution

Answer: Option A

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23

The activity of pure hydrogen gas at 1000°C and 5 atm. pressure.

A) is always less than 1 B) is always greater than 1 C) can be 5 D) depends on the choice of the standard state

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Answer & Solution

Answer: Option D

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24

If two system P & Q are in thermal equi librium with a third system M, then P and Q will also be in thermal equilibrium with each other. This is following . . . . . . . . law of thermodynamics.

A) first B) second C) third D) zeroth

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Answer & Solution

Answer: Option D

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25

As the temperature increases, the solubility of gas in molten metal . . . . . . . . at constant pressure

A) increase B) decrease C) remain constant D) none of these

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Answer & Solution

Answer: Option A

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26

A chemical reaction whose rate does not depend on concentration of reactants is called

A) Zero order reaction B) first order reaction C) second order reaction D) third order reaction

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Answer & Solution

Answer: Option A

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27

If k is the rate constant for a reaction and T is the absolute temperature in the given figure, the activation energy for the reaction is . . . . . . . . J/K mole.
Metallurgical Thermodynamics and Kinetics mcq question image

Metallurgical Thermodynamics and Kinetics mcq question image

A) 1000 B) 2000 C) 4155 D) 8314

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Answer & Solution

Answer: Option D

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28

The erder of a chemical reaction

A) can be determined only expedrimentally B) can be determined from the stoichiometry of the reaction C) can not be zero D) can be fractional

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Answer & Solution

Answer: Option B

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29

In reaction equilibria occuring between pure condensed phases and a gas phase, the equilibrium constant, K

A) can be written solely in terms of those species which occur only in the gas phase B) is always independent of the species that occur in the gas phase C) can be written solely in terms of those species which occur only in the pure condensed phases D) depends only on the concentration of pure species present in the mixture of condensed phases

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Answer & Solution

Answer: Option A

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30

When one mole of the substance is completely burnt in oxygen. The heat evolve is known

A) Heat of combustion B) Heat of reaction C) Heat of formation D) None of these

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Answer & Solution

Answer: Option A

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Metallurgical Thermodynamics and Kinetics MCQ Questions and Answers | Metallurgical Engineering