Metallurgical Thermodynamics and Kinetics MCQ Questions and Answers

31

If 'Δx' represents adherent oxide layer thickness and 't' is time, which of the following curves represents diffusion controlled oxidation kinetics?
Metallurgical Thermodynamics and Kinetics mcq question image

Metallurgical Thermodynamics and Kinetics mcq question image

A) P B) Q C) R D) S

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Answer & Solution

Answer: Option B

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32

The reduction of FeO with CO gas in co-current flow is given by the following equation:
FeO + CO = Fe + CO₂, ΔG° = 8120 J at 1173K The ratio of pco/pco₂ for this reaction at 1173K is

A) 0 B) 0.25 C) 0.44 D) 2.3

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Answer & Solution

Answer: Option D

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33

Zinc oxide is reduced at a constant temperature in a closed reactor using ZnO(s) and C(s) as the only starting materials. The following reactions are assumed to be at thermodynamic equilibrium:
ZnO(s) + C(s) = Zn(g) + CO(g)
2CO(g) = CO₂(g) + C(s)
Assume ideal gas behaviour. Based on mole balance, the relationship applicable to the system at equilibrium is

A) Pzn = Pco + 2Pco₂ B) Pzn = 2pco + Pco₂ C) Pzn = pco + Pco₂ D) Pzn = 0.5 Pco + 2Pco₂

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Answer & Solution

Answer: Option A

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34

For the irreversible reaction, Ca + C = CaC₂, ΔH°₂₉₈ = - 60,000 J.mol^-1. If a system, initially containing 2 moles of calcium, 3 moles of carbon and one mole of calcium carbide, is allowed to react to completion, the heat evolved, at 298 K will be . . . . . . . . J.

A) 30,000 B) 60,000 C) 90,000 D) 240,000

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Answer & Solution

Answer: Option C

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35

The half-life period for second order reactions is given as

A) $${t_{\frac{1}{2}}} = \frac{{\left[ {{A_0}} \right]}}{{2K}}$$ B) $${t_{\frac{1}{2}}} = \frac{{0.693}}{K}$$ C) $${t_{\frac{1}{2}}} = \frac{1}{{K\left[ {{A_0}} \right]}}$$ D) $${t_{\frac{1}{2}}} = \frac{3}{{2K{{\left[ {{A_0}} \right]}^2}}}$$

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Answer & Solution

Answer: Option C

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36

The expression for first law of thermodynamics

A) dU = δq - δW B) dU = δP - δW C) dU = δP + δW D) dQ = δU - δW

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Answer & Solution

Answer: Option A

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37

The effect of change in temperature on the entropy of formation of an ideal binary solution, ΔS^{M, id}, is such that ΔS^{M, id}

A) increases with temperature B) decreases with temperature C) is always zero D) is independent of temperature

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Answer & Solution

Answer: Option B

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38

At absolute zero temperature, for any reaction involving condensed phases

A) ΔG° = 0, ΔH° = 0 B) ΔH° = 0, ΔS° = 0 C) ΔS° = 0, ΔE° = 0 D) ΔS° = 0, ΔC_P° = 0

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Answer & Solution

Answer: Option C

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39

In a binary system, the difference in chemical potentials of two components (μi - μj) is equal to

A) $$\frac{{d{G_m}}}{{dxj}}$$ B) 0 C) $$\left( {1 - xj} \right)\frac{{d{G_m}}}{{dxj}}$$ D) $$ - \frac{{d{G_m}}}{{dxj}}$$

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Answer & Solution

Answer: Option D

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40

One mole of element P is mixed with one mole of element Q. The entropy of jnixing at 0°K is

A) 0 B) - R In 0.5 C) infinity D) - R In 2

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Answer & Solution

Answer: Option B

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Metallurgical Thermodynamics and Kinetics MCQ Questions and Answers | Metallurgical Engineering