Metallurgical Thermodynamics And Kinetics — Part 1 MCQs with Explanations

P. Pressure is an intensive variable because it remains the same regardless of the system's size or quantity. Q. Volume is an extensive variable because it depends on the size or amount of the system. R. Temperature is an intensive variable because it remains constant regardless of the system's size or quantity. S. Enthalpy is an extensive variable because it depends on the size or amount of the system. Based on the given options, the correct answer is: B. P, R

Heat of any system is the correct answer to “What is enthalpy”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

Both A and B is the correct answer to “What are the types of entropy”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

unary system is the correct answer to “Single component system is called”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

22400 is the correct answer to “The specific heat (C p ) of pure iron expressed in J/(mol.K) as a function of temperature T (in K) is given as: C p = 17.49 + 24.77 × 10 -3 T What is the change in the enthalpy of pure iron (in J/mol) when it is heated from 25°C to 700°C”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

0.05 is the correct answer to “Liquid steel contains initially 0.05 mass% P and this has to be reduced to 0.01 mass% using a basic slag. The equilibrium distribution ratio of P between slag and metal is $$Lp = \frac{{\left( {\% P} \right){\text{slag}}}}{{\left( {\% P} \right){\text{metal}}}}, = 80;$$ Assuming that in itially the slag does not contain any phosphorous (P), then the minimum weight of slag (ton) required per ton of steel is”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

3567 is the correct answer to “The fugacity of liquid water at 298 K is approximately 3171 Pa. Considering the ideal heat of vaporisation as 43723 J/gm. mole, its fugacity at 300 K would be . . . . . . . . Pascal.”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

independent of the number of moles in the system is the correct answer to “Intensive thermodynamic variables are:”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

$$e_x^y = \frac{{\partial \log fx}}{{\partial \left[ {\% Y} \right]}}$$ is the correct answer to “In a dilute solution of elements X, Y etc. in liquid iron, the effect of Y on the activity co-efficient (fx) and the activity (hx) of X with respect to the Henrian 1wt% standard state is taken into account by the activity interaction co-efficient e y x , which is”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

rate of the slowest step in the reaction is the correct answer to “The rate of sequential multistep reaction, in a chemically controlled process, is expressed by the Arrhenius equation, $$k = A{e^{\left( { - \frac{Q}{{RT}}} \right)}}.$$ During an infinitesimallv small time step, this rate refers to the”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

< 0 for the system and the surrounding is the correct answer to “The entropy change, for a spontaneous process is”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

Both A and B is the correct answer to “The expression of chemical potential for binary real solution having components A and B are”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

C + 1 is the correct answer to “In a homogenous system (with C as the number of components) in equilibrium, the total number of independent intensive thermodynamic variable is”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

$$\left( {\frac{1}{{{C_A}}}} \right) - \left( {\frac{1}{{{C_{AO}}}}} \right) = K.t$$ is the correct answer to “For a reaction A ⟶ B, if the rate of change in concentration of A (C A ), can be written as $$\frac{{ - dCA}}{{dt}} = k.C_A^2,$$ then the change concentration with time from initial concentration of A, Cao is given by”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

All are correct is the correct answer to “What are the ways through atoms can move inside the materials”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

dA = - PdV - SdT is the correct answer to “Maxwell equation $${\left( {\frac{{\partial P}}{{\partial T}}} \right)_V} = {\left( {\frac{{\partial S}}{{\partial V}}} \right)_T}$$ is produced from which of the following equation”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

0.48 is the correct answer to “The activity coefficient of Q in a liquid Q - R alloy is represented by the following equation at a given temperature. In γ Q = 0.6x 2 R - 0.2.x 3 R What is the activity of Q in an alloy of composition XR = 0.6 at the same temperature”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

P-4, Q-3, R-2, S-1 is the correct answer to “Match the following: Group 1 Group 2 P. Debye temperature 1. Rate constant Q. State property 2. Specific heat R. Thermodynamic probability 3. Internal energy S. Activation energy 4. Microstate in a macrostate”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

P-3, Q-2, R-4, S-1 is the correct answer to “Match the following: Group 1 Group 2 P. Volume 1. State function Q. Temperature 2. Intensive property R. Work done 3. Extensive property S. Molar entropy 4. Path dependent”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

$$\left( {\frac{{\partial G}}{{\partial {n_1}}}} \right)S,p,{n_2}$$ is the correct answer to “Chemical potential of a component 1 in a binary solution can be defined as”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

Change in entropy zero is the correct answer to “The oxidation reaction lines of metals/nonmetals parallel to x- axis in Ellingham diagram is corresponds to”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

Less than 1000°C is the correct answer to “What is the temperature range for CO where it can act as reducing agent for iron oxide reduction”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

depends on the choice of the standard state is the correct answer to “The activity of pure hydrogen gas at 1000°C and 5 atm. pressure.”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

zeroth is the correct answer to “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.”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

increase is the correct answer to “As the temperature increases, the solubility of gas in molten metal . . . . . . . . at constant pressure”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

Zero order reaction is the correct answer to “A chemical reaction whose rate does not depend on concentration of reactants is called”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

8314 is the correct answer to “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.”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

can be determined from the stoichiometry of the reaction is the correct answer to “The erder of a chemical reaction”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

can be written solely in terms of those species which occur only in the gas phase is the correct answer to “In reaction equilibria occuring between pure condensed phases and a gas phase, the equilibrium constant, K”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

Heat of combustion is the correct answer to “When one mole of the substance is completely burnt in oxygen. The heat evolve is known”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

Q is the correct answer to “If 'Δx' represents adherent oxide layer thickness and 't' is time, which of the following curves represents diffusion controlled oxidation kinetics”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

2.3 is the correct answer to “The reduction of FeO with CO gas in co-current flow is given by the following equation: FeO + CO = Fe + CO 2 , ΔG° = 8120 J at 1173K The ratio of pco/pco 2 for this reaction at 1173K is”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

Pzn = Pco + 2Pco2 is the correct answer to “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) = CO 2 (g) + C(s) Assume ideal gas behaviour. Based on mole balance, the relationship applicable to the system at equilibrium is”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

90,000 is the correct answer to “For the irreversible reaction, Ca + C = CaC 2 , 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.”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

$${t_{\frac{1}{2}}} = \frac{1}{{K\left[ {{A_0}} \right]}}$$ is the correct answer to “The half-life period for second order reactions is given as”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

dU = δq - δW is the correct answer to “The expression for first law of thermodynamics”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

decreases with temperature is the correct answer to “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”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

ΔS° = 0, ΔE° = 0 is the correct answer to “At absolute zero temperature, for any reaction involving condensed phases”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

$$ - \frac{{d{G_m}}}{{dxj}}$$ is the correct answer to “In a binary system, the difference in chemical potentials of two components (μi - μj) is equal to”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

- R In 0.5 is the correct answer to “One mole of element P is mixed with one mole of element Q. The entropy of jnixing at 0°K is”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.