Metallurgical Thermodynamics And Kinetics MCQ
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For any given partial pressure of CO over liquid steel at a constant temperature, the activities of carbon and oxygen in the metal are related to a constant β as
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The effect of temperature and pressure on chemical equilibrium can be predicted by
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If a multicomponent heterogeneous system at thermodynamic equilibrium, identify the option that need not be true.
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In BOF, desiliconisation is a first order reaction. So, the silicon content of the metal decreases
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In which of the following reactions, application of vaccum will help?
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Consider the equilibrium A(g) + B(g) = AB(g). When the partial pressure of A is 10<sup>-2</sup> atm; the partial pressure of B is 10<sup>-3</sup> atm and the partial pressure of AB is 1 atm; the equilibrium constant K is
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For the following reactions, the standard free energy change is given at 1773 K as follows:<br>$$\frac{2}{3}$$ Cr<sub>2</sub>O<sub>2</sub>(s) = $$\frac{4}{3}$$ Cr(s) + O<sub>2</sub>(g)<br>ΔG° = 447800 J<br>2H<sub>2</sub>(g) + O<sub>2</sub>(g) = 2H<sub>2</sub>O(g)<br>ΔG° = - 297000 J<br>If chromium oxide powder has to be reduced by hydrogen in a fludised bed, the minimum $$\frac{{P{H_2}}}{{P{H_0}}}$$ ratio that has to be maintained at the exit of the reactor is
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Configurational entropy due to ideal mixing in a binary A - B system is expressed as:<br>ΔS<sub>mix</sub> = - R(X<sub>A</sub> In X<sub>A</sub> + X<sub>B</sub> In X<sub>B</sub>),<br>where X<sub>A</sub> and X<sub>B</sub> are mole fractions of A and B respectively.<br>ΔS<sub>mix</sub> is maximum at X<sub>A</sub> = . . . . . . . .
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If a solid is compressed adiabatically in its elastic range, its
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The portion or quantity of the universe/matter that is selected for study are separated from surrounding is
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For a binary solution A - B, the α-function is given by $$\alpha = \frac{{\exp \left( x \right) - 1}}{X}$$ Where, X is the mole fraction of component A. The limiting value of a when X approaches zero, is
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The concentration of a dissolved gas is directly proportional to the partial pressure of that gas
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The activation energy for a reaction is 100 kJ/mole. The approximate increase in temperature required for doubling the rate of reaction from that at 25°C, is . . . . . . . . °C.
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Consider the reaction:<br>Fe<sub>3</sub>O<sub>4</sub> (solid, pure) + CO (gas, 1 atm) → 3FeO (solid, pure) + CO<sub>2</sub> (gas, 1 atm)<br>For this reaction, ΔG<sub>1200</sub> = -8000 joules per mole of CO and R = 8.314 J mol<sup>-1</sup> K<sup>-1</sup>.<br>The equilibrium ratio, $$\frac{{pc{o_2}}}{{pco}}$$ reaction at 1200 K and 1 atm is . . . . . . . .
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For the reaction, A = X + Y, the respective concentrations are C<sub>A</sub>, C<sub>X</sub> and C<sub>Y</sub>. The forward reaction rate constant is kf and the backward reaction rate constant is kb. Choose the correct statement from the following:<br>P. At equilibrium, kf C<sub>A</sub> > k<sub>B</sub> CxCy<br>Q. If the reaction is irreversible than, kb C<sub>X</sub>C<sub>Y</sub> = 0<br>R. The backward reaction rate will essentially be first order, if the forward reaction rate is first order.<br>S. Activation energy for the first order forward reaction will be independent of temperature.
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The heat capacity of diatomic ideal gas
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AG<sub>(s)</sub> = Ag<sub>(t)</sub>, T = 1234K; ?H = 11300 J.mol<sup>-1</sup> ?C<sub>P</sub> = Cp<sub>(t)</sub> - Cp<sub>(s)</sub> = 0<br>When one mole of super cooled liquid silver freezes at an ambient temperature of 1000 K, the total entropy change of the system (Ag) and the surroundings is . . . . . . . . J.K<sup>-1</sup>.
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FeO(s) + CO(g) = Fe(s) + CO<sub>2</sub>(g); K = 0.435 at 1173 K. At equilibrium, what will be the number of moles of CO gas required to reduce one mole of FeO at 1173K?
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Which of the following- properties is Intensive?
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For a first order chemical reaction the concentration of the reactant decreases
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As the concentration of point defects in a crystal increases, its configurational entropy
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The limiting condition for the appearance of the miscibility gap in a binary solution is<br>Where, G is the Gibbs free energy and X is the mole fraction of component Z.
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The expression for gas law is
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The activity co-efficient of the solute in a dilute solution
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The units of the rate constant for it second order reaction are
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The vapour pressure of a solid M varies with temperature T in K, as<br>In p(atm) = $$frac{{ - 33,200}}{T}$$ - 0.85 In T + 21.46<br>The vapour pressure of liquid M varies with temperature T, in K, as<br>In p (atm) $$frac{{ - 33,200}}{T}$$ = 0.85 In T + 20.31<br>The temperature of the triple point of M, in K is
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If a binary system exihibits a miscibility gap in the solid state, then the enthalpy of mixing in the solid state, ΔH<sup>mix</sup> should necessarily be
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The sequence of processes which return back to its initial point is called
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Integral enthalpy of mixing (in J/mol) of liquid (Cu, Zn) solution can be approximated by ΔH<sub>m</sub><sup>mix</sup> = - 19250 X<sub>Cu</sub>X<sub>Zn</sub><br>The corresponding partial molar enthalpy of mixing (in J/mol) for Cu is
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The first law of thermodynamics can be stated as: