Metallurgical Thermodynamics And Kinetics — Part 2 MCQs with Explanations

$$K{\left( {P{N_2}} \right)^{\frac{1}{2}}}$$ is the correct answer to “The weight % of nitrogen (N 2 ) in liquid iron can be expressed as:”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

Both A and C is the correct answer to “The ratio of fugacity of the substance to the fugacity in its standard state”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

-1550 is the correct answer to “Melting point of a metal is 1356 K. When the liquid metal is undercooled to 1256 K, the free energy change for solidification, ΔG L-S = - 1000 J mol -1 . On the other hand, if the liquid metal is undercooled to 1200 K, the free energy change (in J mol -1 ) for solidification is”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

increases is the correct answer to “For a spontaneous natural process at constant temperature and pressure, the free energy of the system always”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

Rate = K[A] is the correct answer to “The rate of reaction for first order reaction”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

142.7 is the correct answer to “Decomposition of calcium carbonate occurs as: CaCO 3 = CaO + CO 2 : ΔG 0 T = 17710 - 158T J. mol -1 What will be the decomposition temperature (in K) of CaCO 3 , if the activity of CaO is 0.5 and the pressure is 3 atmospheres”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

P or, Q or, R is the correct answer to “Roasting of a metallic sulfide MS in pure oxygen is carried out at a particular temperature where the probable stable solid phases are M, MS, MO and MSO 4 . In case the system attains equilibrium and thus satisfies phase rule, it is possible to obtain a combination of the following solid phases in the roasted product. P. M, MS and MO Q. M, MS, MO and MSO 4 R. MSO 4 , MS and MO S. MS and MO”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

$${\left( {\frac{{\partial V}}{{\partial T}}} \right)_p} = - {\left( {\frac{{\partial S}}{{\partial P}}} \right)_T}$$ is the correct answer to “G = U + PV - TS. Then which one of the following is correct”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

$$ - \frac{{4Y}}{{\Delta g}}$$ is the correct answer to “In case of homogenous nucleation, the critical edge length for a cubed shaped nucleus is (Y : Energy per unit area of interface between the product and the parent phase; Δg : Gibbs free energy change per unit volume)”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

Thermal equilibria is the correct answer to “When there is existence of uniform temperature throughout the system is called”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

$${X_i} = \frac{{{P_i}}}{{{P_T}}}$$ is the correct answer to “The Daltons law of partial pressure can be written as”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

$$G_i^\alpha = G_i^\beta $$ is the correct answer to “When two phases α and β in an alloy are in thermodynamic equilibrium, then”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

R In 2 is the correct answer to “Consider an ideal solution of component A and B. The entropy of mixing per mole of an alloy containing 50 wt% B, is”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

$$\frac{1}{{28}}$$ is the correct answer to “The hydrogen content of steel in equilibrium with hydrogen gas at 1 bar pressure is 28 ppm at some temperature. Hydrogen content in the metal at the same temperature gets reduced at 1 ppm, when the equilibrium PH 2 changes to . . . . . . . . bar.”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

R is the correct answer to “For an ideal gas, Cp - Cv is”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

1.22 × 10-12 is the correct answer to “At 1200°C, the standard Gibbs energy of thermal decomposition of one mole of wustite into Fe and O 2 is 168 J. The corresponding dissociation pressure (in atm.) is”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

a lower concentration and lower chemical potential to higher concentration and higher chemical potential is the correct answer to “Uphill diffusion means diffusion from”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

Q is the correct answer to “Select the correct plot of Gibbs free energy (G) Vs. Temperature (T) for a single component system from the following:”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

the surrounding is the correct answer to “The part of the universe excluding the system is known as”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

frequency of breakdown of intermediate product is the correct answer to “Reaction between A and B results in an intermediate complex AB* which leads to the final product AB as, A + B ⟶ AB* ⟶ AB. Collision rate theory views the rate as dependent on”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

All are correct is the correct answer to “The formulae for change in entropy”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

Infinite is the correct answer to “Critical value of the Gibbs energy of nucleation at equilibrium temperature is”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

both A and B is the correct answer to “The constant term "2" in mathematical expression for phase rule is stands for”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

447.5 K is the correct answer to “Consider a reaction with activation energy of 8.314 kJ/mol that takes place at 300 K. If the reaction rate is to be tripled, the temperature of the reaction should be”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

combined mass transfer of H2 and H2O is the correct answer to “During the reduction of an oxide of hydrogen gas, it is observed that the rate of reaction increases by almost three fold due to a slight increases in temperature. The most likely rate controlling step is”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

$$\left( {\frac{{\delta G}}{{\delta {n_1}}}} \right)P,V,{n_2},{n_3}...$$ is the correct answer to “The chemical potential of a component 1 in a solution is given by, μi =”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

$$ - \frac{1}{V}{\left( {\frac{{\partial V}}{{\partial P}}} \right)_T}$$ is the correct answer to “Isothermal compressibility of a material is given by”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

quasi-static process is the correct answer to “The process in which all small steps are in equilibrium, so that entire process is in equilibrium is”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

1723.5 is the correct answer to “pure nickel melts at 1726K at 10 5 Pa (1 atm.) pressure, ΔV (solid-liquid) = 0.26 × 10 -6 m 3 . mol -1 and the heat of fusion, ΔHf = 18000 J.mol -1 . The melting point of pure nickel, when acted upon by a pressure of 10 8 Pa is . . . . . . . . K.”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

2 is the correct answer to “What will be the degree of freedom for single phase system of binary system”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

volume is the correct answer to “Which one of the following is not an intensive property”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

In k versus $$\frac{1}{T}$$ is the correct answer to “Activation energy of a chemical reaction, homogeneous or heterogeneous, is graphically estimated from a plot between”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

544 is the correct answer to “2cu(s) + 0.5 O 2 (g) = Cu 2 O(s); ΔG° = - 162200 + 69.24 T, J 2Cu(l) + 0.5 O 2 (g) = CU 2 O(s); ΔG° = - 1188300 + 88.48 T, J The molar free energy/change at 1300 K for the transformation of solid Cu to liquid Cu will be . . . . . . . . J.”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

$$ - {\left( {\frac{{\partial V}}{{\partial T}}} \right)_P}$$ is the correct answer to “Which of the following partial derivative is equal to $${\left( {\frac{{\partial S}}{{\partial P}}} \right)_T}?$$”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

$${\left( {\frac{{\partial H}}{{\partial T}}} \right)_p}$$ is the correct answer to “Heat capacity at constant pressure is defined by”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

first law of thermodynamics is the correct answer to “In thermodynamics, the law of conservation of energy is expressed in the form of”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

solid is the correct answer to “Which of the following phase will have lowest entropy”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

dE = δQ - δW is the correct answer to “The first law of thermodynamics can be stated as:”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

- 19250 x2zn is the correct answer to “Integral enthalpy of mixing (in J/mol) of liquid (Cu, Zn) solution can be approximated by ΔH m mix = - 19250 X Cu X Zn The corresponding partial molar enthalpy of mixing (in J/mol) for Cu is”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.

cyclic process is the correct answer to “The sequence of processes which return back to its initial point is called”. This question is standard in competitive examination syllabi for Metallurgical Thermodynamics And Kinetics.