The weight % of nitrogen (N2) in liquid iron can be expressed as:
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Metallurgical Engineering · all questionsMetallurgical Thermodynamics and Kinetics
Metallurgical Thermodynamics and Kinetics
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The ratio of fugacity of the substance to the fugacity in its standard state
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Melting point of a metal is 1356 K. When the liquid metal is undercooled to 1256 K, the free energy change for solidification, ΔGL-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
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For a spontaneous natural process at constant temperature and pressure, the free energy of the system always
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The rate of reaction for first order reaction
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Decomposition of calcium carbonate occurs as:
CaCO3 = CaO + CO2 : ΔG0T = 17710 - 158T J. mol-1
What will be the decomposition temperature (in K) of CaCO3, if the activity of CaO is 0.5 and the pressure is 3 atmospheres?
CaCO3 = CaO + CO2 : ΔG0T = 17710 - 158T J. mol-1
What will be the decomposition temperature (in K) of CaCO3, if the activity of CaO is 0.5 and the pressure is 3 atmospheres?
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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 MSO4. 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 MSO4
R. MSO4, MS and MO
S. MS and MO
P. M, MS and MO
Q. M, MS, MO and MSO4
R. MSO4, MS and MO
S. MS and MO
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G = U + PV - TS. Then which one of the following is correct?
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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)
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When there is existence of uniform temperature throughout the system is called
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The Daltons law of partial pressure can be written as
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When two phases α and β in an alloy are in thermodynamic equilibrium, then
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Consider an ideal solution of component A and B. The entropy of mixing per mole of an alloy containing 50 wt% B, is
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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 PH2 changes to . . . . . . . . bar.
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For an ideal gas, Cp - Cv is
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At 1200°C, the standard Gibbs energy of thermal decomposition of one mole of wustite into Fe and O2 is 168 J.
The corresponding dissociation pressure (in atm.) is
The corresponding dissociation pressure (in atm.) is
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Uphill diffusion means diffusion from
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Select the correct plot of Gibbs free energy (G) Vs. Temperature (T) for a single component system from the following:
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The part of the universe excluding the system is known as
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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
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