GATE MT topic:laws-thermodynamics PYQs & Answers — Page 2

Questions 11–20 of 69. Imported answers require independent review unless marked reviewed.

Which one of the following is an intensive property?

Your answerChoose one option.

Chemical potential

Volume

Mass

Entropy

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Consider the following gas-phase reaction:

If the enthalpy of reaction is negative, which one of the following conditions promotes a higher equilibrium concentration of SO3?

Your answerChoose one option.

Higher pressure and higher temperature

Higher pressure and lower temperature

Lower pressure and higher temperature

Lower pressure and lower temperature

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Standard Gibbs free energies of formation of some solid oxides per mole of O₂ at 100 K are given below.

SiO₂: −728 kJ, TiO₂: −737 kJ, VO: −712 kJ, MnO: −624 kJ

Regarding thermodynamic feasibility of oxide reduction, which of the following statements is/are CORRECT under standard conditions at 1000 K?

Your answerSelect all correct options. You can choose more than one.

Si can reduce TiO₂.

Mn can reduce VO.

Ti can reduce MnO.

V can reduce SiO₂.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Consider the gas phase reaction:

At equilibrium for a particular temperature, the partial pressures of CO, O

, and CO

are found to be

atm,

atm, and 16 atm, respectively. The equilibrium constant for the reaction is _____

(rounded off to one decimal place).

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Consider the phase diagram of a one component system given below.

, and

are the molar volumes of

, and liquid phases, respectively. Which one of the following statements is TRUE? Given: The change in molar enthalpies,

and

, are positive.

Diagram for Metallurgical Engineering question 37

Your answerChoose one option.

and

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

The excess molar Gibbs free energy of a solution of element A and B at 1000 K is given by

, where

and

are mole fractions of A and B, respectively.

The activity of B in a solution of A and B containing 40 mol% of B at 1000 K is _____ (rounded off to two decimal places).

Given: Ideal gas constant R = 8.314 J mol

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Molten steel at 1900 K having dissolved hydrogen needs to be vacuum degassed.

The equilibrium partial pressure of hydrogen to be maintained to achieve 1 ppm (mass basis) of dissolved hydrogen is _____ Torr (rounded off to two decimal places).

Given: For the hydrogen dissolution reaction in molten steel (½ H

(g) = [H]), the equilibrium constant (expressed in terms of ppm of dissolved H) is:

1 atm = 760 Torr

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Consider the following reactions and their standard Gibbs free energies (in J):

Fe(s) +

(g) ⇌ FeO(s)

2 H

(g) + O

(g) ⇌ 2 H

O(g)

Assuming Fe and FeO to be pure and no solubility of gases in the solids, the value of

required to reduce solid FeO to solid Fe at 1000 K is _____ (rounded off to two decimal places).

Given: Ideal gas constant R = 8.314 J mol

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

If in an A-B solid solution, the activity and mole fraction of A are given by

and

, respectively, then the activity coefficient of A is given by

Your answerChoose one option.

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

Which of the following is/are criterion/criteria for equilibrium of an isolated system held at constant temperature and constant pressure?

Your answerSelect all correct options. You can choose more than one.

Entropy maximization

Entropy minimization

Maximization of Gibbs free energy

Minimization of Gibbs free energy

You can attempt this question now. Sign in to view the answer key, explanations and discussion.Log in to check answer

GATE MT topic:laws-thermodynamics PYQs

Question 15

Question 19

Question 30

Question 34

Question 37

Question 50

Question 51

Question 53

Question 14

Question 29