GATE XE Thermodynamics, Kinetics and Phase Transformations PYQs & Answers — Page 2

Questions 11–20 of 53. Imported answers require independent review unless marked reviewed.

The standard free energy change for the reaction,

at equilibrium is given by

, where T is in Kelvin and

is in Joule. The equilibrium constant (

) at 1050 K is (rounded off to two decimal places) ____________

Given: Universal gas constant (R) = 8.314 J K

mol

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The slopes of reduction potential versus pH plots for the two reactions,

and

, at 298 K and one atmospheric pressure are

and

, respectively. The ratio

is (rounded off to one decimal place) ____________

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At 873 K, hydrogen diffuses under steady state condition through a 5 mm thick palladium sheet with a cross-sectional area of 0.3 m

. The concentrations of hydrogen at high and low pressure ends of the sheet are 3 kg m

and 0.5 kg m

, respectively. The amount of hydrogen (in kg per day) passing through the sheet is (rounded off to two decimal places) ____________

Given: At 873 K, diffusivity of hydrogen =

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The correct combination of phases in the one-component H

O phase diagram, as given below, is

Diagram for Engineering Sciences question 44

Your answerChoose one option.

α – water; β – vapour; γ – ice

α – ice; β – water; γ – vapour

α – vapour; β – ice; γ – water

α – water; β – ice; γ – vapour

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The work done by a body expanding from an initial state A to the final state B, as shown in the P-V diagram below, is (in units of litre-atm) __________ (rounded off to nearest integer).

Diagram for Engineering Sciences question 52

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A binary phase diagram is given below.

Diagram for Engineering Sciences question 53

Which one of the following figures qualitatively represents the G-X (Gibbs free energy – composition) plot at temperature

shown in the phase diagram?

Your answerChoose one option.

Diagram for Engineering Sciences question 53 (figure 2)

Diagram for Engineering Sciences question 53 (figure 3)

Diagram for Engineering Sciences question 53 (figure 4)

Diagram for Engineering Sciences question 53 (figure 5)

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Which of the following options is/are true for glass transition temperature T_g?

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

Above T_g, glass transforms from an amorphous solid to a viscous liquid.

At T_g, glass transforms from an amorphous solid to a crystalline solid.

T_g is dependent on the heating rate.

Below T_g, nucleation and growth takes place in glass.

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Given that k is the first order reaction rate constant and T is the temperature in absolute scale, the temperature dependence of rate constant is/are represented by

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

Diagram for Engineering Sciences question 60

Diagram for Engineering Sciences question 60 (figure 2)

Diagram for Engineering Sciences question 60 (figure 3)

Diagram for Engineering Sciences question 60 (figure 4)

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A 2 mm thick palladium sheet of 1000 mm

cross section is used as a diffusional membrane to purify hydrogen. The hydrogen concentration is maintained at a steady state with

kg m

and

kg m

on the two sides of the membrane as shown in the figure below.

Diagram for Engineering Sciences question 63

The rate of hydrogen purification is (in units of kg hr

) ______ × 10

(rounded off to one decimal place).

Given: The diffusion coefficient of hydrogen in palladium is 1.0 × 10

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In age-hardening of an aluminium alloy, the purpose of solution treatment followed by quenching is to

Your answerChoose one option.

form martensitic structure

increase the size of the precipitates

form supersaturated solid solution

form precipitates at the grain boundaries

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GATE XE Thermodynamics, Kinetics and Phase Transformations PYQs

Question 62

Question 63

Question 64

Question 44

Question 52

Question 53

Question 58

Question 60

Question 63

Question 44