Chemical Engineering Thermodynamics

441. Trouton's ratio is given by (where λ_b, = molal heat of vaporisation of a substance at its normal boiling point, kcal/kmol T_b = normal boiling point, °K)

1. λ_b/T_b
2. Tb/λ_b
3. √(λ_b/T_b)
4. √(T_b/λ_b)

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442. Trouton's ratio of _________ liquids is calculated using Kistyakowsky equation.

1. Polar
2. Non-polar
3. Both (A) & (B)
4. Neither (A) nor (B)

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443. Two substances are in equilibrium in a reversible chemical reaction. If the concentration of each substance is doubled, then the value of the equilibrium constant will be

1. Same
2. Doubled
3. Halved
4. One fourth of its original value

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444. Van Laar equation deals with the activity co-efficients in

1. Binary solutions
2. Ternary solutions
3. Azeotropic mixture only
4. None of these

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445. Vapour which is at a pressure smaller than the saturation pressure for the temperature involved is called a _________ vapour.

1. Superheated
2. Desuperheated
3. Non-condensable
4. None of these

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446. Variation of equilibrium pressure with temperature for any two phases of a given substances is given by the _________ equation.

1. Gibbs-Duhem
2. Maxwell's
3. Clapeyron
4. None of these

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447. Water on heating from 1 to 4°C

1. Contracts
2. Expands
3. Has same volume
4. May contract or expand

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448. What happens in a reversible adiabatic compression?

1. Heating occurs
2. Cooling occurs
3. Pressure is constant
4. Temperature is constant

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449. What happens in a reversible adiabatic expansion process?

1. Heating takes place
2. Cooling takes place
3. Pressure is constant
4. Temperature is constant

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450. What is the degree of freedom for a system comprising liquid water equilibrium with its vapour?

1. 0
2. 1
3. 2
4. 3

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