What is the correct answer?

4

# What is the number of degrees of freedom for liquid water in equilibrium with a mixture of nitrogen and water vapor?

2

0

3

1

A. 2

### Related Questions

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4

# Isentropic process means a constant __________ process.

Enthalpy

Pressure

Entropy

None of these

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4

# Gibbs free energy (G) is represented by, G = H - TS, whereas Helmholtz free energy, (A) is given by, A = E - TS. Which of the following is the Gibbs-Helmholtz equation?

[∂(G/T)/∂T] = - (H/T2)

[∂(A/T)/∂T]V = - E/T2

Both (A) and (B)

Neither (A) nor (B)

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4

# For an ideal gas, the chemical potential is given by

RT d ln P

R d ln P

R d ln f

None of these

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4

# In case of a close thermodynamic system, there is __________ across the boundaries.

No heat and mass transfer

No mass transfer but heat transfer

Mass and energy transfer

None of these

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4

# Joule-Thomson effect i.e., a throttling process is a constant __________ process.

Entropy

Temperature

Internal energy

Enthalpy

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4

# Which law of the thermodynamics provides basis for measuring the thermodynamic property?

First law

Zeroth law

Third law

Second law

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4

# In an irreversible process

Tds = dE - dW = 0

dE - dW - Tds = 0

Tds - dE + dW < 0

Tds - dT + dW < 0

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4

# In a homogeneous solution, the fugacity of a component depends upon the

Pressure

Composition

Temperature

All (A), (B) and (C)

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4

# The Maxwell relation derived from the differential expression for the Helmholtz free energy (dA) is

(∂T/∂V)S = - (∂P/∂S)V

(∂S/∂P)T = - (∂V/∂T)P

(∂V/∂S)P = (∂T/∂P)S

(∂S/∂V)T = (∂P/∂T)V

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4

# The expression, nCv(T2 - T1), is for the __________ of an ideal gas.

Work done under adiabatic condition

Co-efficient of thermal expansion

Compressibility

None of these

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4

# Which of the following decreases with increase in pressure?

Melting point of ice

Melting point of wax

Boiling point of liquids

None of these

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4

# (∂H/∂T)P is the mathematical expression for

CV

Entropy change

Gibbs free energy

None of these

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4

# The expression for entropy change given by, ΔS = nR ln (V2/V1) + nCv ln (T2/T1) is valid for

Reversible isothermal volume change

Heating of a substance

Cooling of a substance

Simultaneous heating and expansion of an ideal gas

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4

# Which one is true for a throttling process?

A gas may have more than one inversion temperatures

The inversion temperature is different for different gases

The inversion temperature is same for all gases

The inversion temperature is the temperature at which Joule-Thomson co-efficient is infinity

What is the correct answer?

4

# Which of the following is not a reversible process?

Expansion of an ideal gas against constant pressure

Atmospheric pressure vaporisation of water at 100°C

Solution of NaCl in water at 50°C

None of these

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4

# In the reaction; N2 + O2 2NO, increasing the pressure will result in

Shifting the equilibrium towards right

Shifting the equilibrium towards left

No change in equilibrium condition

None of these

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4

# The number of degrees of freedom for an azeotropic mixture in a two component vapour-liquid equilibria is/are

Zero

One

Two

Three

What is the correct answer?

4

# When a system is in equilibrium for all possible processes, the differential or finite change of entropy is

< 0

> 0

= 0

None of these

What is the correct answer?

4

# For the gaseous phase chemical reaction, C2H4(g) + H2O(g) ↔ C2H5OH(g), the equilibrium conversion does not depend on the

Steam to ethylene ratio

Temperature

Pressure

None of these

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4

# Internal energy is equal to the heat absorbed in case of a/an __________ process.

Constant volume

Polytropic

Constant pressure

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4

# Compound having large heat of formation is

More stable

Less stable

Not at all stable (like nascent O2)

Either more or less stable; depends on the compound

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4

# For water at 300°C, it has a vapour pressure 8592.7 kPa and fugacity 6738.9 kPa Under these conditions, one mole of water in liquid phase has a volume of 25.28 cm3 and that in vapour phase in 391.1 cm3.Fugacity of water (in kPa) at 9000 kPa will be

6738.9

6753.5

7058.3

9000

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4

# The melting point of paraffin wax (which contracts on solidification) __________ with pressure rise.

Increases

Decreases

Remains unchanged

Decreases linearly

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4

# The amount of heat required to decompose a compound into its elements is __________ the heat of formation of that compound from its elements.

Less than

More than

Same as

Not related to

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4

# The equation, PV = nRT, is best obeyed by gases at

Low pressure & high temperature

High pressure & low temperature

Low pressure & low temperature

None of these

What is the correct answer?

4

# COP of a refrigerator drawing 1 kW of power per ton of refrigeration is about

0.5

3.5

4.5

8.5

What is the correct answer?

4

# __________ functions are exemplified by heat and work.

Path

Point

State

None of these

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4

# Pick out the correct statement.

Compression ratio of an Otto engine is comparatively higher than a diesel engine

Efficiency of an Otto engine is higher than that of a diesel engine for the same compression ratio

Otto engine efficiency decreases with the rise in compression ratio, due to decrease in work produced per quantity of heat

Diesel engine normally operates at lower compression ratio than an Otto engine for an equal output of work

What is the correct answer?

4

# Pick out the wrong statement.

The net change in entropy in any reversible cycle is always zero

The entropy of the system as a whole in an irreversible process increases

The entropy of the universe tends to a maximum

The entropy of a substance does not remain constant during a reversible adiabatic change

What is the correct answer?

4

# The change in Gibbs free energy for vaporisation of a pure substance is

Positive

Negative

Zero

May be positive or negative