What is the correct answer?

4

# The second law of thermodynamics states that

The energy change of a system undergoing any reversible process is zero

It is not possible to transfer heat from a lower temperature to a higher temperature

The total energy of system and surrounding remains the same

None of the above

### Correct Answer :

D. None of the above

### Related Questions

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4

# Gibbs-Helmholtz equation is

ΔF = ΔH + T [∂(ΔF)/∂T]P

ΔF = ΔH - TΔT

d(E - TS) T, V < 0

dP/dT = ΔHvap/T.ΔVvap

What is the correct answer?

4

# In case of vapour compression refrigeration system, elevating the evaporator temperature (keeping the condenser temperature constant) results in

Enhanced COP

Decreased COP

No change in the value of COP

Increased or decreased COP; depending upon the type of refrigerant

What is the correct answer?

4

# Charles' law for gases states that

V/T = Constant

V ∝ 1/T

V ∝ 1/P

PV/T = Constant

What is the correct answer?

4

# For an ideal solution, the value of activity co-efficient is

0

1

< 1

> 1

What is the correct answer?

4

# (1/V) (∂V/∂T)P is the mathematical expression

Joule-Thomson co-efficient

Specific heat at constant pressure (Cp)

co-efficient of thermal expansion

Specific heat at constant volume (CV)

What is the correct answer?

4

# What is the ratio of adiabatic compressibility to isothermal compressibility?

1

< 1

> 1

>> 1

What is the correct answer?

4

# Domestic refrigerator usually works on the __________ refrigeration cycle.

Carnot

Air

Absorption

vapour-ejection

What is the correct answer?

4

# The reaction A (l) → R(g) is allowed to reach equilibrium conditions in an autoclave. At equilibrium, there are two phases, one a pure liquid phase of A and the other a vapor phase of A, R and S. Initially A alone is present. The numbers of degrees of freedom are:

1

2

3

0

What is the correct answer?

4

# The gas law (PV = RT) is true for an __________ change.

Isothermal

Both (A) & (B)

Neither (A) nor (B)

What is the correct answer?

4

# Work done may be calculated by the expression ∫ p dA for __________ processes.

Non-flow reversible

Both (A) and (B)

Neither (A) nor (B)

What is the correct answer?

4

# The expression for the work done for a reversible polytropic process can be used to obtain the expression for work done for all processes, except reversible __________ process.

Isobaric

Isothermal

None of these

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4

# Heat is added at constant temperature in an ideal __________ cycle.

Stirling

Brayton

Rankine

None of these

What is the correct answer?

4

# Heat of reaction at constant volume is identified with __________ change.

Enthalpy

Internal energy

Either (A) or (B)

Neither (A) nor (B)

What is the correct answer?

4

# Pick out the correct statement.

Entropy and enthalpy are path functions

In a closed system, the energy can be exchanged with the surrounding, while matter cannot be exchanged

All the natural processes are reversible in nature

Work is a state function

What is the correct answer?

4

# What is the number of degree of freedom for a system of two miscible non-reacting species in vapor-liquid equilibrium forming an azeotrope?

0

2

1

3

What is the correct answer?

4

# Pick out the correct statement.

A real gas on expansion in vacuum gets heated up

An ideal gas on expansion in vacuum gets cooled

An ideal gas on expansion in vacuum gets heated up

A real gas on expansion in vacuum cools down whereas ideal gas remains unaffected

What is the correct answer?

4

# The chemical potential of any constituent of an ideal solution depends on the __________ of the solution.

Temperature

Pressure

Composition

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

What is the correct answer?

4

# The enthalpy change when ammonia gas is dissolved in water is called the heat of

Solution

Formation

Dilution

Combustion

What is the correct answer?

4

# Specific volume of an ideal gas is

Equal to its density

The reciprocal of its density

Proportional to pressure

None of these

What is the correct answer?

4

# Van Laar equation deals with the activity coefficients in

Binary solutions

Ternary solutions

Azeotropic mixture only

None of these

What is the correct answer?

4

# While dissolving a gas into a liquid at a constant temperature, the ratio of the concentration of the gas in the solution phase and in the gaseous phase is

Infinity

Unity

Constant

Negative

What is the correct answer?

4

# Dry ice is

Moisture free ice

Solid helium

Solid carbon dioxide

None of these

What is the correct answer?

4

# Entropy of the system decreases, when

Snow melts into water

A gas expands spontaneously from high pressure to low pressure

Water is converted into ice

Both (B) & (C)

What is the correct answer?

4

# Trouton's ratio of __________ liquids is calculated using Kistyakowsky equation.

Polar

Non-polar

Both (A) & (B)

Neither (A) nor (B)

What is the correct answer?

4

# During the phase transition, __________ changes.

Pressure

Volume

Temperature

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

What is the correct answer?

4

# When a gas is subjected to adiabatic expansion, it gets cooled due to

Decrease in velocity

Decrease in temperature

Decrease in kinetic energy

Energy spent in doing work

What is the correct answer?

4

# Pick out the wrong statement.

System (of partially miscible liquid pairs), in which the mutual solubility increases with rise in temperature, are said to possess an upper consolute temperature

Systems, in which the mutual solubility increases with decrease in temperature, are said to possess lower consolute temperature

Nicotine-water system shows both an upper as well as a lower consolute temperature, implying that they are partially miscible between these two limiting temperatures

None of these

What is the correct answer?

4

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

Gibbs-Duhem

Maxwell's

Clapeyron

None of these

What is the correct answer?

4

# A large iceberg melts at the base, but not at the top, because of the reason that

Ice at the base contains impurities which lowers its melting point

Due to the high pressure at the base, its melting point reduces

The iceberg remains in a warmer condition at the base

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

What is the correct answer?

4

Heat pump

Heat engine

Carnot engine

None of these