# Free energy is related to enthalpy and entropy changes as

1.  ΔG=ΔH-TΔS

2.  ΔG=TΔS-ΔH

3.  ΔG=ΔH-Δs/T

4.  ΔG=ΔH+TΔS

4

ΔG=ΔH-TΔS

Explanation :
No Explanation available for this question

# Which of the following relations holds good to the laws of thermodynamics for the reaction C2H4(l)+3O2(g)→2CO2(g)+2H2O(l)

1.  ΔH=ΔU+RT

2.  ΔH=ΔU-RT

3.  ΔH=ΔU+2RT

4.  ΔH=ΔU-2RT

4

ΔH=ΔU-RT

Explanation :
No Explanation available for this question

# The enthalpies of formation of N2O and NO at 298 K are 82 and 90kJ mol-1. The enthalpy of the reaction: N2O(g)+12O2(g)→2NO(g)is

1.  -8 kJ

2.  98 kJ

3.  -74 kJ

4.  8 kJ

4

98 kJ

Explanation :
No Explanation available for this question

# For the reaction, PCl5(g)→PCl3(g)+Cl2(g)

1.  ΔH=ΔU

2.  ΔH>ΔU

3.  ΔH

4.  None of the above

4

ΔH>ΔU

Explanation :
No Explanation available for this question

# The enthalpies of combution of carbon and carbon monoxide are -393.5and -283kJ mol-1 respectively. The enthalpy of formation of carbon monoxide is

1.  110.5 kJ mol-1

2.  676.5 kJ mol-1

3.  -676.5 kJ mol-1

4.  -110.5 kJ mol-1

4

-110.5 kJ mol-1

Explanation :
No Explanation available for this question

# The molar heat of vaporisation for water is 9.72 kcal mol-1. The amount of heat change when 45g of water condense is

1.  437.4 kcal

2.  24.3 kcal

3.  243 kcal

4.  3.89 kcal

4

24.3 kcal

Explanation :
No Explanation available for this question

# Calculate the heat of the reaction :CH2=CH2(g)H2(g)→CH3CH3(g)given that bond energy of C-C,C=C,C-H and H-H is 80,145,98and 103kcal

1.  -28 kcal mol-1

2.  -5.6 kcal mol-1

3.  -2.8 kcal mol-1

4.  -5.6 kcal mol-1

4

-28 kcal mol-1

Explanation :
No Explanation available for this question

# For which of the following reaction, ΔS is not positive

1.  I2(s)→I2(g)

2.  CuO(s)+H2(g)→Cu(s)+H2O(l)

3.  2O3(g)→3O2(g)

4.  CH4(g)+2O2(g)→CO2(g)+H2O(g)

4

CuO(s)+H2(g)→Cu(s)+H2O(l)

Explanation :
No Explanation available for this question

# The latent heat of vaporisation of water at 1000Cis 2257J/g. The ΔH for the process H2O(g)→H2O(l) is very nearly

1.  +2257 J

2.  -2257 J

3.  +40.7 kJ

4.  -40.7 kJ

4

-40.7 kJ

Explanation :
No Explanation available for this question

# The change in entropy of an ideal gas during a reversible isothermal expansion is

1.  Negative

2.  Positive

3.  Zero

4.  Infinite

4

Positive

Explanation :
No Explanation available for this question

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