11th Chemistry Weekly Test - 2 ( Thermodynamics )

MABS Institution

11th Chemistry Weekly Test - 2 ( Thermodynamics )-Aug 2020

Time : 1.30 Hours

Part - A

Generic 2 - Answer All Question

Give Kelvin statement of second law of thermodynamics.

Predict the feasibility of a reaction when
(i) both ΔH and ΔS positive
(ii) both ΔH and ΔS negative
(iii) ΔH decreases but ΔS increases

Define the calorific value of food. What is the unit of calorific value?

Define enthalpy of neutralization

Define molar heat capacity. Give its unit

What is lattice energy?

State the third law of thermodynamics.

Define Hess's law of constant heat summation. (or) State Hess's law.

Identify the state and path function out of the following: a) Enthalpy b) Entropy c) Heat d) Temperature e) Work f) Free energy.

What is the usual definition of entropy? What is the unit of entropy?

Part - B

Generic 5 - Answer All Question

The boiling point of water at a pressure of 50 atm is 538 K. Compare the theoretical efficiencies of a steam engine operating between the boiling point of water at
(i) 1atm pressure
(ii) 50 atm pressure, assuming the temperature of the sink to be 350^°C in each case.

Calculate the standard entropy change for the following reaction (Δs_f⁰), given the standard entropies of CO_2(g) , C_(s) 'O_2(g) as 213.6, 5.740, and 205 JK^-1 respectively.

30.4 KJ is required to melt one mole of sodium chloride. The entropy change during melting is 28.4 JK^-1 mol^-1, Calculate the melting point of sodium chloride.

A gas mixture of 3.67 lit of ethylene and methane on complete combustion at 25°C and at 1 atm pressure produce 6.11 lit of carbondioxide. Find out the amount of heat evolved in kJ, during this combustion. (ΔH_c(CH₄)= - 890 kJ mol^-1 and (ΔH_c(C₂H₄) = -1423 kJ mol^-1
Write down the conventions that are followed while framing a thermo chemical equation

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11th Chemistry Weekly Test - 2 ( Thermodynamics )

MABS Institution

11th Chemistry Weekly Test - 2 ( Thermodynamics )-Aug 2020

Part - A

Generic 2 - Answer All Question

Give Kelvin statement of second law of thermodynamics.

Predict the feasibility of a reaction when (i) both ΔH and ΔS positive (ii) both ΔH and ΔS negative (iii) ΔH decreases but ΔS increases

Define the calorific value of food. What is the unit of calorific value?

Define enthalpy of neutralization

Define molar heat capacity. Give its unit

What is lattice energy?

State the third law of thermodynamics.

Define Hess's law of constant heat summation. (or) State Hess's law.

Identify the state and path function out of the following: a) Enthalpy b) Entropy c) Heat d) Temperature e) Work f) Free energy.

What is the usual definition of entropy? What is the unit of entropy?

Part - B

Generic 5 - Answer All Question

The boiling point of water at a pressure of 50 atm is 538 K. Compare the theoretical efficiencies of a steam engine operating between the boiling point of water at (i) 1atm pressure (ii) 50 atm pressure, assuming the temperature of the sink to be 350°C in each case.

Calculate the standard entropy change for the following reaction (Δsf0), given the standard entropies of CO2(g) , C(s) 'O2(g) as 213.6, 5.740, and 205 JK-1 respectively.

30.4 KJ is required to melt one mole of sodium chloride. The entropy change during melting is 28.4 JK-1 mol-1, Calculate the melting point of sodium chloride.

A gas mixture of 3.67 lit of ethylene and methane on complete combustion at 25°C and at 1 atm pressure produce 6.11 lit of carbondioxide. Find out the amount of heat evolved in kJ, during this combustion. (ΔHc(CH4)= - 890 kJ mol-1 and (ΔHc(C2H4) = -1423 kJ mol-1

Write down the conventions that are followed while framing a thermo chemical equation

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Predict the feasibility of a reaction when
(i) both ΔH and ΔS positive
(ii) both ΔH and ΔS negative
(iii) ΔH decreases but ΔS increases

The boiling point of water at a pressure of 50 atm is 538 K. Compare the theoretical efficiencies of a steam engine operating between the boiling point of water at
(i) 1atm pressure
(ii) 50 atm pressure, assuming the temperature of the sink to be 350^°C in each case.

Calculate the standard entropy change for the following reaction (Δs_f⁰), given the standard entropies of CO_2(g) , C_(s) 'O_2(g) as 213.6, 5.740, and 205 JK^-1 respectively.

30.4 KJ is required to melt one mole of sodium chloride. The entropy change during melting is 28.4 JK^-1 mol^-1, Calculate the melting point of sodium chloride.

A gas mixture of 3.67 lit of ethylene and methane on complete combustion at 25°C and at 1 atm pressure produce 6.11 lit of carbondioxide. Find out the amount of heat evolved in kJ, during this combustion. (ΔH_c(CH₄)= - 890 kJ mol^-1 and (ΔH_c(C₂H₄) = -1423 kJ mol^-1