Assertion(A): Molar entropy of vaporization of water is different from ethanol.
Reason(R): Water is more polar than ethanol.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true and R is false.
4. A and R both are false.
Subtopic:  Thermochemistry |
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Assertion(A): The temperature of a gas does not change, when it undergoes an adiabatic expansion.
Reason(R): During an adiabatic process, the container should be a perfect conductor.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true and R is false.
4. A and R both are false.
Subtopic:  Thermochemistry |
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Assertion(A): The enthalpy of formation of gaseous oxygen molecules at 298 K under a pressure of one atm is zero.
Reason(R): The entropy of the formation of gaseous oxygen molecules under the same conditions is zero.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true and R is false.
4. A and R both are false.
Subtopic:  Thermochemistry |
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Assertion(A): Enthalpy of graphite is lower than that of a diamond.
Reason(R): Entropy of graphite is greater than that of a diamond.

1. Both A and R are true and R is the correct explanation of A.
2. Both A and R are true but R is not the correct explanation of A.
3. A is true and R is false.
4. A and R both are false.
 
Subtopic:  Thermochemistry |
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Assertion: Combustion is an exothermic process.

Reason: Combustion is a spontaneous process.

1. Both assertion & reason are true and the reason is the correct explanation of the assertion.

2. Both assertion & reason are true but the reason is not the correct explanation of the assertion.

3. Assertion is a true statement but reason is false.

4. Both assertion and reason are false statements.

Subtopic:  Thermochemistry |
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Assertion: Combustion of all organic compounds is an exothermic reaction.

Reason: The enthalpies of all elements in their standard state are zero.

1.  Both assertion and reason are true and the reason is the correct explanation of assertion.

2.  Both assertion and reason are true and the reason is not the correct explanation of assertion.

3.  Assertion is true but the reason is false.

4.  Assertion is false but the reason is true.

Subtopic:  Thermochemistry |
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Statement I: The standard enthalpy change for the formation of one mole of a compound from its elements in their most stable states (reference states) is called standard molar enthalpy of formation.
Statement II:  For, CaO(s)+ CO2 (g) → CaCO3(s) ;   ∆fH = -178.3   kJmol-1 , the ∆rH is equal to the ∆fH


1. Both statements I and II are true.
2. Statement I is true and statement II is false.
3. Both statement I and II are false.
4. Statement I is false, statement II is true.

Subtopic:  Thermochemistry |
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