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1. The melting point of water is 0oC at 1 atm pressure because under these conditions:
DS for the process H2O(s)--> H2O(l) is positive.
DS and DSsurr for the process H2O(s)--> H2O(l) are both positive.
DS and DSsurr for the process H2O(s)--> H2O(l) are equal in magnitude and opposite in sign.
DG is positive for the process H2O(s)--> H2O(l).
None of these is correct.

2. Choose the correct statement.
Exothermic reactions are always spontaneous
High temperature ensures a spontaneous reaction
Free energy is independent of temperature
A reaction with negative DS cannot be spontaneous
none of the above

3. Which of the following will be true when a pure substance in liquid phase freezes spontaneously?
DG, DH, and DS are all positive
DG, DH, and DS are all positive

4. Which statement is TRUE?
DS decreases with an increase in volume
free energy is independent of volume
free energy is independent of pressure
free energy is dependent on pressure
none of the above

5. Choose the CORRECT statement:
Exothermic reactions are always spontaneous
Free energy is independent of temperature.
A reaction which exhibits a negative value of D S cannot be spontaneous.
At constant P and T, a decrease in free energy insures an increase in the entropy of the system.
None of the above statements are true.

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