1. which of the following is true, NaC 2 H 3 O 2 dissolves spontaneously in H 2

Question

1. which of the following is true, NaC2H3O2 dissolves spontaneously in H2O. temperture drops when the solid dissolves. For this reaction enthalpy and entropy will have the following signs.

a.DeltaH < 0 and delta S <0

b. deltaH>0 and delta S <0

c.deltaH<0 and delta S >0

d.delta H>0 and delta S>0

2.For a specfic combustion the reaction Delta H rxn < 0 and delta Srxn >0. under standerd conditions this reaction is.

a. Non-spontaneous at all tempertures

b.Spontaneous at high temperatures

c.Spontaneous at low temperatures

d. Spontaneous at all tempertures

3. what is true about spontaneous process ?

a. Entropy of universe always increase.

b.entropy of system alwasy decreases.

c.entropy of the system always increases

d. entropy change of the system always equal and opposite to the entropy change of the surroundings.

4. Strongest reducing agent ?

a. Na+  

b. Na

c.Mg

d.Mg+

Explanation / Answer

1. c. delta H < 0 and delta S >0

2. d. Spontaneous at all tempertures

3. a. Entropy of universe always increase

4. Strongest reducing agent: Na

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