Energetics-Equilibrium-Redox

Q: Which one of the following is not a characteristic of catalyst?

(a) :  It lowers the activation energy of molecules.
(b) :  It increases the rate of reaction.
(c) :  It changes the equlibrium constant.
(d) :  It alters the reaction path.
(e) :  None of the Above
Answer:  It changes the equlibrium constant.
Explanation:  

Q: What happens when zinc is placed in aqueous copper (II) sulpahte?

(a) :  Copper atoms are oxidized
(b) :  Zinc atoms are oxidized
(c) :  Copper ions are oxidized
(d) :  Zinc ions are oxidized
(e) :  None of the Above
Answer:  Zinc atoms are oxidized
Explanation:  

Q: If one measure the gradient of the emf of the cell with respect to temperature, the emf result will be the value for:

(a) :  ΔH for the cell reaction
(b) :  ΔS of cell reaction
(c) :  ΔG of the cell reaction
(d) :  None of these
(e) :  None of the Above
Answer:  ΔS of cell reaction
Explanation:  

Q: The heat capacity of a substance at constant volume is direcly related to the :

(a) :  The enthalpy,H
(b) :  Internal energy,E
(c) :  Entropy,S
(d) :  Free energy,G
(e) :  None of the Above
Answer:  Internal energy,E
Explanation:  

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