Name: Chemistry 3
Created By: V. Gokal
Max Time: 5 mins

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1. Study the graph. The activation energy, in kJ.mol-1 for the reverse reaction is …

2. Consider the following equation of a reversible reaction.
Which set of factors below would favour the formation of orange dichromate ion? Temp / H+

3. The following reversible reaction is used in the production of hydrogen iodide gas:
H2(g) + I 2 (g) ↔ 2HI(g) ΔH<0
The graph X was obtained under certain conditions.
Graph Y was obtained for the same experiment using the same amount of H2(g).
What changes were done to obtain graph Y?

4. A saturated solution of copper sulphate is in equilibrium with its ions.A few drops of concentrated H2SO4 is then added while T remains constant. Equilibrium is re-established. How will the product [Cu2+][SO42-] now compare to what they were originally?

5. Which one of the following half-cells would have to be connected to a Pb/Pb2+ half-cell to obtain a voltmeter reading of 0,27V in the following standard electrochemical cell?