C is correct.
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Answer:
H + ions are attracted to the cathode , gain electrons and form hydrogen gas. OH - ions are attracted to the anode , lose electrons and form oxygen gas.
Answer: The corresponding value of
for this reaction at 84.5°C is 0.00232
Explanation:

Relation of with is given by the formula:

where,
= equilibrium constant in terms of partial pressure = ?
= equilibrium constant in terms of concentration = 0.0680
R = Gas constant = 
T = temperature =
= change in number of moles of gas particles = 
Putting values in above equation, we get:

Thus the corresponding value of
for this reaction at 84.5°C is 0.00232