Answer:
Correct choice are C and D (they are both, the same).
Explanation:
Cathode is the positive(+) electrode where a reduction occurs.
Reduction is the chemical reaction where the oxidation state is reduced.
2Ag(s) + 1/2 O2(g) + 2H+(aq) → 2Ag+(aq) + H2O (l)
A. 2H2O (l) → O2 (g) + 4H+ (aq) + 4e-
B. 2Ag (s) → 2Ag+ (aq) + 2e-
C. 1/2 O2 (g) + 2H+ (aq) + 2e- → H2O (l)
D. 1/2 O2 (g) + 2H+ (aq) + 2e- → H2O (l)
C or D, are ok. They are the same equation.
Oxygen from ground state reduce the oxidation state from 0 to -2
1 kpa = 7.5 mm of Hg [Remember it or can be found on internet ]
So, 275 kpa = 7.5 x 275 = 2062.5 mm of Hg
False. Pb is lower than Al in the reactivity series. It cannot replace aluminium in AlCl3
Have a wonderful day :) thanks for the points
The term identifies the characteristic tingling sensations and reddening of the skin after ingesting a pharmacologic dose of nicotinic acid will be<u> naicin flush.</u>
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It could also treat niacin deficiency along with high triglyceride and cholesterol levels. Additionally, it can lessen the chance of a heart attack but also slow artery narrowing.
Niacin, sometimes referred to as nicotinic acid, would be a naturally occurring vitamin 
found in the diet. It can raise blood lipid (fat) levels, including triglycerides and cholesterol, when used as medicine. In order to exert its effects, nicotinic acid causes the liver to produce less "bad" cholesterol and triglycerides.
Therefore, The term identifies the characteristic tingling sensations and reddening of the skin after ingesting a pharmacologic dose of nicotinic acid will be<u> naicin flush.</u>
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To know more about nicotinic acid
brainly.com/question/13255467
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