First slide

Electrolysis

Question

4F of electricity can decompose --------------- moles of acidulated water

Moderate

A

0.5
B

1
C

2
D

4

Solution

Cathode : $[2 H_{2} O + 2 e^{-} \to H_{2} + 2 {OH}^{-}] \times 2$
Anode : $2 H_{2} O \to 4 H^{^{+}} + O_{2} + 4 e^{-}$
Net Reaction: $2 H_{2} O \overset{4 F}{\to} \underset{Cathode}{2 H_{2}} + \underset{Anode}{O_{2}}$ ;
2 moles of water can be decomposed by 4F

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