| Direction: Four substances were tested for their electrical conductivity. The results are shown in the table. Study the table and answer the following questions. | |||
| Substance | Bulb | Substance at Cathode | Substance at Anode |
| P | Lights up | Aluminium | Oxygen |
| Q | Lights up | Nothing | Nothing |
| R | Does not light up | Nothing | Nothing |
| S | Lights up | Hydrogen | Carbon dioxide |
A) P and Q
B) R and Q
C) P and S
D) P is the alumina but no one is magnesium nitrate.
Correct Answer: D
Solution :
When electricity is passed through molten alumina during electrolysis, the alumina splits up into its elements aluminium and oxygen. In the electrolysis of magnesium nitrate, oxygen is formed at anode and hydrogen is formed at cathode.
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