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Four substances were tested for their el...

Four substances were tested for their electrical conductivity by placing in contact with anode and cathode in a cell. The results are shown in the table. Study the table and answer the following questions.

Which solutions could be alumina and magnesium nitrate respectively?

A

P and Q

B

R and Q

C

P and S

D

P is the alumina but none of P, Q, R, S is magnesium nitrate.

Text Solution

Verified by Experts

The correct Answer is:
D
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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