|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|
|R||Does not light up||Nothing||Nothing|
|S||Lights up||Hydrogen||Carbon dioxide|
A) Because Q is non-electrolyte.
B) Because Q is an element which remains unchanged when it conducts electricity.
C) Because Q is an electrolyte that conducts electricity when it is in the molten state.
D) Because Q is a poor conductor of electricity.
Correct Answer: B
Solution :Q must be silver, copper, mercury and other metals.
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