question_answer

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

In substance Q, bulb lights up but no substance is found either at cathode or at anode, why?

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.