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. Osmosis
• D.  Because Q is a poor conductor of electricity.