8th Class Science Chemical Effects of Electric Current Question Bank Chemical Effects of Electric Current

  • 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.

    Correct Answer: B

    Solution :

    Q must be silver, copper, mercury and other metals.

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