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

  • question_answer 4) The diagram shows a beaker containing a solution of zinc sulphate and two carbon electrodes. A battery is placed next to it. In order that the electrode P be plated with zinc,

    A)  P must be connected to S and Q to R

    B)  P must be connected to Q and S to R

    C)  P must be connected to R and Q to S

    D)  P and Q must be connected to R.

    Correct Answer: C

    Solution :

    Zinc sulphate is the salt that forms hydrogen at the cathode. As electrode P be plated with zinc, the electrode P is the anode and P must be connected to R, a positive terminal of the battery and Q is the cathode and must be connected to S.

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