1.1. Electricity was passed through molten lead(II) bromide using the apparatus shown.

The formation of a brown gas was observed at the positive electrode.

Give one other expected observation.

1.2. i) Name a non-metal that could be used for the electrodes.

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ii) Suggest why iron is not used for the electrodes.

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1.3. i) Name the brown gas formed

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ii) Suggest the result of testing this gas with damp blue litmus paper.

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1.4. Name the product formed at the negative electrode.

1.5. State one safety precaution that should be used when doing this experiment.