(a) In elec
(a) In electrolysis of water (H2O), the hydrogen goes to one test tube and oxygen goes to another. The two electrodes collect H2 and O2 separately.
Since water (H2O) consists of 2 parts of hydrogen and 1 part of oxygen, so, the volume of hydrogen gas (H2) collected over cathode (negative electrode) is double the volume of oxygen gas (O2) collected over anode (positive electrode).
(b) (i) When potassium iodide solution is added to lead nitrate solution, then a yellow precipitate of lead iodide is produced along with potassium nitrate solution.
(ii) This a double displacement reaction.
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