The three sub-atomic particles that made up an atom are electron, proton and neutron. The proton and neutron are present in the nucleus of an atom whereas electrons revolve around the nucleus in the orbits. The atoms are electrically neutral that is they have no charge due to the presence of equal number of protons (which is positively charged) and electrons (which is negatively charged).
All the atoms have negatively charged electrons which are counter balanced by the presence of equal number of protons in the nucleus of an atom and thus, the element is neutral in nature and possess no charge.
Answer:
(a) PbSO4 anode is reduced to Pb.
Explanation:
Cells which can be recharged are known as secondary cells. They can be recharged by passing a direct current through them. An example of a secondary cell is the lead storage battery used in motor cars.
During the process of recharging, the electrodes in the cell are reversed from what we have know to occur during discharging because it is electrolized.
At the anode: The lead (II) tetraoxosulphate (VI) absorbs two electrons to become reduced to Pb. Thus at the anode PbSO₄ is reduced to Pb.
At the cathode:
The electrons from the anode are accepted at the cathode where the lead (iV) oxide is oxidised into lead (II) ions.
POH = 14 - pH
pOH = -log [OH-]