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Write the chemical equations to represent the following reactions.
(a) The oxidation of `HCI (aq)` to `Cl_(2) (g)` by `PbO_(2)`.
(b) The disproportionation of `SnO` to `Sn` and `SnO_(2)`.

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(a)`PbO_(2)+4HCl to PbCl_(2) + 2H_(2)O +Cl_(2)` , (b)`2SnO to Sn+SnO_(2)`.

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