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Distinguish between the following pairs of compounds using the reagent given in the bracket:
i] Manganese dioxide & copper [II] oxide [using concentrated HCI] Activate Windd ii] Ferrous sulphate solution & ferric sulphate solution. [using sodium hydroxide soln.]

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Manganese dioxide reacts with concentrated hydrochloric acid to give chlorine gas, which is greenish yellow in colour, whereas copper (II) oxide reacts with concentrated hydrochlo ric acid to give `CuCl_(2)`, but no chlorine gas is evolved.
`MnO_(2)+4HCl to MnCl_(2)+Cl_(2)uarr+2H_(2)O`
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