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i. ( Cu+H_ 2 SO_ 4 ) (গাঢ়) ( longrightarrow X+SO_ 2 +H_ 2 O ) ii. ( Zn+H_ 2 SO_ 4 ) (গাঢ়) ( longrightarrow Y+SO_ 2 +H_ 2 O ) | Suva Ai