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( begin array l xK_ 2 Cr_ 2 O_ 3 +yH_ 2 SO_ 4 +zH_ 2 O_ 2 rightarrow a~ k _ 2 SO_ 4 +b Cr_ 2 left(SO_ 4 right)_ 3 20 ~mL 0.5 M quad 50 ml+CH_ 2 O+dO_ 2 end array ) উদ্দীপকে ( H_ 2 | Suva Ai