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( begin array l (i) A যৌগ frac [O] K_ 2 Cr_ 2 O_ 7 +H_ 2 SO_ 4 ~B যৌগ frac [O] K_ 2 Cr_ 2 O_ 7 +H_ 2 SO_ 4 C যৌগ end array ) ( (ii) C ) যৌগ ( xrightarrow[ Delta] NaOH+CaO CH_ 4 +Na | Suva Ai