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( begin array l 3 Fe_ (s) +4 H_ 2 O_ (k) rightleftharpoons Fe_ 3 O_ 4(~s) +4 H_ 2(~g) বিক্রিয়ায়- end array ) i. ( k_ c = frac left[H_ 2 right]^ 4 left[H_ 2 O right]^ 4 ) ii. ( k_ c | Suva Ai