Какое уравнение соответствует реакции обмена?
а) Mg + O2→MgO,
б) 2Fe(OH)3 → Fe2O3 + 3H2O
в) 2NaI + Br2→2NaBr + I2
г) PbCl2 + Na2S → PbS + 2NaCl
СРОЧНО!!!!!!!!!!
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