Яка реакція йонного обміну є необоротною?
А) 2NaOH + Cu(NO3 )2 = Cu(OH)2 + 2NaNO3
Б) 2NaCl + K2SO4 = Na2SO4 + 2KCl
В) Ba(NO3 )2 + HCl = BaCl2 + HNO3​
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