Только амфотерные гидроксиды расположены в ряду: 1) Al(OH)3, KOH, Cr(OH)3; 2)Al(OH)3, Fe(OH)3, Cr(OH)3; 3)Ca(OH)2, Fe(OH)2, Cr(OH)3 ; 4)Mg(OH)2, HOH, NaOH.
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