2. Расставьте коэффициенты в схемах реакций:
А) Al + S  Al2S3;
Б) K + H2O  KOH + H2;
В) СaCl2 + AgNO3  AgCl + Ca(NO3)2;
Г) Al2(SO4)3 + KOH  Al(OH)3 + K2SO4.
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