B-4. Veranonure coornercrnuc Mexay nponyistamn peakunh. 1) HgO+HNO_(3) A. Al_(2)(SO_(4))_(3)+H_(2) 2) Al+H_(2)SO_(4) B. K_(3)PO_(4)+H_(2)O 3) K_(2)O+H_(3)PO_(4) B Hg(NO_(3))_(2)+H_(2)O Na_(2)CO_(3)+H_(2)O

Let's correct the matching based on the given chemical reactions and products:1) - This matches with: B. 2) - This matches with: A. 3) - This matches with: B. So the correct matches are:1) - B. 2) - A. 3) - B.