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:<br /><br />1) $HgO + 2HNO_{3} \rightarrow Hg(NO_{3})_{2} + H_{2}O$<br /> - This matches with: B. $Hg(NO_{3})_{2} + H_{2}O$<br /><br />2) $2Al + 3H_{2}SO_{4} \rightarrow Al}(SO_{4})_{3} + 3H_{2}$<br /> - This matches with: A. $Al_{2}(SO_{4})_{3} + H_{2}$<br /><br />3) $K_{2}O + 2H_{3}PO_{4} \rightarrow 2K_{3}PO_{4} + 3H_{2}O$<br /> - This matches with: B. $K_{3}PO_{4} + H_{2}O$<br /><br />So the correct matches are:<br />1) $HgO + HNO_{3}$ - B. $Hg(NO_{3})_{2} + H_{2}O$<br />2) $Al + H_{}$ - A. $Al_{2}(SO_{4})_{3} + H_{2}$<br />3) $K_{2}O + H_{3}PO_{4}$ - B. $K_{3}PO_{4} + H_{2}O$