a)Al_{2}(SO_{4})_{3} + 3H_{2}" alt="2Al+3H_{2}SO_{4}->Al_{2}(SO_{4})_{3} + 3H_{2}" align="absmiddle" class="latex-formula">
б)SO_{2}+Ag_{2}SO_{4}+2H_{2}O" alt="2Ag+2H_{2}SO_{4}_{(k)}->SO_{2}+Ag_{2}SO_{4}+2H_{2}O" align="absmiddle" class="latex-formula">