<span>вот </span>
<span>Mg + 2HCl = MgCl2 + H2 </span>
<span>Mg(0) + 2H+ + 2Cl- = Mg(2+) + 2Cl- + H2 </span>
<span>Mg(0) + 2H+ = Mg(2+) + H2 </span>
<span>AgNO3 + HCl = AgCl + HNO3 </span>
<span>Ag+ + NO3- + H+ + Cl- = AgCl + H+ + NO3- </span>
<span>Ag+ + Cl- = AgCl </span>
<span>Al(OH)3 + 3HCl = AlCl3 + 3H2O </span>
<span>Al(OH)3 + 3H+ + 3Cl- = Al(3+) + 3Cl- + 3H2O </span>
<span>Al(OH)3 + 3H+ = Al(3+) + 3H2O</span>
Oтвет:CH2=CH2(Б) и CH4(B)