200.0mL 2.0mol•L-1的某溶液中溶质的物质的量为0.2L×2.0mol•L-1=0.4mol,Al的物质的量为=0.2mol, A、因Al与HNO3溶液不生成氢气,则不符合题意,故A错误; B、由2Al+2OH-+2H2O═2AlO2-+3H2↑,0.2molAl与0.4molBa(OH)2溶液反应时,碱过量,故B错误; C、由2Al+6H+═2Al3++3H2↑,0.2molAl与0.4molH2SO4溶液,硫酸过量,故C错误; D、由2Al+6H+═2Al3++3H2↑,0.2molAl与0.4molHCl溶液,Al过量,故D正确; 故选D. |