题目

One of the world’s most dangerous sports is mountain climbing, and one of the most popular places for this is the Himalayas. The Himalayas run along the southwestern part of China. And at 8,844.43 meters high, Mount Qomolangma is the tallest mountain of the Himalayas as well as on the Earth. While it is famous for its beautiful views, parts of the mountain are facing a problem: rubbish. Every year, visitors and climbers throw away tons of rubbish, such as bottles and plastic bags.According to the UN, over 140 tons of rubbish has been left on the mountain. To reduce rubbish, China is limiting用铂电极电解100mL HNO3 与 AgNO3的混合液，通电一段时间后，两极均收集到 2．24 L气体（标准状况），则原混合液中Ag+的物质的量浓度为 A．1mol·L－1        B．2 mol·L－1       C．2．5 mol·L－1     D．3 mol·L－1