问答题  
【正确答案】3As+5HNO3+2H2O→3H3AsO4+5NO
   6Sb+10HNO3→3Sb2O5+10NO+SH2O
   Bi+HNO3+3H+→Bi3++NO+2H2O
【答案解析】
【正确答案】As the elements get more metallic(down the periodic table) ,they tend to form positive ions more and oxyanions less.
【答案解析】