题目

二氧化硒(SeO2)是一种氧化剂,其被还原后的单质硒可能成为环境污染物,通过与浓HNO3或浓H2SO4反应生成SeO2以回收Se。已知:① Se+2H2SO4(浓)=2SO2↑+SeO2+2H2O ② SO2+SeO2+ H2O Se + SO42-+ H+ （1） 依据Se与浓H2SO4的反应,写出Se和浓HNO3(还原产物为NO2)反应的化学方程式:。 （2） Se与浓HNO3的反应中,氧化剂是, 反应中被还原的元素是。当有标准状况下33.6LNO2气体生成时,转移电子的物质的量是mol。 （3） 依据反应①②,判断SeO2、浓H2SO4、SO2的氧化性由强到弱的 1.They had an English party last Sunday. (改为否定句)    They _____ ____ an English party last Sunday. 2.The reporter asked the girl, “Do you like your volunteer work on weekends?” (改为间接引语)    The reporter asked the girl _____ she _____ her volunteer work on weekends. 3.The girl with a flower in her hand is my sister. (改为含定语从句的复合句)    The girl ____ ____ a flower in her hand is my sister. 4.Should I arrive on time or a little later if someone invites me to dinner? (改为同义句)    Am I ____ ____ arrive on time or a little later if someone invites me to dinner? 5.The students will learn the group dance on the school playground. (对画线部分提问) ______ _____ the students learn the group dance?