黄金是Au对应的单质,化学性质很稳定。而假黄金是铜锌合金,颜色

黄金是Au对应的单质,化学性质很稳定。而假黄金是铜锌合金,颜色和外形似黄金。下列不能区分黄金与假黄金的方案是

A.在空气中灼烧              B.放在盐酸中

C.放在NaOH溶液中                     D.放在AgNO3溶液中

答案

C

相关题目

生活中的下列物质属于溶液的是( ) A.果汁 B.冰水 C.食
生活中的下列物质属于溶液的是( ) A.果汁 B.冰水 C.食盐水   D.豆浆
Five years ago, David Smith wore an expensive suit to work every day. “I was a
Five years ago, David Smith wore an expensive suit to work every day. “I was a clothes addict,” jokes. “I used to carry a fresh suit to work with me so I could change if my clothes got wrinkled.
天灾不可忘,人祸更须防。“东方之星”客船沉没长江、天
天灾不可忘,人祸更须防。“东方之星”客船沉没长江、天津滨海新区爆炸……教训惨重!必须树立起对生命的敬畏,这是每个人的责任,也是政府的
抛物线y=ax2(a>0)与直线y=kx+b(k≠0)有两个公共点,其横坐标分
抛物线y=ax2(a>0)与直线y=kx+b(k≠0)有两个公共点,其横坐标分别是x1、x2,而直线y=kx+b与x轴交点的横坐标是x3,则x1、x2、x3之间的关系是( ) A.x3=x1+x2      
名句填空。( 12分 ) (1) 李白在《渡荆门送别》中描绘夜间
名句填空。( 12分 ) (1) 李白在《渡荆门送别》中描绘夜间、黄昏时江面上美丽景色的诗句是                 ,                。 (2)
Only when I got here _________ that I had made a big mistake.  A. did I realize
Only when I got here _________ that I had made a big mistake.  A. did I realize      B. I realized     C. I have realized D. have I realized
Researches have shown that the first impression you make on an interviewer real
Researches have shown that the first impression you make on an interviewer really counts.Fortunately,there are some actions you can take to help master the first impression. Timing:Few things g
 小王同学阅读了下表后,得出了一些结论,其中正确的是( 
 小王同学阅读了下表后,得出了一些结论,其中正确的是(  ) A. 不同的物质,密度一定不同       B.固体的密度都比液体的大   C. 同种物质在

最新题目