问题 选择题

a mol FeS 与b mol Fe3O4投入到V L c mol · L-1 的硝酸溶液中恰好完全反应,假设只产生NO 气体。所得澄清溶液的成分是Fe(NO3)3和H2SO4的混合液,则反应中未被还原的硝酸物质的量(mol)为:①( a + 3b )     ②(3cV-9a-b) / 3    ③(9a + b )/ 3               ④(cV-3a-9b)         ⑤ (3a+9b)则正确的答案是 [ ]

A. ②⑤          

B. ②③          

C. ①⑤            

D. 前述答案均不对 

答案

答案:A

填空题

照样子,写词语。

赤裸裸:                                                                    

美不胜收:                                                                                                     

:                  地                              地                                  地 

故:                                                                                

勃勃生机(AABC式):                                                                                   

伶伶俐俐(AABB式):                                                                                   

用(含近义词):                                                                                               

(含反义词):                                                                                               

洁白玉(含比喻):                                                                                              

威(含动物名):                                                                                               

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