问题
选择题
亚硝酸(HNO2)既可作氧化剂又可作还原剂，当它在反应中作氧化剂时，可能生成的是
A．N2O5
B．N2O3
C．NH3
D．NO2
答案
答案：C
亚硝酸(HNO2) 在反应中作氧化剂时，化合价降低，HNO2中氮元素的化合价是+3价，只要比+3价低就可以，NH3 氮元素的化合价为-3价，可能生成的是NH3，故选C
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亚硝酸(HNO2)既可作氧化剂又可作还原剂，当它在反应中作氧化剂时，可能生成的是
A．N2O5
B．N2O3
C．NH3
D．NO2
答案：C
亚硝酸(HNO2) 在反应中作氧化剂时，化合价降低，HNO2中氮元素的化合价是+3价，只要比+3价低就可以，NH3 氮元素的化合价为-3价，可能生成的是NH3，故选C
| 阅读理解。读一读，选择正确答案。 |
| L: Hi, Steven! How are you? S: I'm fine. Thanks. And you? L: I'm fine, too. Today is my birthday. Please come to my birthday party tonight. S: Happy birthday to you, Li Ming! What's the date today? L: Today is August twelfth. S: How old are you? L: I'm eleven years old. S: What is your address? L: My address is 268 Ninth Avenue. S: Look! This is for you. L: Birthday present! A black and white football! I like it very much. Thank you. |
| 1. When is Li Ming's birthday? |
[ ] |
| A. On August ninth. B. On August twelfth. |
| 2. How old is Li Ming? |
[ ] |
| A. Nine years old. B. Eleven years old. |
| 3. What is Li Ming's address? |
[ ] |
| A. 268 Ninth Avenue. B. 286 Ninth Avenue |
| 4. What is Li Ming's birthday present? |
[ ] |
| A. Football. B. Basketball. |
| 5. What colour is the football? |
[ ] |
| A. Black. B. Black and white. |
