本课配套习题挑战模式3/5
单选题
难度系数:
3.
曾用作麻醉剂的笑气,是一种氮的氧化物,其中氮元素的化合价为+1价,则笑气的化学式是______
A: N2O5 |
B: N2O3 |
C: NO |
D: N2O |
一次做对,真牛!
+5奖励规则>
- 提示1:PHA+T+eahOWMluWQiOS7t+aYry0y5Lu3PC9wPg==
- 提示2:PHA+5qC55o2u5YyW5ZCI5Lu35Luj5pWw5ZKM5Li6MOWIl+aWueeoizwvcD4=
- 答案:RA==
PHA+5LuO6aKY5Lit5Y+v55+l77yM56yR5rCU5ZCr5pyJTuOAgU/kuKTnp43lhYPntKDvvIzlhYPntKDmjpLliJfpobrluo/mmK/lt6ZO5Y+zT++8jOWNs05P44CC5L2GTuS4uisx5Lu377yMT+S4ui0y5Lu377yM6K6+5a6D5Lus55qE5Y6f5a2Q5Liq5pWw5q+U5Li6eO+8mjEuPGJyPjwvcD48cD7liJl4w5coKzEpKygtMik9MO+8jHg9Mu+8jOWboOatpOeskeawlOeahOWMluWtpuW8j+S4uu+8mk48c3ViPjI8L3N1Yj5P44CCPGJyPjwvcD4=
本课配套习题挑战模式4/5
单选题
难度系数:
4.
下列各组物质中,带下划线的同种元素的化合价相同的是
A: Cl2、NaCl |
B: NH4Cl、HNO3 |
C: MnO2、K2MnO4 |
D: P2O5、Ca3(PO4)2 |
一次做对,真牛!
+5奖励规则>
- 提示1:PHA+5Y2V6LSo55qE5YyW5ZCI5Lu35pivMDwvcD4=
- 提示2:PHA+5YWD57Sg55qE5YyW5ZCI5Lu35Luj5pWw5ZKM5Li6MDwvcD4=
- 答案:RA==
PHA+QemhuUNsPHN1Yj4yPC9zdWI+5LitQ2znmoTljJblkIjku7fkuLow77yMTmFDbOS4rUNs55qE5YyW5ZCI5Lu35Li6LTHjgII8L3A+PHA+QumhuU5IPHN1Yj40PC9zdWI+Q2zkuK1O55qE5YyW5ZCI5Lu35Li6LTPku7fvvIxITk88c3ViPjM8L3N1Yj7kuK1O55qE5YyW5ZCI5Lu35Li6KzXku7fjgII8L3A+PHA+Q+mhueS4rU1uTzxzdWI+Mjwvc3ViPuS4rU1u55qE5YyW5ZCI5Lu35Li6KzTku7fvvIxLPHN1Yj4yPC9zdWI+TW5PPHN1Yj40PC9zdWI+5LitTW7nmoTljJblkIjku7fkuLorNuS7t+OAgjwvcD48cD5E6aG55Lit55qEUOWdh+S4uis15Lu344CCPC9wPg==