43
What volume of carbon (ll) oxide is produced by reacting excess carbon with 10 dm3 of oxygen?
- A. 5 dm 3
- B. 20 dm 3
- C. 15 dm 3
- D. 10 dm 3
44
The presence of an impurity in substance will cause the melting point to
- A. be zero
- B. reduce
- C. increase
- D. be stable