43
A gas X diffuses twice as fast as gas Y. if the relative molecular mass of X is 32, calculate the relative molecular mass of Y.
- A. 128
- B. 8
- C. 16
- D. 64
44
What is the percentage of sulphur in sulphur (IV) oxide?
- A. 66%
- B. 25%
- C. 40%
- D. 50%
45
A mixture is different from a compound because
- A. the properties of a compound are those of its individual constituents while those of a mixture differ from its constituents
- B. a mixture is always homogeneous while a compound is not
- C. the constituent of a compound are chemically bound together while those of a mixture are not
- D. a mixture can be represented by a chemical formula while a compound cannot