Chemistry > 2007 > 28
WASSCE
In four separate experiments, the same quantity of magnesium ribbon was added to an excess of hydrochloric acid. In which of the experiments will hydrogen be given off most rapidly?
| Experiment | Volume of acid (cm3 | Concentration of acid (mol dm-3 |
| W | 10 | 1.0 |
| X | 20 | 0.5 |
| Y | 30 | 2.0 |
| Z | 50 | 1.0 |
A.
W
B.
X
C.
Y
D.
Z
Answer: C
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