11 mark
Hydrochloric acid is often used to clean metals by reacting with the surface coating which develops on some metals when exposed to the atmosphere.
Which row correctly describes the surface coating on these metals?
| name | acidic or basic | reacts with |
A | oxide | basic | acid |
B | oxide | acidic | basic |
C | alloy | acidic | basic |
D | alloy | basic | acid |
Choose your answer