Displacement reactions involving metal oxides
3 marks · EasyA student mixes three different metals (M, N, P) with the oxides of each other and heats them. The table shows their observations:
| Added metal | Metal oxide | Reaction observed? (Yes/No) |
|---|---|---|
| M | N oxide | Yes |
| M | P oxide | No |
| N | M oxide | No |
| N | P oxide | No |
| P | M oxide | Yes |
| P | N oxide | Yes |
Which metal is the most reactive?
Arrange the metals in order of decreasing reactivity.
Explain your reasoning for this order using the table.
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
(a) N
(b) N, M, P
(c) N is most reactive because it does not react with any oxides but is displaced from its oxide by other metals. P is least reactive, as both M and N displace it from its oxide.
Common mistakes: Reversing order; Not using evidence from table
Show mark scheme and worked solution
Marking points
B1 (a) · 1 mark · Correctly identifies most reactive metal (N)
B2 (b) · 1 mark · Orders metals: N, M, P or equivalent (most to least reactive)
B3 (c) · 1 mark · Explains order with reference to which metals were displaced or not displaced
Worked solution
(a) N is the most reactive. (b) Order: N, M, P (N most, P least reactive). (c) Reasoning: N never reacts with other oxides, meaning it is not displaced. P is least reactive as both N and M can displace it from its oxide.