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Diagram 3 shows four chemical cells.
What is the arrangement of metal \(\mathrm{Q}\), copper, iron and magnesium in descending order of the electrochemical series?
Table below shows the observation for the reactions between metal \(\mathrm{X}\) with two different salt solutions.
Salt solution |
Observation |
Copper(II) sulphate |
Brown deposit is formed |
Zinc sulphate |
No change |
Which of the following is the correct descending order of metal \(\mathrm{X}\), copper and zinc in the electrochemical series?