| An unknown metal X when placed in copper sulphate solution, red brown pieces of copper fall to the bottom of the test tube. |
| When metal X is placed in aluminium sulphate solution, no change is observed. Metal X can be |
A) Sodium
B) Potassium
C) Iron
D) Calcium.
Correct Answer: C
Solution :
Iron is more reactive than copper hence, it displaces copper from copper sulphate solution but iron is less reactive than aluminium hence, no reaction takes place with aluminium sulphate.
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