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Question
Which of the following reactions will take place?
A. Mg + ZnSO4 → MgSO4 + Zn
B. Zn + CuCl2 → ZnCl2 + Cu
C. Cu + FeSO4 → CuSO4 + Fe
D. Fe + MgCl2 → FeCl2 + Mg
(a) C and D
(b) A and B
(c) A, B and C
(d) all the above
A. Mg + ZnSO4 → MgSO4 + Zn
B. Zn + CuCl2 → ZnCl2 + Cu
C. Cu + FeSO4 → CuSO4 + Fe
D. Fe + MgCl2 → FeCl2 + Mg
(a) C and D
(b) A and B
(c) A, B and C
(d) all the above
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Solution
(b) A and B
Magnesium, which is more reactive than zinc, displaces zinc from its solution (reaction A). Similarly, zinc, which is more reactive than copper, displaces copper from its copper chloride solution (reaction B). But, reactions C and D cannot occur. Copper, which is less reactive than iron, cannot displace iron from its salt solution. Again, iron, which is less reactive than magnesium, cannot displace magnesium from its salt solution.
Magnesium, which is more reactive than zinc, displaces zinc from its solution (reaction A). Similarly, zinc, which is more reactive than copper, displaces copper from its copper chloride solution (reaction B). But, reactions C and D cannot occur. Copper, which is less reactive than iron, cannot displace iron from its salt solution. Again, iron, which is less reactive than magnesium, cannot displace magnesium from its salt solution.
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