Discussion
Which of the following statements is/are true regarding relative reactivity of metals ?
(A) Zinc is more reactive than Iron but less reactive than Aluminium.
(B) Sodium is more reactive than Potassium and Calcium.
(C) Aluminium is more reactive than Magnesium.
Answer: C
Only (A) is true.
The reactivity series runs \(\mathrm{K \gt Na \gt Ca \gt Mg \gt Al \gt Zn \gt Fe}\) and so on. Zinc lies between aluminium and iron, so (A) is correct.
Sodium is less reactive than potassium (though more reactive than calcium), so (B) is false, and aluminium is less reactive than magnesium, so (C) is false.
A simple test is displacement: a more reactive metal displaces a less reactive one from its salt solution, so zinc displaces iron from iron sulphate but cannot displace aluminium.
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