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.

The correct option is Only (A).

Explanation:

To determine which statements are true, we need to refer to the standard metal reactivity series. In decreasing order of reactivity (from most reactive to least reactive), the reactivity series of common metals is:

Potassium (K) > Sodium (Na) > Calcium (Ca) > Magnesium (Mg) > Aluminium (Al) > Zinc (Zn) > Iron (Fe) > Lead (Pb) > Hydrogen (H) > Copper (Cu) > Silver (Ag) > Gold (Au)

Now, let us analyze each statement based on this reactivity series:

Statement (A): "Zinc is more reactive than Iron but less reactive than Aluminium."

Looking at the series: Aluminium (Al) > Zinc (Zn) > Iron (Fe).

Therefore, Zinc is placed above Iron (so it is more reactive than Iron) and below Aluminium (so it is less reactive than Aluminium).

Thus, statement (A) is TRUE.

Statement (B): "Sodium is more reactive than Potassium and Calcium."

Looking at the series: Potassium (K) > Sodium (Na) > Calcium (Ca).

Sodium is less reactive than Potassium, not more reactive.

Thus, statement (B) is FALSE.

Statement (C): "Aluminium is more reactive than Magnesium."

Looking at the series: Magnesium (Mg) > Aluminium (Al).

Magnesium lies above Aluminium in the reactivity series, making Magnesium more reactive than Aluminium.

Thus, statement (C) is FALSE.

Conclusion:

Only statement (A) is correct. Therefore, the correct choice is Only (A).