Metal ‘X’ displaces metal ‘Y’ from its salt solution but is not able to displace metal ‘Z’ from its salt solution. Identify the most reactive metal.

The correct option is Z.

Step-by-step Explanation:

1. According to the reactivity series of metals, a more reactive metal has the ability to displace a less reactive metal from its salt solution.

2. The problem states that metal ‘X’ displaces metal ‘Y’ from its salt solution. This means that metal ‘X’ is more reactive than metal ‘Y’ (Reactivity: X > Y).

3. It is also given that metal ‘X’ is not able to displace metal ‘Z’ from its salt solution. This implies that metal ‘Z’ is more reactive than metal ‘X’ (Reactivity: Z > X).

4. Combining these two observations, the order of reactivity of the metals from highest to lowest is:

$\text{Z}>\text{X}>\text{Y}$

Therefore, Z is the most reactive metal.