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.

Concept:

Metal activity series:

• The metals are arranged in an activity order that is known as the metal activity series.
• The more active metals are present at the top of the series whereas the less active metals are put at the end of the series.
• The metal activity series is as follows- 

Explanation:

• Metals on top of the activity series can displace metals at the bottom and they are highly reactive as compared to metals at the bottom of the series.

1. Metal 'X' displaces metal 'Y' from its salt solution, so 'X' is more reactive than 'Y'.
2. Metal 'X' Can not displace metal 'Z' from its salt solution, so 'Z' is more reactive than 'X'.

So reactivity order of these metals will be:

Z > X >Y.

So, metal 'Z' will be the most reactive metal among all.