Out of Aluminium, Copper, Calcium and Tin, the most reactive metal is _________?

To determine the most reactive metal among Aluminium, Copper, Calcium, and Tin, we can refer to the reactivity series of metals. The reactivity series is a list of metals arranged in order of decreasing reactivity.

1. Understanding the Reactivity Series: In general, metals like Calcium are more reactive than Aluminium, which in turn is more reactive than Tin, and Copper is the least reactive of the four.

2. Order of Reactivity: The reactivity series for these metals is as follows:

   • Calcium (most reactive)
   • Aluminium
   • Tin
   • Copper (least reactive)

Final Answer

The most reactive metal among Aluminium, Copper, Calcium, and Tin is Calcium.