Question

which is most reactive metal in the following
Ni, Al, Ca, Pb

Answer 1

The most reactive metal is Ca (Calcium).

Answer 2

Out of these metals, Ca is the most reactive as it is higher up in the reactivity series than the other metals.

Reactivity of elements decreases on going down the reactivity series.

Reactivity of some metals are given in descending order K > Na > Ca > Mg > Al > Zn > Fe > Pb > Cu.