Question

plsssssssssssssss answer fast

Answer 1

Answer:

potassium and calcium

Explanation:

because it's reactivity is more

so used in displacement reaction

Answer 2

Answer:

Potassium and Calcium

Explanation:

Since Both Potassium and Calcium are placed above aluminium in reactivity series ,

They are more reactive than aluminium and can easily displace aluminium from its aqueous solution.