Question

What is the decreasing order of reactivity of the metal?

Answer 1

here is ans ..
In order of decreasing reactivity, the metals potassium, sodium, lithium, calcium, magnesium, zinc, iron and copper can be put in order of the irreactivity from their reactions with water and dilute acids.

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Answer 2

from bottom to upper reactive that is
k >ba. > ca. > na.> mg. > al. > zn. >fe. >sn. pb. > h>. cu. > hg. > ag. > au. > pt