Arrange the following according to the instructions: $K, Pb, Ca, Zn$ (In the increasing order of the reactivity).

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Solution

Reactivity series of metals is the arrangement of different metals according to their decreasing reactivity order.
$K$ (Potassium) is placed at the top of the reactivity series. It is highly reactive.
$Ca$ (calcium) is placed below the potassium in reactivity series.
$Zn$ (zinc) is placed after calcium. It is less reactive than $K$ and $Ca$
$Pb$ (lead ) is placed at a position lower than $K, Ca, Zn$ . It is less reactive than $K$ , $Ca$ , and $Zn$
The increasing order of the reactivity is $Pb < Zn < Ca < K$ .

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Arrange the following according to the instructions: K,Pb,Ca,Zn (In the increasing order of the reactivity).

Arrange the following according to the instructions: $K, Pb, Ca, Zn$ (In the increasing order of the reactivity).