Given that the order of reactivity of four metals is P>Q>R>S, which of the following reactions is feasible?
When a metal gives out an electron,it becomes positively charged. The most reactive metal is P, but from the equations given in the options, P should become P+ once it gives out an electron but no option as such. Then we opt for the next most reactive which is Q. If Q gives out an electron, it becomes Q+ while S is the less reactive. Option B is feasible.
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