P, Q and R are three metals that undergo chemical reactions as follows:
$P_{2} O_{3} + 2 Q \to Q_{2} O_{3} + 2 P$

$2 P + 3 R O \to P_{2} O_{3} + 3 R$

$3 R S O_{4} + 2 Q \to Q_{2} {(S O_{4})}_{3} + 3 R$

Observe the reactions and arrange the metals in the increasing order of their reactivity.

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Q>P> R

P>Q>R

Q> R>P

R> P> Q

answer is B.

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Detailed Solution

More reactive metal displace less reactive metal from the reactions we observed that reactivates are

Q > P ​ ​ ​; P > R; Q > R

; so, the increasing order of reactivity

R < P < Q

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