A student performed various experiments to investigate about the reactivities of four unknown elements, $P, Q, R, X a n d Y$ . Metals $P a n d R$ can react with dilute acids to produce hydrogen gas while $X$ cannot. Identify the correct order of reactivity.

Q > Y > P > R > H y d r o g e n > X

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Q > X > R > P > Y

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X > P > Q > Y > R > H y d r o g e n

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P > Y > R > Q > H y d r o g e n > X

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Solution

The correct option is A $Q > Y > P > R > H y d r o g e n > X$
Q and Y are present on top of the reactivity series as they are not displaced by any other metal, while P and R react with mineral acid acids to form hydrogen gas so they are present in the middle of series and P is more reactive than R as it displaces R from its solution and the least reactive is X which is present below the hydrogen gas. Thus, option A is correct.

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