Discussion
Metal 'X' displaces metal 'Y' from its salt solution but is not able to displace metal 'Z' from its salt solution. Identify the most reactive metal.
Answer: C
The most reactive metal is Z.
A more reactive metal displaces a less reactive metal from a solution of its salt. X displaces Y, so X is more reactive than Y. X cannot displace Z, so Z is more reactive than X.
The order of reactivity is therefore Z, then X, then Y. X is in the middle, Y is the least reactive, and the information given is enough to decide, so 'cannot be determined' is wrong.
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