Ques. No. 2
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Single displacement reactions are those in which an uncombined single element simply replaces the other in a compound. A general chemical equation for reaction is
AB + X -------> AX + B
For example
So, the given reactions are of the form single displacement reactions, and it can be easily seen that 'Y' is getting easily displaced from YA and YB compounds. therefore, it is least reactive. Further, as X replaces Y moreover it is being itself displaced by Z from XA compound. Hence, it can be inferred that Z is most reactive element.
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