Question

On the basis of the sequence of the given reactions identify the most and least reactive elements:

X+ YA → XA + Y ...(i) 

X + YB → XB + Y ...(ii) 

Z + XA → ZA + X 

A. X and Z B. Y and Z C. Z and X D. Z and Y

Answer 1

From the sets of reactions i, ii, iii, it can be observed from i and ii that X is more reactive than Y and hence it displaces Y from its salt. 

From reaction iii it can be observed that Z is more reactive than X as it displaces X from its salt. 

So the most reactive element is Z and the least reactive is Y. 

So correct answer is d [Z and Y].