Consider the following reactions of three unknown metals X, Y and Z.

${\rm{2XN}}{{\rm{O}}_3}{\rm{(aq)}} + {\rm{Y(s)}} \to 2{\rm{X(s)}} + {\rm{Y(N}}{{\rm{O}}_3}{)_2}{\rm{(aq)}}$

${\rm{Y(N}}{{\rm{O}}_3}{)_2}{\rm{(aq)}} + {\rm{Z(s)}} \to$ No reaction

$2{\rm{XN}}{{\rm{O}}_3}{\rm{(aq)}} + {\rm{Z(s)}} \to 2{\rm{X(s)}} + {\rm{Z(N}}{{\rm{O}}_3}{)_2}{\rm{(aq)}}$

What is the order of increasing reactivity of the metals (least reactive first)?

A.     ${\text{X}} < {\text{Y}} < {\text{Z}}$

B.     ${\text{X}} < {\text{Z}} < {\text{Y}}$

C.     ${\text{Z}} < {\text{Y}} < {\text{X}}$

D.     ${\text{Y}} < {\text{Z}} < {\text{X}}$

B