Which is a feature of a single replacement reaction?
a. substance xyz breaks down into x and yz.
b. substance g reacts with compound xy to form gy and x.
c. substance x burns rapidly in the presence of oxygen.
d. substance qr and gt exchange ions with each other.

A single replacement reaction is where one atom of one of the reactants compounds leaves and other atom takes its place. This is represented by the equation AB + C ---> AC + B, as you see in this representation the atom B leaves the compound AB and it is replaced by the atom C, forming the compound AC, while B stays alone. That is the same represented by the option b. Substance G reacts with compound XY fo form GY and X. So, option b. is the right answer.

B.substance G react with compound XY to form GY and X