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

Let us understand all the reactions

a) Substance XYZ breaks down into X and YZ: this is simple decomposition reaction

b) Substance G reacts with compound XY to form GY and X.

here G is replacing X in XY so this is single replacement reaction

c) Substance X burns rapidly in the presence of oxygen.

This is combustion reaction

d) Substance QR and GT exchange ions with each other

this is double displacement reaction

Substance G reacts with compound XY to form GY and X.

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