Final answer:
Option B (2AgNO3 + Cu = 2Ag + Cu(NO3)2) is a single replacement reaction, where copper displaces silver from silver nitrate to form copper nitrate and metallic silver.
Step-by-step explanation:
Among the options provided, the equation representing a single replacement reaction is B. 2AgNO3 + Cu = 2Ag + Cu(NO3)2. In this reaction, copper (Cu) displaces silver (Ag) from the compound silver nitrate (AgNO3), resulting in the formation of copper(II) nitrate (Cu(NO3)2) and the free element silver (Ag).
A single replacement reaction is characterized by one element replacing another element in a compound. A common example shown in textbooks and literature is magnesium (Mg) reacting with copper(II) nitrate (Cu(NO3)2) to produce magnesium nitrate (Mg(NO3)2) and metallic copper (Cu), which is another instance of a metal replacement. so, the correct option is B. 2AgNO3 + Cu = 2Ag + Cu(NO3)2.