Final answer:
The equation 2NaCl → 2Na + Cl₂ represents a decomposition reaction, where sodium chloride decomposes into sodium and chlorine gas. It also qualifies as a redox reaction due to the change in oxidation states of sodium and chloride ions.
Step-by-step explanation:
The equation 2NaCl → 2Na + Cl₂ represents a decomposition reaction. In a decomposition reaction, a single compound breaks down into two or more simpler substances. The opposite of a decomposition reaction is a synthesis reaction where simpler substances combine to form a more complex compound.
The provided equation shows that sodium chloride (NaCl) decomposes into sodium (Na) and chlorine gas (Cl₂). This reaction is also an example of a redox reaction, where the oxidation state of the elements changes. Sodium goes from an oxidation state of +1 in the sodium chloride to 0 in elemental sodium, undergoing reduction. Conversely, chlorine goes from -1 in sodium chloride to 0 in diatomic chlorine, undergoing oxidation.
It is important to note that single replacement and double replacement reactions involve an exchange of ions between two compounds, which is not the case here. Consequently, the correct classification of the given reaction is a decomposition reaction, not a single replacement reaction.