Question

Which clue can be used to identify a chemical reaction as a replacement reaction?

The reaction has two reactants with ions that seem to switch places.
The reaction has a single reactant that changes into two or more products.
The reaction involves oxygen reacting with a hydrocarbon and giving off heat.
The reaction involves a single product forming from two or more reactants.

Answer 1

"The reaction has two reactants with ions that seem to switch places" can be used to identify a chemical reaction as a replacement reaction.

Answer 2

Answer: Option (a) is the correct answer.

Step-by-step explanation:

When only one element gets displaced upon chemical reaction between a compound and an element then it is known as a single replacement reaction.

For example,
`Fe_(2)O_(3)(s) + 2Al(s) \rightarrow Al_(2)O_(3)(s) + 2Fe(l)`

On the other hand, when two compounds chemically react together and their ions get replaced by each other then it is known as a double replacement reaction.

For example,
`AgNO_(3)(aq) + NaCl(aq) \rightarrow AgCl(s) + NaNO_(3)(aq)`

Thus, we can conclude that the reaction which has two reactants with ions that seem to switch places clue can be used to identify a chemical reaction as a replacement reaction.