Chapter 19, Problem 3STP

To determine

To Choose: The correct option.

Answer to Problem 3STP

The correct option is (D).

Explanation of Solution

Introduction:

If two reactions are combining to form one product, then this reaction is called synthesis reaction.

Example of synthesis reaction is

${\text{CaO+H}}_{\text{2}}\text{O}\left(\text{l}\right)\to \text{Ca}{\left(\text{OH}\right)}_{\text{2}}\left(\text{aq}\right)$

In the following reaction, ammonium nitrate is decomposed to form nitrogen oxide and water. So, the reaction is decomposition reaction.

${\text{NH}}_{\text{4}}{\text{NO}}_{\text{3}}\left(\text{s}\right)\to {\text{N}}_{\text{2}}\text{O}\left(\text{g}\right){\text{+2H}}_{\text{2}}\text{O}$

Both synthesis and decomposition reactions are possible to each other. Thus, the reaction opposite to synthesis reaction is decomposition reaction.

Hence, the correct answer is (D).

Conclusion:

Hence, the reaction is decomposition.