Achemical reaction has two elements as reactants. which type of reaction might occur?

synthesis
decomposition
single replacement
double replacement

The correct answer is Synthesis reaction.

Explanation:

From the given options:

Synthesis reactions are defined as the reactions in which two substances in their elemental state combines to form a single product.

Decomposition reactions are defined as the reactions in which a single substance breaks to form two or more substances.

Single replacement reactions are defined as the reactions in which more reactive metal replaces less reactive metal from its chemical equation. The reactivity is determined from the series called reactivity series. The metal lying above in the series is more reactive than the metal lying below in the series.

Double displacement reaction is defined as the reaction in which exchange of ions takes place.

From the above information, the correct answer is synthesis reaction.