Question

2h₂o → 2h₂ + o₂
synthesis
decomposition
single displacement
double displacement
combustion

Explanation:

A decomposition reaction is one where a single compound breaks down into two or more simpler substances. In the given reaction \(2H_2O
ightarrow2H_2 + O_2\), water (\(H_2O\)) is breaking down into hydrogen (\(H_2\)) and oxygen (\(O_2\)).

• Synthesis reaction: Involves combining two or more substances to form a single product. For example, \(2H_2+O_2

ightarrow 2H_2O\).

• Single displacement reaction: One element replaces another in a compound. For example, \(Zn + CuSO_4

ightarrow ZnSO_4+Cu\).

• Double displacement reaction: Ions in two compounds exchange places. For example, \(AgNO_3 + NaCl

ightarrow AgCl+NaNO_3\).

• Combustion reaction: A substance reacts with oxygen, usually producing heat and light. For example, \(CH_4 + 2O_2

ightarrow CO_2+2H_2O\).

Answer:

B. Decomposition