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A synthesis reaction is a reaction between at least two compounds in which

Aone breaks down into at least two products.
Ba compound is decomposed by an electric current.
Ca compound burns in the presence of oxygen.
Da new compound is formed.

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D; a new compound is formed (like A + B --> AB)

Answer: d. a new compound is formed.

Explanation:

1. Decomposition is a type of chemical reaction in which one reactant gives two or more than two products.

Example: \(Li_2CO_3\rightarrow Li_2O+CO_2\)

2. Electrolytic decomposition is a type of chemical reaction in which one reactant gives two or more than two products. on passing electric current.

Example: \(H_2O\rightarrow H_2+\frac{1}{2}O_2\)

3. Combustion is a type of chemical reaction in which fuel is reacted with oxygen to form carbon dioxide and water.

Example:  

\(C_6H_{12}O_6+O_2 \rightarrow CO_2+H_2O\)

4. Synthesis reaction is a chemical reaction in which two reactants are combining to form one product.

Example: \(Li_2O+CO_2\rightarrow Li_2CO_3\)  

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