In the given chemical reactions, the statement that is true is A synthesis reaction, and B is a decomposition reaction. The correct option is C.
Synthesis reactions are those reactions in which two reactants combine to form a single big product or compound. Like the first one reaction in which the magnesium and oxygen combine to create two moles of magnesium oxide. A + B = AB. When
Decomposition reactions are those reactions in which one reaction or compound breaks down to comprise two smaller products. Like the second reaction, calcium chloride breaks down into calcium oxide and carbon dioxide. AB = A + B.
Thus, the correct option is C. A is a synthesis reaction, and B is a decomposition reaction.
To learn more about decomposition reactions, refer to the link:
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