Which reaction is a decomposition reaction? a. 2kclo3 → 2kcl + 3o2 b. 4na + o2 → 2na2o c. zns + 3o2 → 2zno + 2so2 d. 2nabr + caf2 → 2naf + cabr2

Explanation:

In a decompostion reaction one single substances decomposes into two or more substances.

The general form for a decompostion reaction is: AB → A + B

In the reaction 2KClO₃ → 2KCl + 3O₂, the reactant, which is the compound shown on the left side of the reaction, i.e. KClO₃ will disappear and two new substances, the products, shown on the right side of the equation, will appear.

So, it is said that KClO₃ decomposes into KCl and O₂.

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