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1. Which of the following is/are a decomposition reaction(s)?
2. The reaction in which two compounds exchange their ions to form two new compounds is-
Answer variants:
A single displacement reaction
A double displacement reaction
\(4Na\) + \(O_2\) → \(2Na_2O\)
\(CaCO_3\) → \(CaO\) + \(CO_2\)
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