Examples of decomposition reaction — task. Chemistry CBSE Live product, Class 10.

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Which of the following is a decomposition reaction?

\(2HgO\) → \(2Hg\) + \(O_2\)
\(CaCO_3\) → \(CaO\) + \(CO_2\)
\(2H_2O\) → \(2H_2\) + \(O_2\)
\(N_2\) + \(3H_2\) → \(2NH_3\)

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