Combination reaction — task. Chemistry CBSE Live product, Class 10.

Choose the correct answer from the options given below:

Which of the following reactions involves the combination of two elements?

\(SO_2\) + \(1/2O_2\) → \(SO_3\)
\(4Na\) + \(O_2\) → \(2Na_2O\)
\(CaI\) + \(CO_2\) → \(CaCO_3\)
\(NH_3\) + \(HF\) → \(NH_4F\)

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