Formation of water from hydrogen and oxygen is an example of _________ reaction.

combination

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decomposition

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displacement

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precipitation

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Solution

The correct option is A combination
Formation of water from hydrogen and oxygen is a combination reaction because hydrogen and oxygen are combining to form single product. The reaction occurs as follows:
$2 H_{2} (g) + O_{2} (g) \to 2 H_{2} O (l)$

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O_{2} (g) + H_{2} (g) \to H_{2} O (g)

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