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Give two examples each of:

Combination reactions.

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Combination reaction is a reaction in which two or more reactants combined together to form a single product.

For examples:

When nitrogen gas is treated with hydrogen gas in the presence of a catalyst at 773K to form ammonia gas. The following reaction takes place:

Formation of water from H2 and O2 :

2H2 + O2→ 2H2O

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