1.

Why are decomposition reactions called the opposite of combination reactions? Write equations for these reactions.

Answer»

Solution :In a COMBINATION reaction, two or more substances combine to form a single product. Also, a large amount of heat is evolved.
The DECOMPOSITION reactions REQUIRE energy either in the form of heat, light or electricity for BREAKING down one substance into two or more substances.
`N_(2)+3H_(2)rarr2NH_(3)+"Heat"`, Combination reaction
`2NH_(3)+"Heat"rarrN_(2)+3H_(2)`, Decomposition reaction


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