Question

hydrogen burns in oxygen to produce water while water on passing current decomposes to give hydrogen and oxygen . what type of reaction in each case ?
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Answer 1

Answer:

$\mathfrak{Hello Mate}$

In the first case it is a combination reaction =

A combination reaction is a reaction where two or more elements or compounds combine to form a single compound.

In the second case , it is a Decomposition reaction

=Chemical decomposition is the breakdown of a single entity into two or more fragments. Chemical decomposition is usually regarded and defined as the exact opposite of chemical synthesis.

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Answer 2

ANSWER:-

Both are chemical changes as they are irreversible and chemical decomposition gets changed.

The fomation of water is a combination reaction.

=) 2H2 + O2-------) 2H2O

The electrolysis of water to give hydrogen & oxygen is a decomposition reaction.

=) 2H2O---------) 2H2 + O2

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