Indicate the types of chemical reactions represented by the following equations:
$2 H_{2} O (l) \overset{electric current}{\to} 2 H_{2} (g) + O_{2} (g)$

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Solution

1. Type of reaction
Combination reaction: Reaction in which two or more reactants combine to form a single product. $A + B \to C$
Decomposition reaction: Reaction in which reactant is broken down into two or more products in the presence of heat, light or electricity. $A \to B + C$
Displacement reaction: Reaction in which one of the higher reactive element displaces a less reactive element from its solution. $A + BC \to AC + B$
( Here A is more reactive than B)
Double displacement reaction: Reaction in which ions of both the reactants interchange their place and form new compounds. $AB + CD \to AD + CB$
2. Reaction
$2 H_{2} O (l) \overset{electric current}{\to} 2 H_{2} (g) + O_{2} (g)$
Water Hydrogen Oxygen
Here in the presence of electricity water dissociate into hydrogen and oxygen.
Since one reactant is breaking down into two products so it is a decomposition reaction.
Also, we can say it is endothermic in nature because electrical energy is utilized to dissociate water.
Since in presence of electric current decomposition is taking place we will call this as electrolysis of water.

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