Question

potassium metal reacts with water to give potassium hydroxide and hydrogen gas represent which type of reaction​

Answer 1

Answer :

Equation with the given information :-

$\tt{K + H_2O \longrightarrow KOH + H_2}$

➸ In this reaction hydroxide of potassium is formed along with the release of hydrogen gas.

➸ This reaction would have been vigorous as potassium is highly reactive metal which reacts vigorously with atmospheric Oxygen and water.

➸ This is why potassium is stored under kerosene so that it does not get in contact with the atmosphere.

➸ This is why the type of reaction will be exothermic reaction.

➸ Exothermic reaction : Any chemical reaction that releases energy in the environment in the form of heat, light or sound is called exothermic reaction.

➸ In this reaction, the temperature will rise.

➸ Some examples of exothermic reactions include combustion reaction, neutralization reaction, respiration and rusting of iron.

➸ Also, the given reaction is a single displacement reaction.

➸ A single displacement reaction is a reaction in which one element takes place of the other element in a compound.

➸ This is based on the reactivity of the elements.

➸ In the reaction, potassium is more reactive than hydrogen, hence hydrogen has been replaced by potassium to form a compound with oxygen.

Answer 2

Answer:

DISPLACEMENT REACTION.

Explanation:

What is displacement reaction?

Chemical reactions in which a more reactive metal displaces a less reactive metal from its compounds is known as displacement reaction.

What is the chemical reaction of Potassium and Water?

the reaction between potassium and water can be written in following way:

2K(s) + 2H2O(l) -----> 2KOH(l) + H2(g)

Why it is a displacement reaction?

In the following reaction Potassium which is more reactive than Hydrogen (as it is above hydrogen in reactivity series) replaces hydrogen from its compound i.e. H2O. As there is exchange of just one element it is Displacement Reaction.

[NOTE- Heat is also evolved during this reaction, so this is a Exothermic Reaction as well.]

HOPE IT HELPS YOU.