Question

what happens when potassium reacts with -
(a) water (b) dilute sulphuric acid
(c) oxygen
class 8 CBSE board ncert text book

Answer 1

Explanation:

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Answer 2

Explanation:

Potassium Hydroxide Reaction

Potassium hydroxide (KOH), commonly called caustic potash, is an important compound of Potassium which is used to make detergents and soaps. Potassium hydroxide dissolves readily in water, and gives off considerable heat and forms a strongly alkaline, caustic solution.

Potassium and Water Reaction

When small pieces of Potassium are added to water this results in a hissing sound and the substance burns with a lilac flame. Hydrogen gas is given out in the reaction and potassium hydroxide is formed.

Potassium + Water —> Potassium hydroxide + Hydrogen

Potassium Nitrate Reaction

Potassium nitrate (KNO3), also known as saltpeter, is an important compound of Potassium which is used in the production of fertilizers, matches, gunpowder and pyrotechnics. Potassium nitrate is slightly soluble in cold water and very soluble in hot water. It is prepared by the reaction of potassium chloride with sodium nitrate. When it is heated potassium nitrate decomposes and releases oxygen.

Potassium Chloride Reaction

Potassium chloride (KCl) is an important Potassium compound which is used in the production of fertilizers and chemicals and also as a salt substitute. Potassium chloride is soluble in water, alcohol, and alkalies and insoluble in alcohol. Potassium reacts with dilute hydrochloric acid to give potassium chloride and hydrogen gas.

Potassium + Dilute hydrochloric acid —> Potassium chloride + Hydrogen

Reaction with Oxygen

Heating small pieces of Potassium in air results in the substance melting without any flame being seen and turning instantly into a mixture of potassium peroxide and potassium super oxide. Larger pieces of potassium burn with a lilac flame.

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