Question

$Ca{{(OH)}_{2}}$is formed when calcium oxide dissolves in water.
(A)- True
(B)- False

Answer 1

Hint: A reaction in which two or more elements or compounds combine to form a single compound or product is called a Combination reaction.
     \[X+Y\to XY\]

Complete Step by step answer:

-Slake lime, another name of Calcium hydroxide is an inorganic compound that has a white, powdery appearance when present in its solid-state, however in the crystalline form it is colorless.

-Calcium hydroxide is also known by many other names like hydrated lime, slack lime, pickling lime, or caustic soda.

- When calcium oxide is mixed with water, a small proportion of it dissolves forming a solution known as limewater. Hence we can say that the saturated solution of calcium hydroxide is known as lime water.

-Commercial production of calcium hydroxide involves the reaction of quicklime with water. $CaO+{{H}_{2}}O\to Ca{{(OH)}_{2}}$

-Calcium oxide, which is also known as quicklime, unslaked lime, pebble lime, calcia, or burnt lime is a white, caustic, alkaline, crystalline chemical compound with the chemical formula CaO.

-The term “lime” used denotes the calcium-containing inorganic materials which may be carbonates, oxides, hydroxide of calcium, silicon, magnesium, aluminum, or iron.


So, the statement in the question is True, hence the correct option is A.


Notes: Calcium hydroxide is used in the process of sewage treatment as a clarifying agent or as a flocculant. It is also used in the paper industry in the process of converting wood into wood pulp by the process known as the Kraft process. Calcium hydroxide is an essential compound in the preparation of ammonia. Calcium hydroxide is used in the production of many plastics, pesticides, hair care products, and the leather industry. Due to the basicity of calcium hydroxide, it is also used as a pH modifier.