Question

A solution of a substance ‘X’ is used for whitewashing.
a) Name the substance ‘X’ and write its formula.
b) Write the reaction of the substance ‘X’ with water.

Answer 1

AnswEr:

a) Substance "X" is calcium oxide.

Chemical formula : CaO

b) Reaction with water : Calcium oxide reacts with water to form Calcium hydroxide.

CaO + $\sf{H_{2} O\:\longrightarrow\:Ca(OH)_2\:+\:Heat}$

ExTra about Calcium Oxide:

• It is also called quick lime.

• It is white, alkaline, crystalline which is solid at room temperature.

• It is insoluble in methanol.

ExTra about Calcium hydroxide:

• It is also called slaked lime.

• It is used for many purposes including food making.

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Answer 2

Explained Answer

Here, there is a solution of a substance "X" is used for the white washing. As we know that, we are using quick lime for the white washing. So, here the chemical name of quick lime is Calcium Oxide which white in colour. It is basic in nature. It is found in solid state.

White Washing Process

Firstly, we have to know the process of white washing. During white washing of our house, mistri take some amount of water in his bucket and put a packet of quicklime in it and shake it. After few seconds, some amount of heat energy produced from the bucket. As we know that if energy needed in the bond breaking in the reactants is less than the energy released when new bonds are formed resulting in the products, the chemical reaction is of exothermic in nature which is known as exothermic reaction. Then calcium hydroxide produced with some amount of heat energy which is a strong base because calcium is more reactive in nature for more reactive metal.

Answers:

(a). The name of the substance 'X' is Calcium Oxide or Quick lime. The chemical formula of the substance is CaO(s).

(b). The chemical reaction of the substance 'X' with water:

Reaction: CaO(s) + H2O(l) → Ca(OH)2 (aq) + Heat

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