Question

an element A reacts with water to form compound B which is used in white washing . the compound B on heating forms an oxide C which on treatment with water gives back B. identity A,B,C and give the reactions involved.

Answer 1

A- calcium oxide (CaO)

B- calcium hydroxide (Ca(OH)2)

C- calcium carbonate (CaCO3)

CaO + H2O ------ Ca(OH)2 + heat

This use in white washing

Answer 2

Identification of compounds A, B, and C

• The chemical compound which is used for white washing is calcium hydroxide.
• This substance is obtained when the element of calcium is made to react with water.
• The equation involved in the reaction is as follows:

$Ca+2H_2O\rightarrow Ca(OH)_2+H_2$.

• Thus from the above equation element A is identified as calcium whereas compound B is identified as calcium hydroxide.
• When compound B which is identified as calcium hydroxide is heated, it leads to the formation of two products namely calcium oxide and water.
• The equation involved in the reaction is as follows:

$\mathrm{Ca}(\mathrm{OH})_{2} \stackrel{\Delta}{\rightarrow} \mathrm{CaO}+\mathrm{H}_{2} \mathrm{O}$.

• From the above equation oxide C is identified as calcium oxide. When it is treated with water it again yields calcium hydroxide as per the following equation:

$CaO+H_2O\rightarrow Ca(OH)_2$

• The compounds A, B, and C are identified as follows:

1. Element A - Calcium (Ca)
2. Compound B - Calcium hydroxide $Ca(OH)_2$
3. Oxide C - Calcium oxide (CaO)

Learn more about such concept

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Compound A when dissolved in water give compound B which is used in whitewashing compound B react with CO2 to from a white precipitate of compound C identify the compound A,B and C also write the equation involved

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