Question

Assertion - after white washing the wall a shimy white finish on walls is obtained after two to three days reason -calcium ocide react with carbon dioxide to form calcium hydrozen carbonate which gives shiny white finish​

Answer 1

$\LARGE{ \underline{ \green{ \sf{Correct \: Question:}}}}$

Assertion - After white washing the wall a shiny white finish on walls is obtained after two to three days.

Reason - Calcium oxide react with carbon dioxide to form calcium hydrogen carbonate which gives shiny white finish.

$\LARGE{ \underline{ \green{ \sf{Required \: answer:}}}}$

The substance used in white washing is the solution of lime water i.e. Calcium hydroxide made from Calcium oxide. When it is applied on the walls and left exposed to the atmosphere, it shines after few days due to reaction of lime water and Carbon dioxide.

$\large{ \cdot{ \rm{Ca(OH)_2 + CO_2 \longrightarrow CaCO_3 + H_2O}}}$

The product is Calcium carbonate which gives a shiny touch to the surface of walls.

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According to our observation, Assertion is true✓ because shiny appearance can be seen after 2-3 days due to the above reaction but the reason is false because the product is Calcium carbonate not Calcium Hydrogen carbonate.

Hence, the Assertion is true and Reason is false.

Answer 2

Explanation:

Answer : -

• Calcium hydroxide reacts slowly with the carbon dioxide in air to form a thin layer of calcium carbonate on the walls.

• Calcium carbonate is formed after two to three days of white washing and gives a shiny finish to the walls.

More to know : -

• Calcium carbonate is also know as CaCO3 Calcium carbonate is a dietary supplement used when the amount of calcium taken in the diet is not enough.

• Calcium is needed by the body for healthy bones, muscles, nervous system, and heart.

• Calcium carbonate also is used as an antacid to relieve heartburn, acid indigestion, and upset stomach.