Prabin Kalikote

We all know, carbon dioxide gas is heavier than air which causeit to flow to the lower surface. Therefore,carbon dioxide gas isfound in lower surface like deep wells, mines, caves,etc.

Carbon dioxide gas is collected in the gas jar by the downward ofair because it is heavier than air which cause itto flow to the surface.

Whencarbon dioxide is passed in lime water for a long time, themilky colordisappearsslowly due to the formation of watersoluble calcium bicarbonate [Ca(HCO₃)₂].
CaCO₃ + H₂O + CO₂ --------> Ca(HCO₃)₂

When we pass CO₂ in lime water, it becomesmilkywhite due to the formation of insoluble calcium carbonate (CaCO₃).

For commercial purpose, carbon dioxidegas ismanufactured by heating calcium carbonate. During thisprocess, calcium oxide i.e. lime or quick lime is alsoproduced.
CaCO₃ -------------> CaO + CO₂

Any 3 chemical properties of carbon dioxide gas are:
-CO₂ reacts with water and gives carbonic acid.
CO₂ + H₂O ----------> H₂CO₃
-Green plants concert solar energy into chemicalenergy by photosynthesis. In this process CO₂ andwater react to give starch and oxygen.
6CO₂ + 6H₂O ----------> C₆H₁₂O₆ + 6O₂
- CO₂ reacts with lime water and gives insolublecalciumcarbonate (CaCO₃), which makes the solution milky white.
CO₂ + Ca(OH)₂ ----------> CaCO₃ + H₂O

Any 4 physical properties of CO₂ gasare:
-It is colorless, odorless and tasteless gas.
-It is heavier than air.
-It is acidic in nature.
-It is neithercombustible nor a supporter ofcombustion.
-It is soluble in wader and produce carbonic acid when dissolved in water.