CARBONDIOXIDE
1. What are the main sources of carbondioxide?
- Rhe main sources of carbondioxide are plants and animals, limestone (CaCO3), magnetite (MgCO3) etc.
2. How is CO2 prepared in lab?
- In the laboratory CO2 is prepared by the reaction of calciun carbonate with dilute hydrochloric acid.
CaCO3 + 2HCl----CaCl2 +H2O + CO2
3. How is CO2 gas collected?
- Since CO2 is heavier than air because it is heavier than air.
4. How is CO2 gas tested?
- CO2 gas can be tested by following ways:
i. By inserting a burning match stick inside the gas jar. If it extinguished, CO2 will be present.
ii. When a burning magnesiun ribbon keeps burning even after inserting it inside the gas jar, it means CO2 is present.
iii. Blue litmus paper turns into red.
5. How is CO2 prepared in large quantity in industries?
- CO2 and lime are obtained when limestone is heated at very high temperature.
CaCO3 -------- CaO+ CO2
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