Limestone Properties and Reactions

The video explores limestone, a sedimentary rock rich in fossils, and its chemical composition, calcium carbonate (CaCO3). It discusses limestone's thermal decomposition, producing calcium oxide for cement, and its reactions with acids, forming calcium chloride, carbon dioxide, and water. Safety in experiments is highlighted, and limestone's uses in construction, agriculture, and neutralizing acid rain are explained.

What type of rock is limestone?

• Volcanic

• Metamorphic

• Sedimentary

• Igneous

What is the chemical formula for limestone?

• CaO

• Ca(OH)2

• CaCO3

• CO2

Which gas is produced during the thermal decomposition of calcium carbonate?

• Oxygen

• Nitrogen

• Carbon Dioxide

• Hydrogen

Why is it important to remove the tube from lime water after the experiment?

• To avoid the formation of a vacuum

• To stop the reaction

• To cool down the experiment

• To prevent water from entering the tube

What is formed when calcium carbonate reacts with hydrochloric acid?

• Calcium Nitrate

• Calcium Sulfate

• Calcium Chloride

• Calcium Hydroxide

What is the role of calcium in the reaction with hydrochloric acid?

• It neutralizes the acid

• It acts as a catalyst

• It forms a salt

• It releases hydrogen gas

Which of the following is a common use of limestone in agriculture?

• Insect repellent

• Soil pH adjustment

• Pesticide

• Fertilizer

How does limestone help in neutralizing acid rain in lakes?

• By increasing the water temperature

• By absorbing the acid

• By raising the pH level

• By reducing the water level

What is a key industrial use of calcium oxide derived from limestone?

• Textile dyeing

• Plastic manufacturing

• Cement production

• Glass making

In which countries is limestone used to combat acid rain effects?

• India and China

• Australia and New Zealand

• USA and Canada

• Sweden and Norway