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A substance ‘X’ is used in white-washing and is obtained by heating limestone in the absence of air. Identify ‘X’.
- a)CaOCl2
- b)Ca (OH)2
- c)CaO
- d)CaCO3
Correct answer is option 'C'. Can you explain this answer?
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A substance ‘X’ is used in white-washing and is obtained b...
Calcium Oxide (CaO)
Calcium oxide, commonly known as quicklime, is the substance 'X' used in white-washing. It is obtained by heating limestone (calcium carbonate - CaCO3) in the absence of air through a process called calcination.
Process of Obtaining Calcium Oxide (CaO)
- Limestone (CaCO3) is heated in a kiln or furnace to a temperature above 900°C.
- During this process, carbon dioxide (CO2) is driven off, leaving behind calcium oxide (CaO).
Properties of Calcium Oxide (CaO)
- Calcium oxide is a white, caustic, alkaline solid at room temperature.
- It is widely used in various applications such as in the production of cement, as a soil amendment, in the manufacturing of paper and pulp, and in the chemical industry.
Application in White-Washing
- Calcium oxide is used in white-washing due to its ability to react with water to form calcium hydroxide (Ca(OH)2), a process known as slaking.
- When calcium hydroxide reacts with carbon dioxide from the air, it forms calcium carbonate, which gives a white color and helps in whitening the surfaces.
In conclusion, calcium oxide (CaO) is obtained by heating limestone in the absence of air and is commonly used in white-washing due to its chemical properties and reactions.
Calcium oxide, commonly known as quicklime, is the substance 'X' used in white-washing. It is obtained by heating limestone (calcium carbonate - CaCO3) in the absence of air through a process called calcination.
Process of Obtaining Calcium Oxide (CaO)
- Limestone (CaCO3) is heated in a kiln or furnace to a temperature above 900°C.
- During this process, carbon dioxide (CO2) is driven off, leaving behind calcium oxide (CaO).
Properties of Calcium Oxide (CaO)
- Calcium oxide is a white, caustic, alkaline solid at room temperature.
- It is widely used in various applications such as in the production of cement, as a soil amendment, in the manufacturing of paper and pulp, and in the chemical industry.
Application in White-Washing
- Calcium oxide is used in white-washing due to its ability to react with water to form calcium hydroxide (Ca(OH)2), a process known as slaking.
- When calcium hydroxide reacts with carbon dioxide from the air, it forms calcium carbonate, which gives a white color and helps in whitening the surfaces.
In conclusion, calcium oxide (CaO) is obtained by heating limestone in the absence of air and is commonly used in white-washing due to its chemical properties and reactions.
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A substance ‘X’ is used in white-washing and is obtained by heating limestone in the absence of air. Identify ‘X’.a)CaOCl2b)Ca (OH)2c)CaOd)CaCO3Correct answer is option 'C'. Can you explain this answer?
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A substance ‘X’ is used in white-washing and is obtained by heating limestone in the absence of air. Identify ‘X’.a)CaOCl2b)Ca (OH)2c)CaOd)CaCO3Correct answer is option 'C'. Can you explain this answer? for Class 10 2025 is part of Class 10 preparation. The Question and answers have been prepared according to the Class 10 exam syllabus. Information about A substance ‘X’ is used in white-washing and is obtained by heating limestone in the absence of air. Identify ‘X’.a)CaOCl2b)Ca (OH)2c)CaOd)CaCO3Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for Class 10 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A substance ‘X’ is used in white-washing and is obtained by heating limestone in the absence of air. Identify ‘X’.a)CaOCl2b)Ca (OH)2c)CaOd)CaCO3Correct answer is option 'C'. Can you explain this answer?.
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