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प्रश्न
Describe the importance of the cement.
उत्तर
Chemically, cement is a mixture of calcium silicate and calcium aluminate.
Importance of cement-
- It is used in plastering and in the construction of bridges.
- It is used in concrete.
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संबंधित प्रश्न
Describe two important uses of the following quicklime.
Describe the importance of the limestone.
Describe the importance of the plaster of paris.
Dead burnt plaster is ______.
Suspension of slaked lime in water is known as ______.
Which of the following statements is true about Ca(OH)2?
Match the elements given in Column I with the properties mentioned in Column II.
| Column I | Column II |
| (i) Li | (a) Insoluble sulphate |
| (ii) Na | (b) Strongest monoacidic base |
| (iii) Ca | (c) Most negative EΘ value among alkali metals. |
| (iv) Ba | (d) Insoluble oxalate |
| (e) 6s2 outer electronic configuration |
When water is added to compound (A) of calcium, solution of compound (B) is formed. When carbon dioxide is passed into the solution, it turns milky due to the formation of compound (C). If excess of carbon dioxide is passed into the solution milkiness disappears due to the formation of compound (D). Identify the compounds A, B, C and D. Explain why the milkiness disappears in the last step.
A substance absorbs \[\ce{CO2}\] and violently reacts with water. That substance is ______.
Initial setting of cement is mainly due to ______.
What are the products formed in sequence when excess of CO2 is passed in slaked lime?
The conversion of hydroxyapatite occurs due to presence of p - ions in water. The correct formula of hydroxyapatite is ______.
The commercial name for calcium oxide is ______.
In curing cement plasters, water is sprinkled from time to time. This helps in ______.
Which of the following on thermal decomposition yields a basic as well as acidic oxide?
