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प्रश्न
Describe the importance of the limestone.
उत्तर १
Chemically, limestone is CaCO3.
Importance of limestone
- It is used in the preparation of lime and cement.
- It is used as a flux during the smelting of iron ores.
उत्तर २
Limestone:
- Extensively used in the manufacturing of high quality paper.
- Used as mild abrasive in toothpaste.
- As a filler in cosmetics.
- Used as an antacid.
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संबंधित प्रश्न
Describe two important uses of the following quicklime.
Describe the importance of the cement.
Describe the importance of the plaster of paris.
Dead burnt plaster is ______.
Which of the following statements is true about Ca(OH)2?
Several sodium compounds find use in industries. Which of the following compounds are used for textile industry?
(i) Na2CO3
(ii) NaHCO3
(iii) NaOH
(iv) NaCl
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.
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The conversion of hydroxyapatite occurs due to presence of p - ions in water. The correct formula of hydroxyapatite is ______.
\[\ce{Y <-[\Delta, 205°C] CaSO4.2H2O ->[\Delta, 120°C] X}\]
X and Y are respectively:
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The substance not likely to contain CaCO3 is ______.
