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  9. Q70

HPSC HCS 2021 · Question 70 of 177

This compound is conventionally used for the whitewashing of buildings. Which of the following statements is/are true about it. 1. It is obtained by treating quick lime with water. 2. It is produced when calcium carbide reacts with water. 3. It is one of the raw materials used for the manufacture of Portland cement. 4. It is called slaked lime and its chemical formula is Ca (OH)2. Select the correct answer using the code given below:

Chemistry

  1. A1 and 4 only
  2. B2,3 and 4 only
  3. C1,2 and 4 onlyCorrect
  4. D1,2 and 3 only

Answer: C. 1,2 and 4 only

Explanation

Slaked lime Ca(OH)2 is made from quicklime and water (and also forms when calcium carbide reacts with water); it is used in whitewashing, though Portland cement uses limestone.

Source: HPSC HCS (Ex.Br.) Prelims Paper-I (General Studies) held 12-Sep-2021 (exampyq/doorsteptutor compilation); answers per official HPSC answer key

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