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HCS (Haryana)Prelims2023General Studies
Question
Which of the following statements about the types of soaps is/are TRUE? 1. Transparent soaps are made by dissolving the soap in ethanol and then evaporating the excess solvent. 2. Shaving soaps contains fillers like sodium rosinate, sodium silicate, borax and sodium carbonate. 3. Soap chips are made by running a thin sheet of melted soap onto a cool cylinder and scraping off the soaps in small broken pieces. Choose the correct answer from the Options given below:
Options
- A 1 and 2 only
- B 2 only
- C 1 and 3 only
- D 2 and 3 only
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Correct Answer
C 1 and 3 only
Model Answer
- Soaps that are transparent in nature are generally made by dissolving soaps in ethanol, & then evaporating the excess solvent which results in crystallization of the soap. Therefore, Transparent soaps are made by dissolving the soap in ethanol and then evaporating the excess solvent. Hence, Statement 1 is correct.
- Shaving soaps contain glycerol to prevent rapid drying.
- Laundry soaps contain fillers like sodium rosinate, sodium silicate, borax, and sodium carbonate to increase their lather-forming ability. Hence, Statement 2 is not correct.
- Fillers are added to soaps to affect their properties and make them useful for a particular application. For example, silicates give firmness to soap and enable it to hold more water.
- Soap chips are made by running a thin sheet of melted soap into a cool cylinder and scraping off the soaps in small broken pieces. Hence, Statement 3 is correct.