UPSC Prelims 2003·GS1·science-and-technology·materials and robotics

Consider the following statements The purpose of adding sodium sulphate and sodium silicate to the detergent in a washing powder is 1. To keep the washing powder dry 2. To maintain the alkalinity of the powder Which of these statements is/are correct?

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Last updated 8 Jul 2026, 4:39 pm IST
  1. AOnly 1
  2. BOnly 2
  3. CBoth 1 and 2Correct
  4. DNeither 1 nor 2

Explanation

Both statements are correct.

  1. To keep the washing powder dry: Sodium sulphate acts as a filler and an anti-caking agent. It absorbs moisture, preventing the powder from clumping and ensuring it remains dry and free-flowing. Sodium silicate also contributes to the physical stability and flowability of the powder.

  2. To maintain the alkalinity of the powder: Sodium silicate is a builder in detergents. It helps to maintain the alkalinity (pH) of the washing solution, which is essential for effective cleaning, especially for removing greasy and oily stains and for optimal performance of other detergent components. It also helps to soften hard water.

Since both purposes are served by the addition of these compounds, statement C is correct.

science-and-technology: Consider the following statements The purpose of adding sodium sulphate and sodium silicate to the detergent in a washin
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