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Q11 (CISF/2024) Science & Technology › Basic Science (Physics, Chemistry, Biology)

The chemical formula of washing soda is

Result
Your answer: —  ·  Correct: C

Explanation

Washing soda is the common name for sodium carbonate decahydrate. Its chemical formula is Na2CO3·10H2O. It is a crystalline salt used extensively in domestic cleaning and for removing permanent hardness of water.

  • Option A: NaHCO3 is Sodium Bicarbonate, commonly known as Baking Soda.
  • Option B: Na2CO3 is anhydrous Sodium Carbonate, often called Soda Ash.
  • Option C: Correctly identifies the decahydrate form (containing 10 molecules of water of crystallization) which constitutes Washing Soda.
  • Option D: NaOC1 (likely a typo for NaOCl) refers to Sodium Hypochlorite, which is the primary component of bleach.
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SIMILAR QUESTIONS

NDA-I · 2018 · Q17 Relevance score: 7.49

Which one of the following is the chemical formula of Washing Soda ?

NDA-I · 2025 · Q81 Relevance score: 6.33

Match List I with List II and select the answer using the code given below the Lists : List I (Chemical Name) A. Washing soda B. Baking soda C. Bleaching powder D. Gypsum List II (Chemical Formula) 1. CaOCl2 2. NaHCO3 3. Na2CO3-10H2O 4. CaSO4-2H2O Code :

NDA-I · 2015 · Q34 Relevance score: 3.09

Washing Soda is the common name for