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Q75 (CAPF/2015) Science & Technology › Basic Science (Physics, Chemistry, Biology) › Applied everyday chemistry Answer Verified

Match List-I with List-II and select the correct answer using the codc given below the Lists : List 1 (Compound) A. Urea B. Hydrous copper C. Lead sulphide D. Potassium List-II (Colour) 1. Blue 2. White sulphate 3. Pinkish purple 4. Black permanganate Code: A B C D

Result
Your answer: —  Â·  Correct: A
Explanation

The matching of compounds to their characteristic colours is as follows: Urea is a white crystalline solid, commonly used as a nitrogenous fertilizer. Hydrous copper (specifically copper(II) sulphate pentahydrate) is well-known for its bright blue colour due to water of crystallisation [2]. When dehydrated, it turns white [1]. Lead sulphide (PbS), also known as the mineral galena, is naturally black. Potassium permanganate (KMnO4) is a deep purple or pinkish-purple solid that produces an intense purple solution when dissolved in water [4]. Therefore, the correct sequence is A-2 (Urea-White), B-1 (Hydrous copper-Blue), C-4 (Lead sulphide-Black), and D-3 (Potassium permanganate-Pinkish purple). This corresponds to the code 2 1 4 3.

Sources

  1. [1] Science , class X (NCERT 2025 ed.) > Chapter 2: Acids, Bases and Salts > Activity 2.15 > p. 32
  2. [2] https://pubchem.ncbi.nlm.nih.gov/compound/Copper-sulfate-pentahydrate
  3. [4] http://ia800203.us.archive.org/25/items/textbookofinorga028790mbp/textbookofinorga028790mbp.pdf
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