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NCERT Class 10 Science Carbon and its Compounds: In-text questions (page 74) Solutions

AI-written, checked on 23 Oct 2026

Solutions written by Shishya, checked — not the board's official answers

Step-by-step working for every question of In-text questions (page 74) in NCERT's Class 10 Science book, chapter “Carbon and its Compounds”, written by Shishya. Each question is in our own short words; open the NCERT chapter for the exact wording and figures.

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How these were checked: the solutions were drafted with AI and then read and corrected on 23 Oct 2026. Every numerical final answer is recomputed from the question's own numbers by a calculator check that runs before each release; proofs and explanations were read, not machine-checked. The NCERT textbook is the authority — if something here disagrees with it, follow the book.

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  1. In-text (page 74) Q1

    How would you distinguish experimentally between an alcohol and a carboxylic acid?

    1. Take two separate test tubes and label them A and B, placing a small amount of the unknown liquid in each.
    2. Add a few drops of sodium carbonate solution to test tube A and shake it gently.
    3. Observe test tube A; if brisk effervescence of carbon dioxide gas is observed, the liquid is a carboxylic acid.
    4. Add a few drops of sodium carbonate solution to test tube B and shake it gently.
    5. Observe test tube B; if no effervescence or gas evolution is seen, the liquid is an alcohol.
    6. The carboxylic acid reacts with sodium carbonate to release CO2, while the alcohol does not react under these conditions.

    Answer: Carboxylic acid gives brisk effervescence with sodium carbonate, while alcohol does not.

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  2. In-text (page 74) Q2

    What are oxidising agents?

    1. An oxidising agent is a substance that causes oxidation in another substance.
      why?

      Oxidation is gain of oxygen (or loss of hydrogen); reduction is loss of oxygen (or gain of hydrogen). In a redox reaction one substance is oxidised while another is reduced.

    2. It does this by either adding oxygen to the other substance or by removing hydrogen from it.
    3. In the process, the oxidising agent itself gets reduced.
      why?

      Oxidation is gain of oxygen (or loss of hydrogen); reduction is loss of oxygen (or gain of hydrogen). In a redox reaction one substance is oxidised while another is reduced.

    4. Common examples of oxidising agents include oxygen, halogens, and potassium permanganate.
      why?

      Oxidation is gain of oxygen (or loss of hydrogen); reduction is loss of oxygen (or gain of hydrogen). In a redox reaction one substance is oxidised while another is reduced.

    Answer: Oxidising agents are substances that add oxygen or remove hydrogen from other substances and get reduced in the process.

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← Carbon and its Compounds: notes, practice and all exercises

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