PYQ Vault

Day 136: CBSE Class 10 Science

5 questions (8 parts). Try each one first, then open its answer.

  1. Question 1

    Acids, Bases and Salts. Asked once: 2023 (same type asked 2 times)

    32
    (i) Why is acidified water considered to be a good conductor of electricity ? (ii) Write a chemical equation showing the ionic products formed on dissolving potassium hydroxide in water. (iii) Care must be taken while diluting concentrated nitric acid with water. Why ?

  2. Question 2 (case study, 4 parts)

    Acids, Bases and Salts. Asked once: 2025 (same type asked 2 times)

    Common salt is a very important chemical compound for our daily life. It’s chemical name is sodium chloride and it is used as a raw material in the manufacture of caustic soda, washing soda, baking soda etc. It is also used in the preservation of pickles, butter, meat etc.
    37 (i)
    Name the acid and the base from which common salt can be obtained.
    37 (ii)
    State the nature (acidic/basic/neutral) of sodium chloride. Give reason for the justification for your answer.
    37 (iii) (A)
    What happens when electric current is passed through an aqueous solution of sodium chloride (called brine)? Name the products obtained along with the corresponding places in the electrolytic cell where each of these products is obtained.
    37 (iii) (B)
    How is washing soda obtained from sodium chloride? Give chemical equation of the reactions involved in the process.

  3. Question 3

    Acids, Bases and Salts. Asked once: 2025 (same type asked 2 times)

    5
    When a mixture of baking soda and tartaric acid is heated (or mixed in water) a product ‘X’ is formed, which is responsible for making breads and cakes soft and spongy. The product ‘X’ is

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  4. Question 4

    Acids, Bases and Salts. Asked once: 2026 (same type asked 2 times)

    27 (b)
    Write the preparation of following compounds with balanced chemical equation : (i) Baking soda (ii) Bleaching powder (iii) Plaster of Paris

  5. Question 5

    Carbon and its Compounds. Asked once: 2026 (same type asked 2 times)

    20
    Which of the following compounds will undergo addition reaction ?

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