PYQ Vault

Day 27: CBSE Class 10 Science

5 questions. Try each one first, then open its answer.

  1. Question 1

    Chemical Reactions and Equations. Asked 2 times: 2024*, 2025 (* = numbers or wording changed that year)

    1
    Electrolysis of water is a decomposition reaction. The mass ratio (MH:MO)(\mathrm{M_H} : \mathrm{M_O}) of hydrogen and oxygen gases liberated at the electrodes during electrolysis of water is :

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  2. Question 2

    Chemical Reactions and Equations. Asked 2 times: 2024*, 2025 (* = numbers or wording changed that year)

    26
    Write chemical equation for the chemical reaction between the aqueous solutions of sodium sulphate and barium chloride. State two types of chemical reactions in which this reaction can be placed.

  3. Question 3

    Chemical Reactions and Equations. Asked 2 times: 2024*, 2025 (* = numbers or wording changed that year)

    27
    How is a double displacement reaction different from a displacement reaction ? Explain giving example in the form of balanced chemical equations.

  4. Question 4

    Chemical Reactions and Equations. Asked 2 times: 2024*, 2025 (* = numbers or wording changed that year)

    5
    The colour of the solution observed after about 1 hour of placing iron nails in copper sulphate solution is

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  5. Question 5

    Control and Coordination. Asked 2 times: 2024*, 2025 (* = numbers or wording changed that year)

    8
    The plant hormone present in greater concentration in the areas of rapidly dividing cells is :

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