PYQ Vault

Day 96: CBSE Class 10 Science

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

  1. Question 1

    Carbon and its Compounds. Asked once: 2024 (same type asked 3 times)

    7
    Consider the following statements about homologous series of carbon compounds : (a) All succeeding members differ by −CH2-\mathrm{CH_2} unit. (b) Melting point and boiling point increases with increasing molecular mass. (c) The difference in molecular masses between two successive members is 16 u. (d) C2H2\mathrm{C_2H_2} and C3H4\mathrm{C_3H_4} are NOT the successive members of alkyne series. The correct statements are –

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  2. Question 2

    Carbon and its Compounds. Asked once: 2023 (same type asked 3 times)

    7
    The electron dot structure of chlorine molecule is :

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  3. Question 3

    Chemical Reactions and Equations. Asked once: 2024 (same type asked 3 times)

    33
    (i) Define a decomposition reaction. Write chemical equation for the reaction that occurs when lead nitrate is heated strongly in a boiling tube. (ii) In electrolytic decomposition of water two gases are liberated at the electrodes. Give the mass ratio of the gas liberated at the cathode and at the anode.

  4. Question 4

    Chemical Reactions and Equations. Asked once: 2025 (same type asked 3 times)

    21
    While burning a magnesium ribbon in air, list two safety measures which should be followed. Also state two observations of this activity.

  5. Question 5

    Chemical Reactions and Equations. Asked once: 2025 (same type asked 3 times)

    1
    In which one of the following situations a chemical reaction does not occur?

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