PYQ Vault

Day 124: CBSE Class 10 Science

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

  1. Question 1

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

    1
    Example of thermal decomposition reaction are (i) 2 AgCl→2 Ag+Cl2\mathrm{2\,AgCl \rightarrow 2\,Ag + Cl_2} (ii) CaCO3→CaO+CO2\mathrm{CaCO_3 \rightarrow CaO + CO_2} (iii) 2 H2O→2 H2+O2\mathrm{2\,H_2O \rightarrow 2\,H_2 + O_2} (iv) 2 KClO3→2 KCl+3 O2\mathrm{2\,KClO_3 \rightarrow 2\,KCl + 3\,O_2}

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  2. Question 2

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

    27
    Study the experimental set-up shown in the diagram and write chemical equation for the chemical reaction involved. Name and define the type of reaction. List two other metals which can be used in place of iron to show the same type of reaction with copper sulphate solution.

  3. Question 3

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

    21 (b)
    Translate the following statements into chemical equations and then balance them : (i) Hydrogen sulphide gas burns in air to give water and sulphur dioxide. (ii) Silver bromide on exposure to sunlight decomposes into silver and bromine.

  4. Question 4

    Control and Coordination. Asked once: 2025 (same type asked 3 times)

    11
    The plant hormones promoting rapid cell division in seeds and wilting of leaves respectively are

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  5. Question 5

    Control and Coordination. Asked once: 2024 (same type asked 3 times)

    9
    Select out of the following a gland which does NOT occur as a pair in the human body :

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