PYQ Vault

Day 50: CBSE Class 10 Science

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

  1. Question 1

    Chemical Reactions and Equations. This type asked 3 times: 2023, 2025, 2026. This one: 2026

    18
    C6H12O6(aq)+6O2(g)⟶6CO2(g)+6H2O(l)\mathrm{C_6H_{12}O_{6(aq)} + 6O_{2(g)} \longrightarrow 6CO_{2(g)} + 6H_2O_{(l)}}. The above reaction is an example of -

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  2. Question 2

    Chemical Reactions and Equations. This type asked 3 times: 2024, 2025, 2026. This one: 2026

    19
    When ferrous sulphate crystals are heated in a test tube, we observe that :

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  3. Question 3

    Chemical Reactions and Equations. This type asked 3 times: 2024, 2025, 2026. This one: 2026

    19
    Which of the following are decomposition reactions ? (i) 2KClO3⟶2KCl+3O2\mathrm{2KClO_3 \longrightarrow 2KCl + 3O_2} (ii) MgO+H2O⟶Mg(OH)2\mathrm{MgO + H_2O \longrightarrow Mg(OH)_2} (iii) 2H2O⟶H2+O2\mathrm{2H_2O \longrightarrow H_2 + O_2} (iv) Zn+CuSO4⟶ZnSO4+Cu\mathrm{Zn + CuSO_4 \longrightarrow ZnSO_4 + Cu}

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  4. Question 4

    Chemical Reactions and Equations. This type asked 3 times: 2024, 2025, 2026. This one: 2026

    17
    Which of the following is an example of a displacement reaction ?

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  5. Question 5

    Chemical Reactions and Equations. This type asked 3 times: 2024, 2025, 2026. This one: 2026

    27
    Translate the following statements into chemical equation and then balance them : (a) Water is added to quicklime (b) Burning of natural gas (c) Thermal decomposition of ferrous sulphate