Chemical Reactions and Equations

CBSE Class 10 · Science · 31 past questions

11 of 31 · show all

1. Q4 2026

   2 g of green coloured crystals of ferrous sulphate are heated in a dry boiling tube. Name the type of…

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2. Q8 Sample paper 2026-27

   A food label is given below. E304 and E307b are added to the flavoured biscuits.… (with a figure)

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3. Q11 2025

   Consider the following chemical equation…

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4. Q12 2025

   Electrolysis of water is a decomposition reaction. The mass ratio ($M_H : M_O$) of hydrogen and oxygen gases…

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5. Q15 2025

   For Questions number 17 to 20, two statements are given — one labelled as Assertion (A) and the other…

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6. Q18 2024

   Identify the correct statement about the following reaction…

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7. Q21 2024

   Which one of the following reactions is different from the remaining three ?

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8. Q22 2024

   When magnesium ribbon is burnt in air, an ash of white colour is produced. Write chemical equation for the…

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9. Q23 2024

   When 2 mL of sodium hydroxide solution is added to few pieces of granulated zinc in a test tube and then…

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10. Q27 2023

    When aqueous solutions of potassium iodide and lead nitrate are mixed, an insoluble substance separates out.…

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11. Q31 2023

    In order to balance the following chemical equation, the values of the coefficients x and y respectively are…

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