Chemical Reactions and Equations

Bihar Board Class 10 · Science · 19 past questions

1. Q1 2026

   The reaction in which heat is evolved along with the formation of products is called

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2. Q2 2026

   The reaction $2Cu + O_2 \longrightarrow 2CuO$ is which type of chemical reaction ?

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3. Q3 2026

   Which of the following is an oxidant ?

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4. Q4 2025

   Which of the following reactions is an example of decomposition reaction ?

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5. Q5 2024

   $Zn + CuSO_4 \rightarrow ZnSO_4 + Cu$…

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6. Q6 2024

   When magnesium ribbon is ignited, the flame produced by it is

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7. Q7 2023

   The reaction in which ions are exchanged is called

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8. Q8 2023

   Which of the following equations is not balanced?

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9. Q9 2023

   Which one of the following reactions occurs in the formation of curd from milk?

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10. Q10 2023

    $\mathrm{Fe_2O_3 + 2Al \rightarrow Al_2O_3 + 2Fe}$ is which of the following types of reaction?

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11. Q11 2022

    The reaction, $CaO + H_2O \rightarrow Ca(OH)_2$ is of which type ?

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12. Q12 2022

    What is the ratio of number of atoms of hydrogen and oxygen in a molecule of water ?

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13. Q13 2022

    What is the colour of silver iodide ?

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14. Q14 2022

    Respiration is which type of chemical reaction ?

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15. Q15 2020

    The substance which takes part in chemical reaction is called

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16. Q16 2020

    Equation $2H_2 + O_2 \rightarrow 2H_2O$ is a

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17. Q17 2018

    $Zn + CuSO_4 \to ZnSO_4 + Cu$…

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18. Q18 2018

    When Magnesium ribbon is ignited, the flame produced by it is -

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19. Q19 2016

    What type of reaction is CuO + H$_2$ → Cu + H$_2$O ?

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