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Acids, Bases and Salts

CBSE Class 10 · Science · 29 past questions

  1. Q1 2026
    Which one of the following can be used as an acid-base indicator by a visually impaired (blind) student ?
  2. Q2 2026
    The natural sources of oxalic acid, lactic acid and methanoic acid respectively are…
  3. Q3 2026
    To a small amount of copper oxide in a beaker, when we add dilute hydrochloric acid slowly with stirring, the…
  4. Q4 2026
    In which case/cases will the bulb glow considering that all other connections of electric circuit are… (with a figure)
  5. Q5 2026
    When zinc reacts with NaOH, the product formed is…
  6. Q6 2026
    A metal carbonate reacts with a solution X which forms a salt, water and a gas Y. What are X and Y ?
  7. Q7 2026
    The pH of the gastric juices released during digestion is…
  8. Q8 2026
    Baking powder is a mixture of…
  9. Q9 Sample paper 2026-27
    Rishita summarizes the chlor-alkali process in the following table.…
  10. Q10 Sample paper 2026-27
    The following question consists of two statements – Assertion (A) and Reason (R). Answer this question by…
  11. Q11 Sample paper 2026-27
    Give reason for the following…
  12. Q12 2025
    The warning sign shown in the given figure must invariably be displayed/pasted on the containers which… (with a figure)
  13. Q13 2025
    The body of human beings works within the pH range of…
  14. Q14 2025
    Which of the given option represents a family of salts ?
  15. Q15 2025
    For Questions number 17 to 20, two statements are given — one labelled as Assertion (A) and the other…
  16. Q16 2025
    Consider the following reactions…
  17. Q17 2024
    Juice of tamarind turns blue litmus to red. It is because of the presence of an acid called…
  18. Q18 2024
    The oxide which can react with HCl as well as KOH to give corresponding salt and water is
  19. Q19 2024
    Select a pair of natural indicator from the following…
  20. Q20 2024
    A chemical compound used in glass, soap and paper industries is
  21. Q21 2024
    Consider the following compounds…
  22. Q22 2024
    For Q. Nos. 17 to 20, two statements are given – One labelled as Assertion (A) and the other labelled as…
  23. Q23 2023
    In the experimental setup given below, it is observed that on passing the gas produced in the reaction in the… (with a figure)
  24. Q24 2023
    The table below has information regarding pH and the nature (acidic/basic) of four different solutions. Which…
  25. Q25 2023
    When Sodium bicarbonate reacts with dilute hydrochloric acid, the gas evolved is…
  26. Q26 2023
    Acid present in tomato is…
  27. Q27 2023
    Sodium hydroxide is termed an alkali while Ferric hydroxide is not because…
  28. Q28 2023
    The name of the salt used to remove permanent hardness of water is…
  29. Q29 2023