Class 10 Science
17 Practice Questions — The answers are hidden. Reveal them to check your answers. The Timed Test will be available in Phase 3.
1) Combination: A + B → AB, e.g. 2H₂ + O₂ → 2H₂O.
2) Decomposition: AB → A + B, e.g. 2HgO → 2Hg + O₂.
3) Displacement: A + BC → AC + B, e.g. Zn + CuSO₄ → ZnSO₄ + Cu.
4) Double displacement: AB + CD → AD + CB, e.g. AgNO₃ + NaCl → AgCl↓ + NaNO₃.
Many of these can also be redox if electrons are transferred.
Board answers score better when each type has a labelled equation.
Acids produce H⁺ (or H₃O⁺) in water, taste sour, turn blue litmus red — e.g. lemon juice / HCl.
Bases produce OH⁻, feel soapy, turn red litmus blue — e.g. soap solution / NaOH.
They neutralise each other to give salt and water.
Mention one strong and one weak example if the question has marks for that.
These practice sets use original GKSchools wording — they are not a verbatim dump of the NCERT textbook. “Important” means high-weight practice for the chapter, not a claim that these are previous-year exam questions.
Follow this loop every day: mixed test, current affairs, then today's subject. A new set arrives tomorrow.
After this page, use these three links — do not open a random page.
More sets from the same cluster — stay on this topic.
Timed papers with a scorecard — start any time, then return to a related quiz above.
