ICSE Class 8 Chemical Reactions — practice questions
20 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice ICSE Class 8 Chemical Reactions in the app →A chemical reaction in which two or more substances combine to form a single new substance is called:The observation of bubbling or effervescence during a reaction indicates:A neutralisation reaction always produces:A substance that changes the rate of a reaction but remains chemically unchanged at the end is called:The chemical equation Zn + H₂SO₄ → ZnSO₄ + H₂ is an example of a:A reaction that releases heat to the surroundings is called:When iron is placed in a blue copper sulphate solution, the solution turns greenish-blue. This colour change iThe reaction 2HgO → 2Hg + O₂ is an example of a:The reaction AgNO₃ + NaCl → AgCl↓ + NaNO₃ is best classified as a:In the decomposition of potassium chlorate (2KClO₃ → 2KCl + 3O₂), manganese dioxide is added. It acts as a:An insoluble solid that separates from a solution during a chemical reaction is called:In the reaction Na₂CO₃ + Heat → Na₂O + CO₂, the energy requirement makes the reaction:The reaction 2H₂O → 2H₂ + O₂ in sunlight is an example of a:Which of the following pairs correctly shows an enzyme and its function inside the human body?Which of the following equations represents a balanced double-displacement reaction?When phosphoric acid is added to hydrogen peroxide, it slows the decomposition of H₂O₂. Phosphoric acid acts aWhich sequence correctly lists three indicators of a chemical change that occur together in Zn + H₂SO₄?Why does the colour of CuSO₄ solution fade when iron filings are added?In the decomposition Pb(NO₃)₂ → PbO + 4NO₂ + O₂, the equation as written is:During photosynthesis, plants use sunlight to convert CO₂ and water into glucose. This shows that light can: