UP Board Class 10 chemical_reactions — practice questions
17 free MCQs with worked solutions. Tap any question for the answer + explanation, or practice them all in the app.
Practice UP Board Class 10 chemical_reactions in the app →Which observation does NOT necessarily indicate a chemical reaction?Balance: H₂ + O₂ → H₂O.Which principle requires us to balance chemical equations?Balance: Fe + H₂O → Fe₃O₄ + H₂.In Zn + 2 HCl → ZnCl₂ + H₂, the state symbol for HCl in solution is:CaCO₃ → CaO + CO₂ is an example of which type of reaction?In Fe + CuSO₄ → FeSO₄ + Cu, what kind of reaction is this?2 H₂ + O₂ → 2 H₂O is a:In the reaction Na₂SO₄ + BaCl₂ → BaSO₄ + 2 NaCl, what is observed?Which of these is an endothermic reaction?Which reaction does NOT need heat to proceed?In the reaction CuO + H₂ → Cu + H₂O, the substance that is reduced is:A reaction in which one substance is oxidised and another reduced is called a:Rusting of iron requires which two conditions?Chips packets are flushed with nitrogen mainly to:In ZnO + C → Zn + CO, the reducing agent is:Silver objects turn black on long exposure to air mainly because: