Practice Questions – Chemical Reactions and Equations (Class 10, CBSE)(mock test -30) A. Multiple Choice Questions (MCQs) Which of the following is an endothermic reaction? a) Burning of coal b) Respiration c) Photosynthesis d) Condensation of steam Which law is followed while balancing chemical equations? a) Law of definite proportion b) Law of multiple proportion c) Law of conservation of mass d) Law of constant composition Which of the following is a double displacement reaction? a) Zn + H2SO4 → ZnSO4 + H2 b) 2H2O → 2H2 + O2 c) Na2SO4 + BaCl2 → BaSO4 + 2NaCl d) CH4 + 2O2 → CO2 + 2H2O Which of the following shows a chemical change? a) Melting of ice b) Burning of candle c) Dissolving sugar in water d) Breaking glass In the reaction: 2Mg + O2 → 2MgO Which substance is oxidized? B. Assertion-Reason Questions For each question, choose: (a) Both A and R are true, R is the correct explanation (b) Both A and R are true, but R is not the corr...
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