Science 7 MCQs that will keep repeating, Exercises of Chemistry

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Keep Repeating (C hemistry) 1. Which of the following is a physical change? A. Rusting of iron B. Digestion of food C. Melting of ice D. Cooking of rice Answer: C 2. Which of the following is a chemical change? A. Melting of wax B. Boiling of water C. Dissolving sugar D, Burning of paper Answer: D 3. Which one of the following has the highest number of atoms? A. 1 mole of H, B. 1 mole of O, C. 1 mole of CO, D. 1 mole of CH, Answer: A 4. The chemical formula of quick lime is: A. Ca(OH), B. CaCO, Cc. CaO D. CaCl, Answer: C 3. Which of the following is a triatomic molecule? A. O, B. CO, Cc. HCI D. H, Answer: B 6, Which of the following is not a pure substance? A. Iron B. Water C, Air D. Carbon dioxide Answer: C 7. Which of the following methods is used to separate cream from milk? A. Filtration B. Evaporation C. Centrifugation D. Decantation Answer: C