Question

I.CHOOSE THE CORRECT ANSWER: 1. Formation of gas bubbles is a _____________ a) physical change b) chemical change c) physical reaction d)chemical reaction 2. The process of obtaining salt by the evaporation of seawater involves ______________ a) galvanization b) crystallization c) sublimation d) sedimentation 3. When carbon dioxide is passed through lime water, it turns into ____________________ a) grey b) blue c) golden d) milky 4. Turning milk into curd is _______________ a) physical change b) chemical change c) physical reaction d)chemical reaction 5. Which of the following is a chemical change? a) Boiling of water b) tearing of newspaper c) cooking of vegetable d) freezing water into ice 6. Which of the following statements is correct? a) When coal is burnt no new substance is produced b) Rust is not formed in the absence of air or oxygen c) The fizz that comes out when a soda bottle is opened is due to a chemical change. d) Respiration is a physical process 7. In which one of the following situations chemical reaction does not occur? a) Common salt is exposed to air b) Coal is burnt in air c) Sodium is placed in water d) Iron is kept in moist air 8. What is the formula of rust? a) Fe2O3 b) Fe2O4 c) FeO d) Fe2O 9. Look at the following diagram carefully and answer the following question Rusting of the iron nail will be faster in which of the following test tubes. a) A b) Both A and B c) B d) Equal in A, B, and C 10. A metal when left exposed to the atmosphere for some time gets coated with green basic carbonate. The metal in question is a) Copper b) Nickel c)Silver d) Zinc

Answer 1

Answer:

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Answer 2

1.physical change

2.crystallization

3.milky

4.chemical reaction

5.cooking of vegetables

6.rust is not formed in the absence of oxygen and water

7.common salt when exposed to air

8.fe2o3

9.water and air

10.copper

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