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Science Mock test papers


 


Chemical reaction and equation


 



  1. What happens when magnesium ribbon burns in air?
  2. What do you mean by physical and chemical change.
  3. When do you say that a chemical reaction has taken place?
  4. What do you mean by word equation.
  5. List four observations that help us to determine whether a chemical reaction has taken place.
  6. What do you mean by skeletal equation.
  7. Why do we balance a chemical equation?
  8. What is hit and trial method of balancing chemical equation?
  9. Give two limitation of chemical equation and how can we overcome these limitation.
  10. What does the word aq. represent in a chemical equation.
  11. What actually happen during a chemical reaction?
  12. Why water starts boiling if lime is added to it.
  13. The glucose combines with oxygen in our body cells and provides energy. What is the special name of this reaction?
  14. According to energy change what type of reaction is decomposition of vegetable matter into compost.
  15. Give two precautions you take while decomposition reaction of ferrous sulphate.
  16. Is lime natural of man-made substance? Give one use of it.
  17. Name a brown coloured gas that evolved by decomposition reaction of lead nitrate.
  18. Why during electrolysis of water some drops of sulphuric acid is added.
  19. In what ratio hydrogen and oxygen formed during electrolysis of water.
  20. At which electrode hydrogen is collected during electrolysis of water.
  21. Why does silver chloride is stored in dark coloured bottles.
  22. Give formula of ferrous sulphate crystal. Give two changes occur when its crystalline form is heated.
  23. What are precipitates?
  24. A reddish brown element X on heating converted into a black coloured compound Y, which turns phenolphthalein pink. Give interconversion reaction of X and Y.
  25. What is rancidity? Give four methods to slow down it.
  26. What does a complete chemical reaction represent?
  27. What do you mean by oxidation-reduction reaction. Give an example to explain this.
  28. Name three forms in which energy is utilized during decomposition reaction.
  29. What are antioxidants?
  30. What happens when:

    1. Steam is passed through red-hot iron.
    2. Carbon monoxide reacts with hydrogen at 340 atm.
    3. Coal is burnt
    4. Natural gas is burnt.
    5. Manganese dioxide reacts with hydrochloric acid.
    6. Zinc oxide is heated with coke.

Write balanced chemical equation for all the above.



  1. Name a silver salt used in black and white photography.

 



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