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1 Class X Question bank Semester 1 1. Write the reaction that takes place when limestone is heated. 2. Give the characteristics of chemical changes 3. Why is a magnesium ribbon cleaned with sandpaper before it is burnt? 4. Why are bags containing food items flushed with nitrogen gas 5. Balance the following chemical equations. (a) (b) (c) (d) pg. 1 (e) 6. Name the gas which burns with a pop sound 7. What is Redox reaction? 8. What happens when electric current is passed through acidified water? 9. Which type of chemical reaction takes place when Barium hydroxide and Ammonium chloride, are mixed together in terms of heat released or absorbed? 10. Why stale food has a peculiar smell? 11. What change do you observe on the surface of copper when its powder is heated? 12. Name the products formed when silver bromide is exposed to sunlight? 13. What happens when calcium oxide reacts with water? Write the chemical equation of reaction involved. 14. What are alkalis? 15. How can the pain & irritation caused by the stung of honey bee relieved? 16. Give reason: Acid conduct electricity only in presence of water. 17. Why the tartaric acid added to baking soda in baking powder. 18. Why bee-sting causes pain & irritation? 19. Why curd & sour substances should not be kept in brass or copper vessels? 20. Name the components present in baking powder 21. While diluting an acid, why is it recommended that the acid should be added to water & not water to the acid? 22. Write the chemical name of Plaster of Paris?
2 23. What happens when the blue crystals of copper sulphate are heated? 24. How is the concentration of hydronium ion (H 3 O + ) affected when a solution of acids is diluted? 25. Fresh milk has a ph of 6. Write the change in ph when it turns into curd. 26. What will happen when sodium hydrogen carbonate is heated? Write the chemical equation of the reaction involved. 27. A milkman added a small amount of baking soda to fresh milk. Why? Give reason. 28. Why does distilled water not conduct electricity whereas rain water? 29. Why Plaster of Paris should be stored in a moisture proof container. Write a chemical equation of the reaction between plaster of Paris & water. 30. Define water of crystallization. Write the no. of water molecules present in one formula unit of copper sulphate. 31. A metal compound X reacts with dilute hydrochloric acid to produce effervescence. The gas evolved extinguishes a burning candle & turns lime water milky. Identify the gas evolved. Write a balanced chemical equation for the reaction if one of the compounds formed is CaCl What happens when metal carbonates & metal hydrogen carbonates reacts with acids. Write the word equation for each. 33. Under what soil condition do you think a farmer would treat the soil of his field with quick lime (CaO) or slaked time [Ca(OH) 2 ]? What should be the nature of soil for a healthy growth of plants? 34. Give reason: HCl, HNO, etc. Show acidic characters in aqueous solutions while alcohol & glucose solutions do not show acidic characters. 35. A sanitary worker uses a white chemical having strong smell of chlorine gas to disinfect the water tank. Identify the chemical compound. Write its chemical formula. Give the chemical equation for its preparation. 36. What is chlor-alkali process? Write the chemical reaction taking place in form of chemical equation. Name the gases given off at the anode & the cathode respectively. Write one use each of any two products produced in this process. 37. What is the nature of oxides formed by metals & non-metals? 38. Name two metals which do not reacts with water but react with steam. 39. What type of chemical bond is present in sodium chloride? 40. Which two metals liberate hydrogen gas when reacts with dilute Nitric acid. 41. Select a most reactive & least reactive metal from the following: Al, Ca, Zn, Fe, Hg, Cu. 42. What is an amalgam? 43. In electrolytic refining, name the electrode which is made of impure metals & the electrode which is mode of pure metals. 44. Why Aluminium cannot be obtained by the reduction of its ore with carbon. 45. What are amphoteric oxides? Give two examples of such oxides. 46. Why sodium chloride has high melting point? 47. Give reason:- Ionic compounds conduct electricity only in molten state not in solid state. 48. Explain why: Aluminium is more reactive than iron, yet its corrosion is less than iron. pg. 2
3 pg What is the function of mucus in gastric gland? What is the function of intestinal juice? 50. Why do we get muscle cramp after vigorous exercise? 51. Give two function of lymph. 52. What is the direction of flow of water in xylem and food in phloem? 53. Name the inter-mediate 3carbon molecule formed six carbon molecule of glucose during respiration. 54. Why rings of cartilage are present in trachea in throat region? 55. Herbivores have a longer small intestine as compared to carnivores. Explain in brief. 56. Explain double circulation in human being. 57. Write two important functions of transpiration in plants. 58. Give two main function of HCl present in gastric juice. 59. Write down three main steps of photosynthesis. 60. Which part of the brain is responsible for precision of voluntary action? 61. What is the impact of nervous electrical impulse upon muscle proteins? 62. What is synapse? 63. Define reflex action. 64. What is the effect of adrenalin on the beating of heart? 65. Write the name of two hormones responsible for bodily changes in boys and girls around the age of yrs. 66. A doctor advised a patient to take less sugar in her diet. Which disease is she suffering from? Which body organ and connective tissue is related with it? 67. Describe the feed back mechanism. 68. Define plant hormones. Write the important functions of the following: auxin, abscisic acid, gibberellins and cytokinin. 69. Describe different tropic movements with suitable examples. 70. Define One Ohm. 71. Define Resistivity 72. A bulb is rated at 5V, 100mA. Calculate its (1) Power (2) Resistance 73. Why are alloys mostly used in making electrical heating devices? 74. Which of the two has more resistivity: copper or glass? 75. Why is tungsten wire used almost exclusively for making filament in incandescent lamps? 76. Why is the series arrangement not used for domestic circuit? 77. Why is the bulb filament kept in a vacuum? 78. What are the advantages of connecting electrical devices in parallel with the battery instead of connecting them in series? 79. What is an electrical fuse? What is its use? 80. Why is lead-tin alloy used for making fuse? 81. What is the direction of the magnetic field lines outside a bar magnet?
4 pg In which direction the magnetic needle moves when placed over current carrying conductor, if the current flows from north to south? 83. How will the magnetic field change when the distance from the current carrying conductor is increased? 84. State right hand thumb rule. 85. What is a solenoid? 86. How does magnetic field change inside a long straight solenoid carrying current? 87. A current carrying conductor is placed perpendicular to magnetic field. In which direction does the conductor experience a force? 88. Name the magnet produced on inserting a soft iron core inside a current carrying solenoid. 89. What is the frequency of domestic AC supply in India? 90. What is Fleming s right hand rule? 91. Indicate the colors of neutral & live wire. 92. What do you mean by short circuiting of the circuit? 93. Which of the two requires a thin fuse wire; to draw A or A of current? 94. What is the principle of turbine? 95. Thermal power plants are set up near coal or oil fields, why? 96. What is the principle of hydrogen thermal power plant? 97. What is Bio Mass? 98. Which is the main gas present in Bio gas? 99. What is wave energy? 100. Out of C.N.G and hydrogen, which gas is cleaner? Expand C.N.G? 101. What is main source of energy in artificial satellite & space probes? 102. Name two appliances that use solar energy directly Name two types of energy which do not relate to the sun What is the good source of energy? 105. What are renewable sources of energy? Give two examples What are nonrenewable sources of energy. Give two examples What are disadvantages of burning fossil fuel? 108. Name two dams having strong opposition for their construction What are the main gases present in Bio gas?
5 110. What are advantages of Bio gas? 111. What are limitations of wind energy? 112. What is tidal energy? pg. 5
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