Here, you are provided chemical Reactions and Equations class 10 extra questions, which will be very useful and helpful for you. You should prepare notes yourself and practice them well. You should also go through activity solutions with an explanation.
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| Chemical Reactions and Equations Class 10 Extra Questions |
Chemical Reactions and
Equations Class 10 extra questions consist of chemical reactions and its types,
chemical equations, balancing chemical equations, rancidity and corrosion etc.
If you find any
difficulty in finding answers to class
10 science chapter 1 extra questions, then go through NCERT solutions of
class 10 science or you can comment in the comment section, we will be
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Chemical Reactions and Equations Class 10 Extra Questions
Class 10 Chemistry Chapter 1 Extra Questions1. Define the following terms with a suitable example –i. Combination reactionii. Decomposition reactioniii. Displacement reactioniv. Exothermic reactionv. Endothermic reactionvi. Oxidationvii. Reductionviii. Precipitation reactionix. Double displacementx. Redox reaction2. Identify the following reactions and give their name –- i. N2 + H2 → NH3 ii. H2O → H2 + O2 iii. CaCO3 → CaO + CO2 iv. AgNO 3 + NaCl → AgCl + NaNO3 3. What happens when –( Give the chemical equation for the following reactions) i. Calcium carbonate (CaCO3) is heated. ii. Copper is burnt in the air. iii. Magnesium wire is burnt. iv. Natural gas burns. v. Quick lime reacts with water. vi. Iron nails are put in the solution of copper sulphate. vii. Lead nitrate is heated viii. Silver chloride is kept in sunlight ix. Silver bromide is kept in sunlight x. Ferrous sulphate is heated xi. Carbon dioxide is passed through lime water 4.
Name any two elements which are more reactive
than copper. 5.
Write the chemical formula of marble. 6.
Write a chemical reaction that is used in
various industries? 7.
Give the equation for the reaction used in
respiration? 8. Identify the substance that is oxidized and substances that are reduced in the following reactions- i. 4Na + O2 → 2N2O ii. CuO +H2 → Cu+H2O 9. Write the chemical equations for the following statements-- i. Hydrogen gas combines with nitrogen to form ammonia. ii. Barium chloride reacts with aluminium sulphate to give aluminium chloride and barium sulphate. 10. Define the following- i. Word equation ii. Skeletal equation iii. Corrosion iv. Rancidity 11. Why does the colour of copper sulphate
solution change when an iron nail is dipped in it? 12. What information do we get from a balanced
chemical equation? 13. In a container, solid calcium oxide was taken and water was added slowly to it. a. State two observations made in the experiment. b. Write the name and chemical formula of the product formed. 14. Why should magnesium ribbon be cleaned before
burning in air? 15. Which type of reaction is the decomposition of
vegetables? 16. How can you identify that a chemical reaction
has taken place? 17. Why decomposition reactions are called the
opposite of combination reactions? Give equations for these reactions. 18. Write one equation each for decomposition
where energy is supplied in the form of heat, light and electricity. 19. In the refining of silver, the recovery of
silver nitrate solution involved displacement by copper metal. Write the
reaction involved. 20. Why do apply paint of iron articles? 21. Oil and fat-containing food items flushed with
nitrogen, why? 22. Describe an activity for the electrolysis of
water and draw the diagram for it? 23. How does the concentration of H3O+
ions get affected, when a solution of an acid is diluted? 24. Why does dry HCl not change the colour of dry
litmus? 25. An element burns in the air with a white dazzling
flame and converts into a white powder. Name the element and give the reaction
also. 26. How can you prepare hydrogen gas in a laboratory? Give the reaction and draw the diagram. 27. What is a reactant? 28. What is the product? 29. What is a precipitate? 30. What is a skeletal reaction? 31. Why should we balance a chemical reaction? 32. What is the “law of conservation of mass”? 33. Name the solution which is used for whitewashing? 34. Why do the walls look shiny after two to three days
of whitewashing? 35. Write the equation of burning coal? 36. Write the equation of the formation of water? 37. Write the equation of burning of natural gas
(methane)? 38. Write the chemical formula of marble? 39. Name the substance which is used in
manufacturing cement? 40. Write the difference between oxidation and
reduction. 41. Write the name and formula of the following – i. Limestone ii. Quick lime iii. Slaked lime 42. How can you say respiration is an exothermic reaction? Give the reaction also. 43. A green colour crystal is heated and its
colour change after losing water. Name the substance and give the reaction
also. 44. Name
the substance which is used in manufacturing cement? 45. Explain the electrolysis of water. Draw the
diagram also. 46. Match the following- i. Green crystals black and white photography ii. Brown fumes solution of slaked lime iii. White powder nitrogen dioxide iv. Quick lime magnesium oxide v. Whitewashing ferrous sulphate vi. Decomposition of calcium oxide silver chloride or silver bromide
47. Why copper (brown) turns black on heating in
air? Give the reaction also. 48. Why the black colour of copper oxide turns brown
on passing hydrogen? Give the reaction also. 49.Complete the following reactions- i. CO + 2H2
ii. CO2 + H2O iii.CaO + H2O → X iv. CH4 +2O2 → X + Y v. Ca(OH)2 + X →CaCO3 + H2O vi. 2FeSO4 vii. X
50.What changes occur during a chemical reaction? 51.What happens when- [ Annual board exam-2013] i. CuSO4 (aq) +Fe(s)→ ? ii. Zn (s) +H2SO4 (l) → ? iii. Na (s) + O2 (g) → ? 52. Write the difference between displacement and
double displacement reactions. [ Annual board exam-2013] 53. Write the balanced equation of combustion of
methane. [ Annual board exam-2013] 54. What is decomposition reaction? Write the
chemical reaction of the thermal decomposition of calcium carbonate. [ Annual board
exam-2012] 55. Write the method of electrolysis of water.
Give its necessary chemical reaction and draw a labelled diagram.[ Annual board exam-2012] 56. What is a combination reaction? Write the
chemical reaction of the burning of coal.
[ Annual board exam-2012] 57. Write
the method of preparation of slaked lime. Give its chemical reaction and
labelled diagram also. [ Annual board exam-2012] 58. When lead nitrate is heated, brown fumes emit.
Name the evolving gas. 59. Write
one equation each for decomposition reaction where energy is supplied in the
form of heat, light and electricity. 60. Name the compound which is decomposed by
absorbing light. 61. A shiny brown coloured element ‘X’ on heating
in the air becomes black in colour. Name the element ‘X’ and the black coloured compound
formed. 62. What do the symbols (↑) and (↑) represent in a
chemical equation? 63. What type of reaction takes place in the digestion
of food? 64. What type of reaction takes place during
respiration? 65. What type of reaction takes place in the rotting
of vegetable matter? 66. Write the types of reaction in the following- i. Reaction between acid and base ii. Rusting of iron 67. How can we prevent rancidity? 68.A, B and C are three elements that undergo chemical changes according to the following equations: a. A2O3 + 2B →B2O3 +2A b. 3CSO4 +2B →B2(SO4)3 +3C c. 3CO +2A → A2O3 + 3C 69. What is rust? 70. Why antioxidants are added to fatty foods? 71. Why nitrogen is flushed to bags of chips? 72. How does the food become rancid? 73. What is the law of conservation of mass? 74. When potassium iodide solution is added to a
solution of lead(II) nitrate in a test tube, a precipitate is formed? 75. An iron knife 76. Why respiration is considered an exothermic
reaction? Explain. 77. Convert the following statement in an equation and then balance- i. Hydrogen sulphide gas burns in the air to give water and sulphur dioxide. ii. Hydrogen gas combines with nitrogen to form ammonia iii. Barium chloride reacts with aluminium sulphate to give aluminium chloride and barium sulphate iv. Potassium metal reacts with water to give potassium hydroxide and hydrogen 78. Write the balanced equation for the following word equation--- i. Calcium hydroxide + carbon dioxide calcium carbonate + water You
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