CBSE Class 10 · Science

Chemical Substances - Nature and Behaviour

54 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 54 questions

  1. Which of the following chemical reactions represents a double displacement and precipitation reaction?
  2. What chemical compound is formed when chlorine gas is passed through dry slaked lime during industrial production of bleaching powder?
  3. Which of the following metals does NOT react with either cold water or hot water, but reacts only with steam to produce metal oxide and hydrogen gas?
  4. What is the pH range within which the human body normally functions to maintain physiological homeostasis?
  5. In the electrolytic refining of copper, what is connected to the positive terminal (anode) of the electrolytic cell?
  6. Which functional group is present in the organic compound butanone?
  7. What gas is liberated when ethanoic acid reacts with sodium carbonate or sodium hydrogen carbonate?
  8. Why is plaster of Paris stored in moisture-proof containers?
  9. Which of the following non-metals is a liquid at room temperature?
  10. Which of the following processes involves a chemical reaction?
  11. What happens when dilute hydrochloric acid is added to iron filings?
  12. When lead(II) nitrate powder is heated in a dry boiling tube, which observations are noted?
  13. In the reaction: , identify the substance oxidized and the oxidizing agent.
  14. A shiny brown-colored element 'X' on heating in air becomes black in color. Name the element 'X' and the black-colored compound formed.
  15. Why is respiration considered an exothermic reaction in biological systems?
  16. What type of chemical reaction occurs when quicklime is added to water?
  17. Which antioxidant gas is commonly flushed into bags of potato chips to prevent rancidity of fats and oils?
  18. When barium chloride solution is added to sodium sulphate solution, a white precipitate is formed. What is the chemical formula of the white precipitate?
  19. Electrolysis of water is a decomposition reaction. What is the mole ratio of hydrogen to oxygen gas liberated at the electrodes?
  20. Which of the following compounds turns black when exposed to sunlight due to photochemical decomposition?
  21. What is the chemical name and formula of bleaching powder?
  22. What is the chemical formula of Plaster of Paris and how is it obtained from gypsum?
  23. What is the chemical formula and common name of sodium hydrogencarbonate?
  24. Tooth enamel is the hardest substance in the human body. What chemical compound is it made of?
  25. Which acid is naturally present in nettle leaves that causes a painful stinging sensation?
  26. What is the nature of an aqueous solution of ammonium chloride?
  27. How does the dilution of an acid affect the concentration of hydronium ions () per unit volume?
  28. Which indicator turns pink in basic solutions and remains colorless in acidic solutions?
  29. What is the chlor-alkali process and which three commercially vital products are generated during it?
  30. How many molecules of water of crystallization are present in washing soda?
  31. Which of the following oxides is amphoteric in nature?
  32. Which metal does not react with cold water, hot water, or steam, but is higher in reactivity than gold?
  33. Why is sodium kept immersed in kerosene oil?
  34. What is aqua regia and what is the ratio of its constituent concentrated acids?
  35. Why do ionic compounds have high melting and boiling points?
  36. What is the difference between roasting and calcination in metallurgy?
  37. What reaction is used in thermite welding to join railway tracks and cracked machine parts?
  38. In electrolytic refining of copper, what are the anode, cathode, and electrolyte used?
  39. An alloy of mercury with any other metal is termed as:
  40. Why does copper turn green when exposed to moist air over long periods of time?
  41. Galvanization is a method of protecting steel and iron from rusting by coating them with a thin layer of:
  42. Which non-metal is lustrous and has a metallic shine?
  43. What are the two versatile properties of carbon that lead to the formation of millions of organic compounds?
  44. What is the general formula of the homologous series of alkenes?
  45. How many structural isomers are possible for the alkane pentane ()?
  46. What reaction takes place when ethanol is heated with concentrated sulfuric acid at ?
  47. What is the role of alkaline potassium permanganate () or acidified potassium dichromate in the oxidation of ethanol?
  48. What is the esterification reaction and what characteristic physical property distinguishes esters?
  49. What is saponification in organic chemistry?
  50. In a soap micelle, how are the soap molecules oriented when cleansing grease in water?
  51. Why do soaps form an insoluble precipitate (scum) in hard water while synthetic detergents do not?
  52. What catalyst is used in the industrial hydrogenation of vegetable oils to produce solid vegetable ghee?
  53. What is the product formed when ethanoic acid reacts with sodium carbonate?
  54. Which property of diamond explains why it is an electrical insulator while graphite conducts electricity?

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