Chemistry Ncert Level -02 - B- 50Q
1. What is "milk of magnesia" chemically?
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2. The acid used in lead storage cells is –
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3. Milk tastes sour when kept in the open for sometime due to the formation of –
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4. Which of the following is a natural dye?
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5. The ratio of pure gold in 18 carat gold is
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6. What is the process in which acids and bases react to form salts and water.
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7. The gas usually causing explosions in coal mines is –
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8. Which is the purest form of iron?
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9. Which of the following metals form an amalgam with other metals?
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10. Petroleum is a mixture of –
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11. The gas used for filling weather balloons is –
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12. An emulsion is a colloid of a –
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13. Percentage of carbon in steel ranges from –
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14. Which of the following gases makes bread or cake rise making them soft and spongy?
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15. Candle is a mixture of –
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16. German silver, an alloy, does not contain the metal –
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17. Oxygen which is vital for life is a product of photosynthesis and comes from –
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18. What is the purpose of adding baking soda to dough?
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19. Gobar gas mainly contains –
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20. The chief constituent of vinegar is –
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21. Commercial Vaseline is derived from -
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22. Colour imparted to the Bunsen flame by strontium salt is -
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23. Name the particle that is most essential to continue the chain reaction during the fission of uranium -
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24. Which one amongst the following is not a Green House gas?
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25. The element used in the manufacture of safety matches is –
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26. The main source of Naphthalene is -
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27. The material used in solar cells contains
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28. Quartz is a crystalline form of -
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29. In vulcanisation process, rubber can be hardened by adding -
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30. Urea is a -
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31. During inter conversion of energy from one form to other forms, total energy at any time remains–
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32. Which of the following is a physical change?
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33. Sea weeds are important source of –
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34. Which gas is used to manufacture vanaspati from vegetable oil is -
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35. The pH of a neutral solution is -
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36. The nucleus of an atom consists of -
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37. Detergents are –
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38. The noble gas used in radiotherapy is
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39. Ethanol containing 5% water is known as –
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40. The important ore of aluminium is –
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41. Which of the following is not present in German-silver?
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42. The major harmful gas emitted by automobile vehicles which causes air pollution is –
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43. Who discovered the atom bomb?
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44. The major component of honey is -
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45. A body moving in a circular path with a constant speed has a -
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46. What is a multibranched polysaccharide of glucose that serves as a form of energy storage in animals and fungi.
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47. Potassium Permanganate is used for purifying drinking water, because
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48. Diamond is harder than graphite because of –
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49. Gobar gas contains mainly –
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50. What is the most commonly used substance in fluorescent tubes?
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