Chemistry Ncert Level -02 - B- 50Q
1. What is "milk of magnesia" chemically?
(1) Magnesium carbonate
(2) Sodium bicarbonate
(3) Calcium hydroxide
(4) Magnesium hydroxide
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2. The acid used in lead storage cells is –
(1) phosphoric acid
(2) hydrochloric acid
(3) nitric acid
(4) sulphuric acid
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3. Milk tastes sour when kept in the open for sometime due to the formation of –
(1) lactic acid
(2) citric acid
(3) acetic acid
(4) carbonic acid
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4. Which of the following is a natural dye?
(1) Crystal violet
(2) Aniline blue
(3) Alizarin
(4) Phenolphthalein
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5. The ratio of pure gold in 18 carat gold is
(1) 60%
(2) 75%
(3) 80%
(4) 90%
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6. What is the process in which acids and bases react to form salts and water.
(1) Neutralization
(2) Electrolysis
(3) Distillation
(4) Hydrolysis
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7. The gas usually causing explosions in coal mines is –
(1) Hydrogen
(2) Carbon monoxide
(3) Air
(4) Methane
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8. Which is the purest form of iron?
(1) Steel
2) Cast iron
(3) Pig iron
(4) Wrought iron
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9. Which of the following metals form an amalgam with other metals?
(1) Lead
(2) Tin
(3) Zinc
(4) Mercury
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10. Petroleum is a mixture of –
(1) elements
(2) hydrocarbons
(3) polymers
(4) salts
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11. The gas used for filling weather balloons is –
(1) helium
(2) hydrogen
(3) air
(4) nitrogen
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12. An emulsion is a colloid of a –
(1) gas in a liquid
(2) liquid in a liquid
(3) liquid in a gas
(4) gas in a solid
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13. Percentage of carbon in steel ranges from –
(1) 0.1 to 1.5
(2) 1.5 to 3.0
(3) 3.0 to 4.0
(4) 4.0 to 6.0
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14. Which of the following gases makes bread or cake rise making them soft and spongy?
(1) CO
(2) H2
(3) CO2
(4) O2
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15. Candle is a mixture of –
(1) Paraffin wax and stearic acid
(2) Bees wax and stearic acid
(3) Higher fat acids and stearic acid
(4) Bees wax and paraffin wax
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16. German silver, an alloy, does not contain the metal –
(1) Nickel
(2) Zinc
(3) Copper
(4) Silver
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17. Oxygen which is vital for life is a product of photosynthesis and comes from –
(1) carbonates from soil
(2) carbon dioxide
(3) water
(4) oxides of mineral elements
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18. What is the purpose of adding baking soda to dough?
(1) To generate moisture
(2) To give a good flavour
(3) To give good colour
(4) To generate carbon dioxide
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19. Gobar gas mainly contains –
(1) Carbon dioxide
(2) Carbon monoxide
(3) Hydrogen sulphide
(4) Methane
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20. The chief constituent of vinegar is –
(1) Formic acid
(2) Acetic acid
(3) Salycylic acid
(4) Oxalic acid
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21. Commercial Vaseline is derived from -
(1) plant gums
(2) coal tar
(3) wool wax
(4) petroleum
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22. Colour imparted to the Bunsen flame by strontium salt is -
(1) bluish green
(2) apple-green
(3) brick red
(4) crimson red
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23. Name the particle that is most essential to continue the chain reaction during the fission of uranium -
(1) Electron
(2) Proton
(3) Neutron
(4) Positron
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24. Which one amongst the following is not a Green House gas?
(1) Nitrogen
(2) Carbon dioxide
(3) Carbon Monoxide
(4) Chloro fluoro carbons
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25. The element used in the manufacture of safety matches is –
(1) Phosphorous
(2) Magnesium
(3) Silicon
(4) Sulphur
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26. The main source of Naphthalene is -
(1) Charcoal
(2) Camphor
(3) Coal-tar
(4) Diesel
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27. The material used in solar cells contains
(1) Tin
(2) Silicon
(3) Caesium
(4) Thallium
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28. Quartz is a crystalline form of -
(1) Alumina
(2) Glass
(3) Silica
(4) Limestone
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29. In vulcanisation process, rubber can be hardened by adding -
(1) Nitrogen
(2) Silicon
(3) Sulphur
(4) Alcohol
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30. Urea is a -
(1) Sodium fertilizer
(2) Phosphatic fertilizer
(3) Nitrogenous fertilizer
(4) Potassium fertilizer
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31. During inter conversion of energy from one form to other forms, total energy at any time remains–
(1) constant
(2) zero
(3) increasing
(4) decreasing
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32. Which of the following is a physical change?
(1) oxidation
(2) reduction
(3) sublimation
(4) decomposition
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33. Sea weeds are important source of –
(1) iron
(2) chlorine
(3) bromine
(4) iodine
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34. Which gas is used to manufacture vanaspati from vegetable oil is -
(1) carbon dioxide
(2) nitrogen
(3) oxygen
(4) hydrogen
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35. The pH of a neutral solution is -
(1) 0-7
(2) 7
(3) 7-14
(4) None of the above
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36. The nucleus of an atom consists of -
(1) electrons and neutrons
(2) electrons and protons
(3) protons and neutrons
(4) All of the above
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37. Detergents are –
(1) Sodium salts of fatty acids
(2) Sodium salts of sulphonic acids
(3) Sodium salt of benzoic acid
(4) None of the above
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38. The noble gas used in radiotherapy is
(1) neon
(2) argon
(3) radon
(4) xenon
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39. Ethanol containing 5% water is known as –
(1) rectified spirit
(2) denatured spirit
(3) methylated alcohol
(4) power alcohol
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40. The important ore of aluminium is –
(1) bauxite
(2) cryolite
(3) fluorspar
(4) haematite
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41. Which of the following is not present in German-silver?
(1) Copper
(2) Nickel
(3) Silver
(4) Zinc
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42. The major harmful gas emitted by automobile vehicles which causes air pollution is –
(1) Carbon Monoxide
(2) Methane
(3) Carbon dioxide
(4) Ozone gas
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43. Who discovered the atom bomb?
(1) Madam Curie
(2) Pierre Curie
(3) Otto Hahn
(4) Albert Einstein
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44. The major component of honey is -
(1) glucose
(2) sucrose
(3) maltose
(4) fructose
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45. A body moving in a circular path with a constant speed has a -
(1) constant velocity
(2) constant acceleration
(3) constant kinetic energy
(4) constant displacement
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46. What is a multibranched polysaccharide of glucose that serves as a form of energy storage in animals and fungi.
(1) Cellulose
(2) Glycogen
(3) Pectin
(4) Chitin
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47. Potassium Permanganate is used for purifying drinking water, because
(1) it dissolves the impurities of water
(2) It is a sterilizing agent
(3) It is an oxidising agent
(4) It is a reducing agent
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48. Diamond is harder than graphite because of –
(1) difference in layers of atoms
(2) tetrahedral structure of diamond
(3) difference of crystalline structures
(4) None of these
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49. Gobar gas contains mainly –
(1) methane
(2) ethylene
(3) propylene
(4) acetylene
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50. What is the most commonly used substance in fluorescent tubes?
(1) Sodium oxide and argon
(2) Sodium vapour and neon
(3) Mercury vapour and argon
(4) Mercury oxide and neon
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