Chemistry Past Questions

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11
When heat is absorbed during a chemical reaction, the reaction is said to be
  • A. thermodynamic
  • B. exothermic
  • C. isothermal
  • D. endothermic
  • E. thermostatic
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12
When large hydrocarbon molecules are heated at high temperature in the presence of a catalyst to give smaller molecules, the process is known as
  • A. disintegration
  • B. polymerization
  • C. cracking
  • D. degradation
  • E. distillation
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13
The pH of four solutions W, X, Y, Z are 4, 6, 8, 10 respectively, therefore
  • A. none of these solutions is acidic
  • B. the pH of Y is made more acidic by addition of distilled water
  • C. Z is the most acidic solution
  • D. W is the most acidic solution
  • E. X is neutral
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14
When each of the nitrates of Potassium, Magnesium and iron is heated,
  • A. all the nitrates decompose to their oxides
  • B. the nitrate of magnesium gives the nitrite and oxygen
  • C. the nitrates of iron magnesium and iron give the oxides
  • D. the nitrate of iron gives the nitrite and oxygen
  • E. the nitrate of the magnesium is not decomposed
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15
Which of the following metals cannot replace hydrogen from water or steam?
  • A. Sodium
  • B. Magnesium
  • C. Iron
  • D. Calcium
  • E. Copper
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