FORM TWO CHEMISTRY NECTA 2010

In scientific study, the tentative explanation for the observed chemical phenomenon can be proved by:

  1. Data analysis
  2. Experimentation
  3. Hypothesis
  4. Observation
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A certain liquid dissolves copper (Il) sulphate to form a blue solution. This liquid is likely to be:

  1. Hydrochloric acid
  2. Liquid oxygen
  3. Nitric acid
  4. Water
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When a chemist studies a substance he/she is interested in its:

  1. Force of attraction
  2. Properties
  3. Shape
  4. Smell
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The boiling point of pure water at sea level is 1000C and that of ethanol is 780C. The mixture of ethanol and water can be separated by:

  1. Filtration process
  2. Fractional distillation process
  3. Layer separation process
  4. Sublimation process
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The boiling point of pure water at sea level is 1000C and that of ethanol is 780C. The mixture of ethanol and water can be separated by:

  1. Filtration process
  2. Fractional distillation process
  3. Layer separation process
  4. Sublimation process
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Which group among the following elements are metals?

  1. Calcium, magnesium and sodium
  2. Calcium, hydrogen and nitrogen
  3. Calcium, carbon and magnesium
  4. Oxygen, potassium and sodium
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An electrovalent bond is formed by:

  1. Arrangement of electrons
  2. Sharing of electrons
  3. Transfer of electrons
  4. Vibrations of electrons
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Petrol is an example of:

  1. corrosive substance
  2. flammable substance
  3. irritating substance
  4. toxic substance
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The electronic configuration of silicon is:

  1. 2:7:3
  2. 2:8:2
  3. 2:8:3
  4. 2:8:4
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The most abundant element on the earth is:

  1. carbon
  2. iron
  3. nitrogen
  4. oxygen
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