FORM TWO CHEMISTRY NECTA 2010

THE UNITED REPUBLIC OF TANZANIA NATIONAL EXAMINATION COUNCIL

CHEMISTRY FTNA 2018

(i) 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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 (ii)   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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  (iii)   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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 (iv)  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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 (v)  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
Choose Answer :


 (vi)   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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 (vii)  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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(viii)Petrol is an example of:

           A.corrosive substance         

          B. flammable substance 

          C. irritating substance   

          D. toxic substance

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 (ix)    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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(x)The most abundant element on the earth is:

A.carbon  

 B. iron

 C. nitrogen  

 D. oxygen

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