FORM FOUR CHEMISTRY NECTA 2015

(i)                 The mass number of a carbon atom that contains six protons, eight neutrons, and six electrons is

  1.   6   
  2.  14  
  3.  8
  4. 12
  5.  20.
Choose Answer :


(ii)               How many moles of oxygen are required for the complete combustion of 2.2 g of C3H 8 to form carbon dioxide and water?

  1.  0.050 moles 
  2. 0.15 moles   
  3. 0.25 moles
  4.   0.50 moles  
  5.  0.025 moles.
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(iii)             In the graph below, curve 1 was obtained from the decomposition of 100 cm3 of 1.0M hydrogen peroxide solution catalysed by manganese (IV) oxide, 2H2O 2?2H            2O+O    2 .

 

 

Which alteration/change to the original experimental conditions would produce curve 2?

  1.  Lowering the temperature
  2.  Using less manganese IV oxide
  3. Increasing the temperature
  4. Adding some 0.1 M H2O   
  5.  Using a different catalyst.
Choose Answer :


(iv)              How long must a current of 4.00 A be applied to a solution of Cu (2a+q) to produce 2.0 grams of copper metal?

  1.  2.4x102s
  2. 1.5x103s
  3. 7.6x102s
  4. 3.8x102s
  5. 12x104s               
Choose Answer :


(v)                Which of the following hydrocarbons does NOT belong to the same homologous series as the others?

  1.   CH4 B
  2.    C3H 8      
  3.   C4H10      
  4. C6H 12        
  5.  C2H 12.
Choose Answer :


 

(vi)              A solution of pH 1.6 is best described as

  1. weak acid  
  2. strong base   
  3. weak base
  4.  strong acid
  5.  neutral solution.
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(vii)            Which among the following equations correctly shows the reaction between chlorine gas and water?

  1. Cl 2(g) + H 2 O (l) ? Cl 2(g)
  2. 2Cl 2(g) + 2H 2 O (l) ? 4Cl + O 2(g) + 2H 2(g)
  3. Cl 2(g) + H 2 O (l) ? HCl (aq) + HOCL (aq)
  4. 2Cl 2(g) + 2H 2 O (l) ? 2HOCl 2(aq) + H 2(aq)
  5. 2Cl 2(g) + 3H 2 O (l) ? Cl 2(g) + 2H 3 O + .
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(viii)          Hygroscopic and deliquescent substances can be used as

  1.  oxidising agents  
  2.  drying agents   
  3. reducing agent
  4.  weak electrolytes  
  5.   catalyst.
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(ix)              Which among the following pair of substances are allotropes?

  1. H 2 O and H 2 O 2
  2. 12 C and 14 C
  3. P 4 and P 8
  4. H 2 and 2H +
  5. H + and H 3 O.
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(x)                Water can be obtained from a solution of common salt by

  1.  evaporation 
  2.  simple distillation 
  3. filtration
  4. condensation 
  5.  fractional distillation.
Choose Answer :


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