(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.

(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.

(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.

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

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

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

1.   CH₄ B
2.    C3H 8      
3.   ^C4^H₁₀      
4. C6H 12        
5.  C2H 12.

(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.

(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 + .

(viii)          Hygroscopic and deliquescent substances can be used as

1.  oxidising agents  
2.  drying agents   
3. reducing agent
4.  weak electrolytes  
5.   catalyst.

(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.

(x)                Water can be obtained from a solution of common salt by

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