This question was attempted by most  candidates and the performance was good.
                                                                                                                                            
In(a)(i), candidates correctly gave one example each of I – III from the list of examples thus: 
            I.          FeCl3 /KOH/CaCl2/NaOH/MgCl2/P2O5.
            II.         CuO/CoCl2/conc H2SO4/ silica gel/CuSO4.
            III.       Na2CO3 IOH2O/ Na2SO4  IOH2O /MgSO4   7H2O .

IUPAC names of any of the compound was accepted instead of the formula.

In (a)(ii), candidates gave three products of the destructive of coal from the following:

1. coke
2. ammoniacal liquor
3. coal tar
4. coal gas

 

In(a)(iii), candidates correctly gave two uses of graphite from among the following uses:

1. as lubricant
2. as electrodes
3. for making lead pencils
4. moderators in nuclear reactors

 

In(b)(i), candidates correctly wrote a balanced chemical equation for the complete reaction thus:

            H2SO4(aq)  +    2NaOH(aq) →   Na2SO4(aq) +  2H2O(l), 

In(b)(ii), candidates correctly stated that the reaction is neutralization.

In(b)(iii), majority of the candidates could correctly calculate the number of moles of sodium hydroxide required for a complete reaction as follows:

No. of moles of H2SO4   =   20 x 0.125
                                                1000
                                       =    0.0025 moles

1 mole of H2SO4  Ξ       2  moles of NaOH
                                      
∴   0.005 moles of  H2SO4  Ξ       2 x  0 . 0025   moles of NaOH
                                                              1
                                         =    0.005 moles of NaOH.

Other correct method were accepted.
                                                                                                                                           

In (b)(iv), only few candidates could correctly outline how a solid sample of the product of the reaction in (b)(iii) could be obtained.  The expected answer from candidates is as stated below:

1. put solution into evaporating dish
2. heat to concentrate/evaporate
3. obtain the solid/allow to cool and crystallize.

 

In (c)(i), most candidates could not draw resonance structure of benzene.  The correct structures expected from candidates are as follows:

 

 

 

 

 

 

In (c)(ii), only few candidates knew that benzene undergoes substitution and addition reactions.

In (c)(iii), most candidates gave chemical properties of benzene instead of physical properties:  The expected answers were as follows:

1. colourless liquid
2. less dense than water
3. insoluble in polar solvents/soluble in organic solvents
4. has boiling point of 80ºC.