2017/2018 WAEC GCE EXPO: CHEMISTRY THEORY AND OBJ QUESTIONS AND ANSWERS NOW AVAILABLE HERE

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=======Question 1
(a)  Graham's law of diffusion states that at a constant temperature and pressure, the rate of
       diffusion of a gas is inversely proportional to the square root of its density.

(b)  ¶ Pressure
       ¶ Temperature

(c)  3CL2(g) + 6KOH(aq) --> KClO3(aq) + 5KCL(aq) + 3H2O(l)

(d)  ¶ Trioxocarbonate(iv) acid  [H2CO3]
       ¶ Ethanoic acid [CH3COOH]

(e)  ¶ Nature of reactants
       ¶ Temperature of reaction mixture
       ¶ Presence of catalyst

(f)  ¶ High melting and boiling points
      ¶ Hard, dense and lustrous
      ¶ Good conductors of heat and electricity

(g)  Given: V1 = 153cm³,  V2 = ?,  T1 = 21°C (294K) ,  T2 = 45°C (318K)
                  At constant pressure, Charles law is:
                  V1/T1 = V2/T2
                  153/294 = V2/318
                  Cross multiplying,
                  294V2 = 153 × 318
                  294V2 = 48654
                         V2 = 48654/294
                         V2 = 165.5 cm³

(h)  (i).  A normal salt is that which is formed when all the replaceable hydrogen ions in an acid have
             been completely replaced by metallic ions.
       (ii). An example of a normal salt is *NaCl* formed from HCl and NaOH

(i)  ¶ Greater resistance to chemical attack than their constituent metals
      ¶ Higher tensile strength

(j)  (i). The basicity is two(2)
     (ii).  H2SO3(aq) --> 2H^+(aq) + SO3²-(aq)

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