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Part II 

 {Omit one group. Each question counts 10.) 



Group A 



6 (a) Outline a method by which pure silver nitrate could be obtained from a 

 silver coin. What other metal is present in the coin, and how may it 

 be identified ? 



{b) Give a method for the preparation of chlorine from common salt. 



7. (c) Name two metals, each of which yields two oxides, and give the 



formulas of the oxides. 



{b) Mention two elements that occur in allotropic forms, and name several 

 allotropic forms in each case. 



(c) Mention three metals fusible below red heat, and three fusible only above 

 red heat. 



id) Mention three gases which are easily liquefied, and three which are 

 licjuefied with difficulty. 



{e) Name an acid all of whose normal salts are soluble in water. 



Group B 



8. (a) Apply Avogadro's law in finding the volume of carbon dioxide formed 



from the burning of 4 liters of carbon monoxide in oxygen, provided all 

 of the gases are measured at the same temperature and pressure. 

 {b) Name the components in a water solution of ammonia. 



9. (a) Write an equation illustrating a reaction between two salts in solution, 



which does not go to completion. Explain why this reaction does not 

 go to completion. 



{b) How does a water solution of copper sulphate react with Htmus? 

 Explain. 



Group C 



10. (a) Explain the use of cream of tartar in baking powders. 



(6) When a compressed mixture of air with gasoline is exploded in a confined 

 space, what substances may be formed? What difference in the 

 nature and relative amounts of the products may be expected (1) if 

 the amount of gasoline is small in comparison with the air present ? 

 (2) if the proportion of gasoline is unduly large ? 



11. (a) State what you would do in each of the following emergencies respectively: 



(1) Chlorine inhaled. 



(2) Acid in the eye. 



(3) Oil burning on the floor or desk. 



{b) Distinguish between destructive, fractional, and ordinary distillation by 

 giving a practical example of each. 



2>Z 



