Set 10 Chemistry [Paper] 2

1 SECTION A (60 Marks) Answer only three questions from this section . 1.(a) (i).Distinguish between d - block element and transition element. (02 marks) (ii).Explain why zinc is not considered as a typical transition element. (02 marks) b) One of the characteristics of transition elements is complex ion formation . (i) What is meant by the term complex ion? (01 mark) (ii) State three factors that favour formation of complexes. (01½ marks) c) Chromium (III) chloride hexahydrate , CrCl 3.6H 2O exists in isomeric forms . Write the possible isomers of the compound . (02 marks) d) A mixture of manganese (IV) oxide and potassium hydroxide was fused in the presence of excess air. (i) State what was observed . (01 mark) (ii) Write equation for th e reaction that took place. (01½ marks) e) The product in (d) was dissolved in water and the resultant solution acidified with dilute sulphuric acid. (i) State what was observed. (01½ marks) (ii) Explain your observation (02½ marks) f) Name the reagent that cab used to distinguish betwee n the following pairs of Ions and State what would be observed when each ion of the pair is treated with the reagent. (i) Fe2+ and Sn2+ (02½ marks) (ii) Co2+ and Cu2+ (02½ marks) 2 2. 1 mole of an organic compound Q , 𝐶𝑥𝐻𝑦𝑂𝑧 reacts completely with 7 moles of oxygen to form 6 moles of carbon dioxide and 3 moles of water. a) Determine the molecular formula of Q. (03½ marks) b) Organic compound, Q burns with a sooty flame. Identify Q. (0½ mark) c) Write equation and suggest a mechanism for the reaction between an alkaline solution of Q and: (i) Bromoethane . (03 marks) (ii) Propanoyl chloride [CH3CH2COCl] (04 marks) d) State what would be observed, write equation for …