Set 6 Chemistry [Paper] 1

1 SECTION A -46 MARKS Attempt all questions in this section. 1. The elements tin and lead belong to group (IV) of the periodic table. a) Write equation for the preparation of the tetra chlorides of the elements: (@01 mark)  Tin ………………………………………………………………………………………………… …………………………………………………………………………………………………  Lead ………………………………………………………………………………………………… ………………………………………………………………………………………………… b) Tin (IV) chloride fumes in moist air . Explain this observation . (03 marks) ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… 2.a) Complete the following nuclear reactions . i. 𝐵𝑒49 + γ 𝐵𝑒48 + …………………… (01 mark) ii. 𝐹919 + 𝑛01 ……………….. + 𝐻𝑒24 (01 mark) b) It takes 5 days for 0.025mg of bismuth -214 to disintegrate in to 0.0125mg of bismuth -210 .Calculate the time required for 0.016mg bismuth -214 to change in to 0.001mg bismuth -210 . (03 marks) ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ……………………………………………………………………… ………………………………… ………………………………………………………………………………………………………… 3.a) At 25C, 0.1M solution of ethylamine is 7.3% ionized. Write an equation for the ionization of ethylamine in water. (01 mark) ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… 2 b) Calculate the concentration of hydroxide ions at equilibrium. (01 mark) ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… c) 1.0 x 10-2mol of ethylamine hydrochloride was added to 1dm3 of ethylamine solution in (a).Calculate the hydroxide ion concentration of the resultant solution. State any assumption made. (04 marks) ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ………………………………………………………………………………… …………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………… …………………………………………………………………………………………… ………………… ……………………………………………………………………………………………………………… ……………………………………………………………………………………………………………... 4.a) Draw a structure and name the shape of the following s anion . (03 marks) SO32- SO42- S2O32-Anions Shapes Names 3 b) Name a reagent (s) which can be used to distinguish between SO 32- and SO 42- ions, State what would be observed . Regent (s): (01 mark) ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… Observation(s): (01 mark) ……………………………………………………… ………………………………………………… ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… 5. (a). (i). State the condition (s) under which chlorine gas reacts with sulphur dioxide gas. (01 mark) ………………………………………………………………………………………………………… ………………………………………………………………………………………………………… (ii).Write equation …