nakuru district secondary schools trial examination - KCSE Online

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..................................................................................................................................................................................................................................................................................................................................................................................................................................................................(c) Name the nitrogenous compound formed when ammonia burns in oxygen in presence of aplatinum catalyst(1mark....................................................................................................................................................14 (a) State the type of bond in each of the following compounds (2marks)(i)(ii)(iii)Calcium fluoride (CaF 2 )..................................................................................( 1 / 2 mark)Methane (CH 4 )................................................................................................. 1 / 2 mark)Ammonium ion (NH + 4).....................................................................................(1mark)(b) Explain why the melting point of sodium is higher than that of potassium (1mark)..............................................................................................................................................................................................................................................................................................................................................................................................................................................................15 A polymeter has the following structure ;CH 2 – CH 2 – CH 2 –CH – CH- 2 CH– CH 2 – CH – CH 21 1 1 1Cl Cl Cl Cl nA sample of this polymer is found to have a molecular mass of 875.(a) Draw the structure of the monomer(1mark)..............................................................................................................................................................................................................................................................................................................................................................................................................................................................(b) Determine the number of monomers in the polymer (C=12, Cl=35.5)(2marks)...............................................................................................................................................................................................................................................................................................................................................................................................................................................................Visit:8www.kcse-online.info for thousands of free Past papers
16 Four metals F,G,H, and J were each separately added to cold water, hot water and steam.The table below is a summary of the observation made and the formulae of the hydroxideformed.Metals Cold water Hot water steam Formula ofhydroxideF Reacts slowly Reacts fast Reacts very fast Fe(OH) 2G No reaction No reaction No reaction -H Fast Reacts veryfastReacts explosivelyHOHJ No reaction Reacts slowly Reacts fast J(OH) 2(a)Which two elements are likely to be in the same group of the periodic table (1mark).......................................................................................................................................-.....................................................................................................................................(b) Arrange the metals in the order of their reactivity (2marks)............................................................................................................................................17 Study the standard electrode potentials for the half-cells given below and answer thequestions that follow. The letters do not represent the actual symbols of the elementE VoltsN + (aq) + e N (s) -2.92J + (aq) + e J (s) +0.52K + (aq) + e ½ K 2(g) 0.00½ G 2(g) + e G - (aq) 1.36M 2+ (aq) +2 e M(s) 0.44(a) Which is the strongest reducing agent? Give a reason for your answer(1mark)..............................................................................................................................................................................................................................................................................................................(b) Which two half cells would produce the highest potential difference when combined?(1mark)Visit:9www.kcse-online.info for thousands of free Past papers
Page 1 and 2: Name…………………………
Page 3 and 4: 3. Identify (3marks)a) solution K
Page 5 and 6: Timea) Which of the two R and P is
Page 7: ...................................
Page 11 and 12: ...................................
Page 13 and 14: Substance A........................

nakuru district secondary schools trial examination - KCSE Online

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