Cambridge AssessmentInternational EducationCambridge International AS A LevelCANDIDATENAMECENTRECANDIDATENUMBERNUMBERCHEMISTRY9701/42Paper 4 A Level Structured QuestionsFebruary/March 20232 hoursYou must answer on the question paper.No additional materials are needed.INSTRUCTIONS.Answer all questions.Use a black or dark blue pen.You may use an HB pencil for any diagrams or graphs.Write your name,centre number and candidate number in the boxes at the top of the page.Write your answer to each question in the space provided.Do not use an erasable pen or correction fluid.Do not write on any bar codes.You may use a calculator.You should show all your working and use appropriate units.INFORMATION.The total mark for this paper is 100.The number of marks for each question or part question is shown in brackets ]The Periodic Table is printed in the question paper.Important values,constants and standards are printed in the question paper.This document has 28 pages.Any blank pages are indicated.DC(CE/SG)311729/4©UCLES2023[Turn over21 (a)The most common zinc mineral contains zinc(II)sulfide,ZnS.(i)Complete the electrons in boxes diagram in Fig.1.1 to show the electronic configurationof a zinc(II)ion.3d4p[Ar]Fig.1.1(ii)Complete Fig.1.2 to show the Born-Haber diagram for the ionic solid ZnS.Include state symbols of relevant species.Zn2+(g)+S(g)+2eEA2IE2EA1Zn2*(g)+S-(g)+e-IE1△HatZnS(s)Fig.1.2[3]©UCLES20239701/42/F/M233(iii)Describe the trend in the first electron affinity of the Group 16 elements S to Te.Explain your answer.(iv)Explain why the lattice energy,AHatt.of ZnO is more exothermic than that of ZnS.[2(b)Zinc metal can be obtained in a two-step process as shown.step 1 2ZnS(s)+30,(g)>2ZnO(s)+2S0,(g)step 2 ZnO(s)+C(s)>Zn(I)+CO(g)The reactions are camied out at 800C.(i)Predict the sign of the entropy change,As,of the reaction in step 1.Explain your answer.(ii)Use the data in Table 1.1 to calculate AS of the reaction shown in step 2.Table 1.1chemicalZno(s)C(s)cO(g)S/JK-1mol-143.75.750.8197.7©UCLES20239701/42/F/M23