CIE Nov 2013 v3 Paper 4 Q4

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Examiners For Use (a) The electrical conductivities of some Group IV elements are given below. element electrical conductivity / 1 cm1 C (graphite) Si Ge Sn 6.1102 2.5106 1.5102 9.2104 From a consideration of the structures, suggest reasons for the following. (i) The electrical conductivity of silicon is less than that of graphite.(ii) The electrical conductivity of tin is more than that of germanium.[2] (b) Using data from the Data Booklet where appropriate, write equations for the following reactions of compounds of Group IV elements. (i) the action of heat on PbO2(s)(ii) PbO2(s) + HCl (aq)(iii) SnO(s) + NaOH(aq)(iv) GeCl 4(l) + H2O(l)[4] [Total: 6]UCLES 2013 9701/43/O/N/13 [Turn over<br />

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