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CIE Jun 2016 v1 Paper 2 Q2
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![PMT D, E, F, and G are four consecutive elements in the fourth period of the Periodic Table. (The letters are not the actual symbols of the elements.) D is a soft, silvery metal with a melting point just above room temperature. Its amphoteric oxide, D2O3, has a melting point of 1900 C and can be formed by heating D in oxygen. G is a solid that can exist as several different allotropes, most of which contain G8 molecules. G burns in air to form GO2 which dissolves in water to form an acidic solution. This solution reacts with sodium hydroxide to form the salt Na2GO3. (a) Suggest the identities of D and G. DG[1] (b) Write equations for the reactions of D2O3 with (i) hydrochloric acid,[2] (ii) sodium hydroxide.[2] (c) Suggest the type of bonding and structure in D2O3.[1] (d) Write an equation for the formation of an acidic solution when GO2 dissolves in water.[1] [Total: 7]UCLES 2016 9701/21/M/J/16 [Turn over<br />](https://learnah.org/wp-content/uploads/2018/08/June_2016_v1_QP_-_Paper_2_CIE_Chemistry_A-level_2.jpg)
![Page 3 Mark Scheme Syllabus Paper Cambridge International AS/A LevelMay/June 2016 9701 21 Mark Scheme Mark Total PMT Question (ii) +++ 0.56) (86 9.86) (87 7.00) (88 82.58) 87.71 100 A = 84 (a) D = Ga G = Se (b) (i) D2O3 + 6HCl2DCl 3 + 3H2O M1 = species; M2 = balancing (ii) D2O3 + 2NaOH + 7H2O2NaD(OH)4(H2O)2 OR D2O3 + 2NaOH + 3H2O2NaD(OH)4 OR D2O3 + 2NaOH2NaDO2 + H2O OR D2O3 + 2OH + 7H2O2[D(OH)4(H2O)2] OR D2O3 + 2OH + 3H2O2[D(OH)4] OR D2O3 + 2OH2DO2 + H2O M1 = species; M2 = balancing (c) giant ionic / ionic lattice (d) GO2 + H2OH2GO3Cambridge International Examinations 2016 [1] [1] [2] [16] [1] [1] [1] [1] [2] [2] [1] [1] [1] [1] [1] [1] [7]<br />](https://learnah.org/wp-content/uploads/2018/08/June_2016_v1_MS_-_Paper_2_CIE_Chemistry_A-level_2.jpg)