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93 dse2001abciii l l the table below shows some

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93
DSE20_01abciiiLl.The table below shows s:ome infonn11tii:in of elements Y and z,Atomic numberNumber of.occupied electron shells in the atomsNumber of electrons in the outermost shellin the atoms(a}Siatc the electronic arratlgcment of an atom ofY,y3547z53s7(1 mark)(h)Draw the electron diagram for a molecule of Z, showing ELECTRONS IN THE OUTERMOSTSHELLS only.(c)An experiment forY and Z is perfonned as shown in the set-up below. Dilute hydrochloric aci.dis added to the KzSO3cr)'Stals, tben the whole set-up is covered with·a lid.Container ( l) :aqueous solution ofY(reddish brown)K:S0J crystalsrr.i.nsparent bo.,;;Container (2):aqueous solution ofZ(pale brown)(c)(i)l<.1S� crystals react with dilute hydrochloric acid to give sulphur dioride gas.Write achemical equation for the :reaction, showing alt state symbols.(ii)State the expected observation in Container (1} and vmte an ionic equation for thereaction involved.(iii)It-is expectM that. the observation in Container (2) is similar to that in Container (1).Suggest a reason for this expectation based on electronic arrangementDSE20_03bi,iii(b)H3NBH1has a structure sirru.1ar ui that of ethane. Its electron diag.ramisshown below (sh0awingelectronsin:the·outermost shells only).(i)Which of the H�B, B-N and N-Hbonds would be dative covalent bond(s)? Explainyour answer.(iii)Under suitable conditions, H,NBH, con decompose into boron nitride and hydrogen. Thestrut:lure of Solid boron nitrideissirrular to that of graphite.Draw the structure of ONELA YER of solid boron nitride (Note : B and N-are in alternate positions).Marking SchemeMCQCB90_02DCB90_03CE90_26CCE9l_0lCE92_03CCE92_04CE93_01DCE93_02CE.94_-02BCE94_03CE95_01ACE95_02CB95_06ACE95_26CB96_01CCE96_02CB96_44CCE96_45CE97_02BCE97_03CE98_01DCE98_18CB99_0SDCE99_01CE99_34DCE99_39CE00_07CCE00_09CE00_39DcE00_42CE-01_07ACE0I_l8CE.01_42ACE01_49CE02_36DCE-02_46CE0:l_l2B(8&%)CE03..JSCE05SP_16DCE05SP_3lCE04_t0B(-47%)CE-04_23CE05_03B (67¾)CE0S_-06CE0S_13D(70%)CE-05_27CE06_04B(72%)CE-06_0SCE06_24D{S4%)CE07_03CE07_1SB (64¾)CE07_28CE0S_02D(76%)CE0&_ISCBQ9_01C(7I%)CE09_07CE09_220(17%)CE09_2&CEI0_l7B(83%}CEli_0tCE11_31D(S8%)ALI0(l)_-03DSB11SP_22 DDSE11SP_24DSE12PP _03 ADSB\2PP_04DSB12_01D(71%)OSE12_08DSB13_02C(92%)DSE13_04DSBt4_02D(75%)DSEIS_0lDSE16_02C(S8%)DSE17_01DSBl8_05C(S-0%)DSE19_01DSE20_2DDSE20_3C_04A_25DBCB91_02ACE92_02DACB92_30ACB92_45CBCE93_23DCE94_01CACE94_:36ACE94_46BDCE9S_03ACE9S_04CBCE95_34ACB95_39ABCB96_03ACE96_39ABCE96_50CCE9'1_01DDCE97_05BCE97_30CBCE98...)3BCE98_45ABCE99_11ACE99_19BCCE99_46ACEO0_0lBDCE00_17BCE00_34DDCE00_46CCE-01_01DBCE0l_20BCE0!_37DDCE02_0lCCE02_28AACE02_49ACE03_01C(64%)D(S7%)CE03_46B (59%)CE0SSP_-03B (67%)A(60%)CE04_01C(67%)CE04_02D(S4¾}C(84%)CE04_30A(45%)CE04_310(64¾)D(76%)CE05_07C(67%)CE0S_09B (53%)B (66%)CE06_01O(6S"/o)CE06_02D{S3%)8(59¾}CE06_06C(79%)CB06_14B (87%)D(52%)CE07_12D(SO¾)CE07_l3A(66¾)C(31%)CE07_29C(82%)CE-07_43A(24%)D(49%)CB08_19B (43%)CE0&_46B(63%)D(63%)CE09_18A(79%)CE09_l9C(12¾)B(48%)CEl0_0IA (S3%}CE.10_13D (S:lo/o)D(92%)CE11_02B(S5%)CE11_03C(l6%)DDSEIISJ>_07ADSBHSP_11CCDSEllSP_36CDSBl2PP_0lBDDSE12PP_lSDDSEl2PP_l8AC(94%)DSEl2_1SD(63%)DSBB_0IC{70%)B(62%)

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