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CBSE Class 12 Board Exam 2019 : Chemistry (Series 2)

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SET-1 H$moS> Z . Series BVM/2 Code No. amob Z . 56/2/1 narjmWu H$moS >H$mo C ma-nwp VH$m Ho$ _wI-n >na Ad ` {bIo & Roll No. Candidates must write the Code on the title page of the answer-book. H $n`m Om M H$a b| {H$ Bg Z-n _o _w{ V n > 15 h & Z-n _| Xm{hZo hmW H$s Amoa {XE JE H$moS >Z ~a H$mo N>m C ma-nwp VH$m Ho$ _wI-n > na {bI| & H $n`m Om M H$a b| {H$ Bg Z-n _| >27 Z h & H $n`m Z H$m C ma {bIZm ew $ H$aZo go nhbo, Z H$m H $_m H$ Ad ` {bI| & Bg Z-n H$mo n T>Zo Ho$ {bE 15 {_ZQ >H$m g_` {X`m J`m h & Z-n H$m {dVaU nydm _| 10.15 ~Oo {H$`m OmEJm & 10.15 ~Oo go 10.30 ~Oo VH$ N>m Ho$db Z-n H$mo n T>|Jo Am a Bg Ad{Y Ho$ Xm amZ do C ma-nwp VH$m na H$moB C ma Zht {bI|Jo & Please check that this question paper contains 15 printed pages. Code number given on the right hand side of the question paper should be written on the title page of the answer-book by the candidate. Please check that this question paper contains 27 questions. Please write down the Serial Number of the question before attempting it. 15 minute time has been allotted to read this question paper. The question paper will be distributed at 10.15 a.m. From 10.15 a.m. to 10.30 a.m., the students will read the question paper only and will not write any answer on the answer-book during this period. agm`Z {dkmZ (g mp VH$) CHEMISTRY (Theory) {ZYm [aV g_` : 3 K Q>o A{YH$V_ A H$ : 70 Time allowed : 3 hours 56/2/1 Maximum Marks : 70 1 P.T.O. gm_m ` {ZX}e : (i) g^r Z A{Zdm` h & (ii) I S> A : Z g `m 1 go 5 VH$ A{V bKw-C mar` Z h Am a `oH$ Z Ho$ {bE 1 A H$ h & (iii) I S> ~ : Z g `m 6 go 12 VH$ bKw-C mar` Z h Am a `oH$ Z Ho$ {bE 2 A H$ h & (iv) I S> g : Z g `m 13 go 24 VH$ ^r bKw-C mar` Z h Am a `oH$ Z Ho$ {bE 3 A H$ h & (v) I S> X : Z g `m 25 go 27 VH$ XrK -C mar` Z h Am a `oH$ Z Ho$ {bE 5 A H$ h & (vi) Z n _| g_J {dH$ n Zht {X`m J`m h & {\$a ^r EH$ A H$ dmbo Xmo Zm| _|, Xmo A H$m| dmbo Xmo Zmo _|, VrZ A H$m| dmbo Mma Zm| _| VWm nm M A H$m| dmbo VrZm| Zm| _| {dH$ n {X`m J`m h & Eogo g^r Zm| _| go AmnH$mo EH$ hr {dH$ n H$m C ma XoZm h & (vii) `{X Amd `H$Vm hmo, Vmo Amn bKwJUH$s` gma{U`m _m J gH$Vo h & H $ Hw$boQ>am| Ho$ `moJ H$s AZw_{V Zht h & General Instructions : (i) All questions are compulsory. (ii) Section A : Questions number 1 to 5 are very short answer questions and carry 1 mark each. (iii) Section B : Questions number 6 to 12 are short answer questions and carry 2 marks each. (iv) Section C : Questions number 13 to 24 are also short answer questions and carry 3 marks each. (v) Section D : Questions number 25 to 27 are long answer questions and carry 5 marks each. (vi) There is no overall choice. However, an internal choice has been provided in two questions of one mark, two questions of two marks, four questions of three marks and all the three questions of five marks weightage. You have to attempt only one of the choices in such questions. (vii) Use of log tables, if necessary. Use of calculators is not allowed. I S> A SECTION A 1. KCl Am a AgCl _| go H$m Z em Q >H$s Xmof Xem Vm h Am a `m| AWdm Ja_ H$aZo na ZnO nrbm `m| VrV hmoVm h ? ? Out of KCl and AgCl, which one shows Schottky defect and why ? OR Why does ZnO appear yellow on heating ? 56/2/1 2 1 1 2. {Z Z{b{IV H$mo jmar` bjU Ho$ KQ>Vo h E H $_ _| `dp WV H$s{OE : 1 C6H5NH2, (CH3)3N, C2H5NH2 Arrange the following in decreasing order of basic character : C6H5NH2, (CH3)3N, C2H5NH2 3. {H$g H$ma H$m H$mobm BS> ~ZVm h O~ {H$gr R>mog H$mo d _| n[a{j V {H$`m OmVm h CXmhaU Xr{OE & ? EH$ 1 What type of colloid is formed when a solid is dispersed in a liquid ? Give an example. 4. 5. bmoamo~o OrZ Am a gmB bmohop gb bmoamBS> _| go H$m Z Zm{^H$ Zohr {V WmnZ A{^{H $`m Ho$ {V A{YH$ A{^{H $`merb h Am a `m| ? 1 Out of Chlorobenzene and Cyclohexyl chloride, which one is more reactive towards nucleophilic substitution reaction and why ? Q>mM Am a gobwbmog _| _yb^yV g aMZm _H$ A Va `m h ? 1 AWdm DNA Ho$ Ob-AnKQ>Z go m V C nmX {b{IE & 1 What is the basic structural difference between starch and cellulose ? OR Write the products obtained after hydrolysis of DNA. I S> ~ SECTION B 6. 2 {Z Z{b{IV H $_m| Ho$ {bE g Vw{bV amgm`{ZH$ g_rH$aU {b{IE : (a) ~wPo MyZo go Cl2 dm{hV H$s OmVr h & (b) Fe(III) bdU Ho$ Obr` {db`Z go SO2 J g dm{hV H$s OmVr h & AWdm (a) bmoarZ J g go ~ZmB JB Xmo {df br J gm| Ho$ Zm_ {b{IE & (b) A_mo{Z`m go A{^{H $`m H$aZo na Cu2+ {db`Z Zrbm a J `m| XoVm h ? 2 Write balanced chemical equations for the following processes : (a) Cl2 is passed through slaked lime. (b) SO2 gas is passed through an aqueous solution of Fe(III) salt. OR (a) (b) 56/2/1 Write two poisonous gases prepared from chlorine gas. Why does Cu2+ solution give blue colour on reaction with ammonia ? 3 P.T.O. 7. H$maU Xr{OE : (a) ImZm ~ZmZo Ho$ ~V Z H$s Anojm oea Hw$H$a _| ImZm A{YH$ erK Vm go nH$ OmVm h & (b) bmb {Ya H$mo{eH$mE (RBC) bdUr` Ob _| aIo OmZo na g Hw${MV hmo OmVr h na Vw AmgwV Ob _| \y$b OmVr h & 2 Give reasons : (a) Cooking is faster in pressure cooker than in cooking pan. (b) Red Blood Cells (RBC) shrink when placed in saline water but swell in distilled water. 8. A{^{H $`m H$s H$mo{Q> n[a^m{fV H$s{OE & {XE JE AmboIm| _| A{^{H $`m H$s H$mo{Q> H$s mJw{ $ H$s{OE : Ohm [R]o A{^H$_ H$ H$s map ^H$ gm Vm h Am a t1/2 AY Am`w h & Define order of reaction. Predict the order of reaction in the given graphs : where [R]o is the initial concentration of reactant and t1/2 is half-life. 56/2/1 4 2 9. O~ FeCr2O4 H$mo dm`w H$s Cnp W{V _| Na2CO3 Ho$ gmW g J{bV {H$`m OmVm h Vmo `m {JH$ (A) H$m nrbm {db`Z m hmoVm h & `m {JH$ (A) A brH$aU {H$E OmZo na `m {JH$ (B) XoVm h & `m {JH$ (B) KCl Ho$ gmW A{^{H $`m H$aHo$ EH$ Zma Jr a J H$m `m {JH$ (C) ~ZmVm h & `m {JH$ (C) H$m A br` {db`Z Na2SO3 H$mo (D) _| Am grH $V H$a XoVm h & (A), (B), (C) Am a (D) H$s nhMmZ H$s{OE & 2 When FeCr2O4 is fused with Na2CO3 in the presence of air it gives a yellow solution of compound (A). Compound (A) on acidification gives compound (B). Compound (B) on reaction with KCl forms an orange coloured compound (C). An acidified solution of compound (C) oxidises Na2SO3 to (D). Identify (A), (B), (C) and (D). 10. g Hw$b [Co(en)2(NO2)Cl]+ H$m IUPAC Zm_ {b{IE & Bg g Hw$b mam {H$g H$ma H$s g aMZm _H$ g_md`dVm Xem B OmVr h ? AWdm IUPAC _mZX S>m| H$m Cn`moJ H$aVo h E {Z Z{b{IV g Hw$bm| Ho$ gy {b{IE : (a) ho gmE dmH $mo{_`_(III) bmoamBS> (b) gmo{S>`_ Q >mBAm g boQ>mo\o$aoQ>(III) 2 2 Write IUPAC name of the complex [Co(en)2(NO2)Cl]+. What type of structural isomerism is shown by this complex ? OR Using IUPAC norms, write the formulae for the following complexes : (a) Hexaaquachromium(III) chloride (b) Sodium trioxalatoferrate(III) 11. (a) (b) (a) 56/2/1 ` {n [NiCl4]2 Am a [Ni(CO)4] XmoZm| _| sp3 g H$aU hmoVm h {\$a ^r [NiCl4]2 AZwMw ~H$s` h Am a [Ni(CO)4] {VMw ~H$s` h & H$maU Xr{OE & (Ni H$m na_mUw H $_m H$ = 28) {H $ Q>b jo {g m V Ho$ AmYma na d5 H$m Bbo Q >m {ZH$ {d `mg {b{IE O~{H$ (i) o < P Am a (ii) o > P 2 Although both [NiCl4]2 and [Ni(CO)4] have sp3 hybridisation yet [NiCl4]2 is paramagnetic and [Ni(CO)4] is diamagnetic. Give reason. (Atomic no. of Ni = 28) 5 P.T.O. (b) Write the electronic configuration of d5 on the basis of crystal field theory when (i) o < P and (ii) 12. o > P {Z Z{b{IV `oH$ A{^{H $`m _| _w ` `m {JH$m| A Am a B H$s g aMZmE {b{IE : 2 H / Pd BaSO PCl (a) 5 4 C6H5COOH B A 2 (b) CH3CN B A (ii) H3 O (i) CH3MgBr Zn(Hg ) / gm HCl Write structures of main compounds A and B in each of the following reactions : H / Pd BaSO PCl (a) 5 4 C6H5COOH B A 2 (b) A B CH3CN (ii) H3 O Zn(Hg ) / conc. HCl (i) CH3MgBr I S> g SECTION C 13. A{^{H $`m A + 2B C Ho$ {bE {Z Z{b{IV Am H$ S>o m h E : C Ho$ {daMZ H$m map ^H$ doJ `moJ [A]/M [B]/M 1 0 2 0 3 4 2 10 2 2 0 1 0 1 6 0 10 3 3 0 4 0 3 1 68 10 1 4 0 1 0 4 2 40 10 2 (a) A Am a B (b) doJ {Z`_ Am a A{^{H $`m H$s Hw$b H$mo{Q> {b{IE & (c) doJ p Wam H$ 56/2/1 Ho$ {V A{^{H $`m H$s H$mo{Q> kmV H$s{OE & (k) n[aH${bV H$s{OE & 6 /M min 1 3 The following data were obtained for the reaction : A + 2B C 14. Experiment [A]/M [B]/M Initial rate of formation of C /M min 1 1 0 2 0 3 4 2 10 2 2 0 1 0 1 6 0 10 3 3 0 4 0 3 1 68 10 1 4 0 1 0 4 2 40 10 2 (a) Find the order of reaction with respect to A and B. (b) Write the rate law and overall order of reaction. (c) Calculate the rate constant (k). (a) Yyb H$s n[a{j V md Wm Am a n[ajonU _m `_ {b{IE & (b) ^m {VH$ AdemofU C H $_Ur` O~{H$ agmoemofU AZw H $_Ur` `m| h (c) {M _| Xr JB {d{Y mam EH$ H$mobm BS>r gm b ~Zm`m J`m & naIZbr _| ~Zo H$mobm BS>r H$Um| Ho$ D$na `m Amdoe h ? `h gm b H $go {Z ${nV {H$`m OmVm h ? (a) Write the dispersed phase and dispersion medium of dust. (b) Why is physisorption irreversible ? 56/2/1 reversible 7 whereas chemisorption AgI ? 3 is P.T.O. (c) A colloidal sol is prepared by the method given in the figure. What is the charge on AgI colloidal particles formed in the test tube ? How is this sol represented ? 15. na_mUw `_mZ 81 u Ho$ {H$gr V d X H$m KZ d 10 2 g cm 3 h & `{X EH$H$ H$mop R>H$m H$m Am`VZ 2 7 10 23 cm3 h , Vmo KZr` EH$H$ H$mop R>H$m Ho$ H$ma H$s nhMmZ H$s{OE & ({X`m J`m h : NA = 6 022 1023 mol 1) 3 An element X with an atomic mass of 81 u has density 10 2 g cm 3. If the volume of unit cell is 2 7 10 23 cm3, identify the type of cubic unit cell. (Given : NA = 6 022 1023 mol 1) 16. 1 9 g 100 mL KCl (M = 74 5 g mol 1) H$m {db`Z 3 g {V 100 mL `y[a`m (M = 60 g mol 1) Ho$ gmW g_namgar h & KCl {db`Z H$s {d`moOZ H$s _m m n[aH${bV H$s{OE & _mZ br{OE {H$ XmoZm| {db`Z g_mZ Vmn na h & {V 3 A solution containing 1 9 g per 100 mL of KCl (M = 74 5 g mol 1) is isotonic with a solution containing 3 g per 100 mL of urea (M = 60 g mol 1). Calculate the degree of dissociation of KCl solution. Assume that both the solutions have same temperature. 17. (a) q OH$, (b) O_ o{Z`_, {g m V {b{IE & (c) Q>mBQ>o{Z`_ Ho$ {bE `w $ n[a H$aU {d{Y H$m Zm_ Am a 3 Write the name and principle of the method used for refining of (a) Zinc, (b) Germanium, (c) Titanium. 56/2/1 8 18. {Z Z{b{IV Ho$ {bE H$maU Xr{OE : (a) g H$aU YmVwE g Hw$b `m {JH$ ~ZmVr h & (b) (Zn2+/Zn) Am a (Mn2+/Mn) Ho$ {bE Eo Ho$ _mZ Ano{jV _mZm| go A{YH$ G$Um _H$ hmoVo h & (c) Eop Q>Zm `S> Am grH$aU Ad WmAm| H$m A{YH$ namg Xem Vo h & 3 Give reasons for the following : (a) (b) (c) 19. Transition metals form complex compounds. Eo values for (Zn2+/Zn) and (Mn2+/Mn) are more negative than expected. Actinoids show wide range of oxidation states. {Z Z{b{IV ~h bH$m| H$mo m V H$aZo Ho$ {bE `w $ EH$bH$m| H$s g aMZmE {b{IE : 3 (a) ZmBbm Z-6 (b) Q>oarbrZ (c) `yZm-N AWdm (a) `m [ CH2 CH(C6H5 ) ] n EH$ g_~h bH$ AWdm gh~h bH$ h ? H$maU Xr{OE & (b) {Z Z{b{IV ~h bH$ Ho$ EH$bH$ {b{IE : (c) EWrZ Ho$ ~h bH$Z _| ~o Om `b nam gmBS> H$s ^y{_H$m {b{IE & 3 Write the structures of monomers used for getting the following polymers : (a) Nylon-6 (b) Terylene (c) Buna-N OR (a) Is [ CH2 CH(C6 H5 ) ] n a homopolymer or copolymer ? Give reason. (b) Write the monomers of the following polymer : (c) Write the role of benzoyl peroxide in polymerisation of ethene. 56/2/1 9 P.T.O. 20. (a) {Z Z{b{IV _| go CZHo$ {M{H$ gr` JwUm| Ho$ AmYma na EH$ {df_ H$mo N>m {Q>E : B d {Zb, goH$moZb, ~mBWm`moZb, `y{_Zb (b) ~V Z YmoZo Ho$ Cn`moJ _| AmZo dmbo d An_mO H$ {H$g H$ma Ho$ An_mO H$ hmoVo h ? (c) Eo nmQ> o_ H$m Cn`moJ Ho$db R> S>o Im nXmWm o VH$ hr gr{_V `m| h ? AWdm `oH$ Ho$ {bE C{MV CXmhaU g{hV {Z Z{b{IV nXm| H$mo n[a^m{fV H$s{OE : (a) {VO {dH$ (Ep Q>~m`mo{Q>H$) (b) ny{VamoYr (Ep Q>gop Q>H$) (c) G$Um`Zr An_mO H$ (a) 3 3 Pick out the odd one from the following on the basis of their medicinal properties : Equanil, Seconal, Bithional, Luminal (b) What type of detergents are used in dishwashing liquids ? (c) Why is the use of aspartame limited to cold foods ? OR Define the following terms with a suitable example of each : 21. (a) Antibiotics (b) Antiseptics (c) Anionic detergents AUwgy C4H9Br (a) (b) (c) Ho$ g^r g_md`dm| _| go, nhMm{ZE EH$ g_md`d Omo Yw dU KyU H$ h & EH$ g_md`d Omo SN2 Ho$ {V A `{YH$ A{^{H $`merb h & Eogo Xmo g_md`d Omo Eo H$mohm br nmoQ> {e`_ hmBS >m gmBS> mam {dhmBS >moOZZ Ho$ \$b d $n EH$ O gm C nmX XoVo h & Among all the isomers of molecular formula C4H9Br, identify (a) the one isomer which is optically active. (b) the one isomer which is highly reactive towards SN2. (c) the two isomers which give same product on dehydrohalogenation with alcoholic KOH. 56/2/1 10 3 22. 3 {Z Z{b{IV A{^{H $`mAm| H$mo nyU H$s{OE : AWdm Amn {Z Z{b{IV $nm VaU H $go H$a oJo : (a) N-\o${ZbEWoZo_mBS> go p-~ mo_moEo{ZbrZ (b) ~o OrZ S>mBE Omo{Z`_ bmoamBS> go ZmBQ >mo~o OrZ (c) ~o OmoBH$ A b go Eo{ZbrZ 3 Complete the following reactions : OR How do you convert the following : (a) N-phenylethanamide to p-bromoaniline (b) Benzene diazonium chloride to nitrobenzene (c) Benzoic acid to aniline 56/2/1 11 P.T.O. 23. (a) (b) (a) H$maU Xr{OE : (i) Eogr{Q>H$ A b H$s Anojm ~o OmoBH$ A b ~bVa A b hmoVm h & (ii) EWoZob H$s Anojm _oW Zob Zm{^H$ Zohr `moJO A{^{H $`mAm| Ho$ {V A{YH$ A{^{H $`merb hmoVm h & monoZ b Am a monoZmoZ Ho$ ~rM {d^oX H$aZo Ho$ {bE EH$ gab amgm`{ZH$ narjU Xr{OE & Give reasons : (i) (ii) (b) 24. 3 Benzoic acid is a stronger acid than acetic acid. Methanal is more reactive towards nucleophilic addition reaction than ethanal. Give a simple chemical test to distinguish between propanal and propanone. (a) _m Q>mog Ho$ Ob-AnKQ>Z Ho$ C nmX `m h ? (b) moQ>rZ H$s -ho{b g g aMZm H$mo {H$g H$ma H$m Am~ YZ Wm{` d XmZ H$aVm h ? (c) Cg {dQ>m{_Z H$m Zm_ {b{IE {OgH$s H$_r go Umer a $m nVm hmo OmVr h & AWdm {Z Z{b{IV nXm| H$mo n[a^m{fV H$s{OE : (a) Vrn eH $am (b) mH $V moQ>rZ (c) `yp bAmoQ>mBS> (a) What are the products of hydrolysis of maltose ? (b) What type of bonding provides stability to -helix structure of protein ? (c) Name the vitamin whose deficiency causes pernicious anaemia. OR Define the following terms : (a) Invert sugar (b) Native protein (c) Nucleotide 56/2/1 12 3 3 I S> X SECTION D 25. (a) (b) 0 001 mol L 1 Eogr{Q>H$ A b H$s MmbH$Vm 4 95 10 5 S cm 1 h & `{X Eogr{Q>H$ A b Ho$ {bE om H$m _mZ 390 5 S cm2 mol 1 h , Vmo BgHo$ {d`moOZ p Wam H$ H$m n[aH$bZ H$s{OE & A{^{H $`m 2 Al (s) + 3 Cu2+ (aq) 2 Al3+ (aq) + 3 Cu (s) (c) (a) Ho$ {bE 25 C na Zo Q> g_rH$aU {b{IE & g Mm`H$ ~ Q>[a`m `m h ? EH$ CXmhaU Xr{OE & AWdm Cg gob H$mo {Z ${nV H$s{OE {Og_| {Z Z{b{IV A{^{H $`m hmoVr h : 5 2 Al (s) + 3 Ni2+ (0 1 M) 2 Al3+ (0 01 M) + 3 Ni (s) BgH$m {d.dm.~b (b) (emf) n[aH${bV H$s{OE `{X E o gob = 1 41 V h & ~b Am a X ~ b {d wV -AnKQ> Ho$ {bE gm Vm ~ T>Zo Ho$ gmW _moba MmbH$Vm {H$g H$ma n[ad{V V hmoVr h ? Amn X ~ b {d wV -AnKQ> Ho$ {bE gr_m V _moba MmbH$Vm ( om ) H $go m H$a gH$Vo h ? (a) The conductivity of 0 001 mol L 1 acetic acid is 4 95 10 5 S cm 1. o Calculate the dissociation constant if m for acetic acid is 390 5 S cm2 mol 1. (b) Write Nernst equation for the reaction at 25 C : 5 2 Al (s) + 3 Cu2+ (aq) 2 Al3+ (aq) + 3 Cu (s) (c) What are secondary batteries ? Give an example. OR (a) Represent the cell in which the following reaction takes place : 2 Al (s) + 3 Ni2+ (0 1 M) 2 Al3+ (0 01 M) + 3 Ni (s) Calculate its emf if E ocell = 1 41 V. (b) 56/2/1 How does molar conductivity vary with increase in concentration for strong electrolyte and weak electrolyte ? How can you obtain o limiting molar conductivity ( m ) for weak electrolyte ? 13 P.T.O. 26. (a) (b) (c) (a) (b) (c) (a) {Z Z{b{IV A{^{H $`mAm| Ho$ {bE g_rH$aU Xr{OE : (i) \$sZm b H$s gm HNO3 Ho$ gmW A{^{H $`m H$s OmVr h & (ii) monrZ H$s B2H6 go A{^{H $`m H$aHo$ H2O2/OH go A{^{H $`m H$s OmVr h & (iii) gmo{S>`_ V Vr`H$- `yQ>m gmBS> H$s CH3Cl Ho$ gmW A{^{H $`m H$s OmVr h & `yQ>oZ-1-Am b Am a `yQ>oZ-2-Am b Ho$ ~rM Amn H $go {d^oX H$a|Jo ? {Z Z{b{IV H$mo A br`Vm Ho$ ~ T>Vo h E H $_ _| `dp WV H$s{OE : \$sZm b, EWoZm b, Ob AWdm (i) `y_rZ, (ii) ~o OrZ g \$mo{ZH$ A b, (iii) ~o OrZ S>mBE Omo{Z`_ bmoamBS> go Amn \$sZm b H $go m H$a gH$Vo h ? 3-_o{Wb \$sZm b Ho$ { ZmBQ >moH$aU go m _w ` C nmX H$s g aMZm {b{IE & H$mo ~o A{^{H $`m go g ~ A{^{H $`m {b{IE & Give equations of the following reactions : (i) (ii) Phenol is treated with conc. HNO3. Propene is treated with B2H6 followed by H2O2/OH . (iii) Sodium t-butoxide is treated with CH3Cl. (b) How will you distinguish between butan-1-ol and butan-2-ol ? (c) Arrange the following in increasing order of acidity : Phenol, ethanol, water OR (a) (b) (c) 27. (a) 56/2/1 How can you obtain Phenol from (i) Cumene, (ii) Benzene sulphonic acid, (iii) Benzene diazonium chloride ? Write the structure of the major product obtained from dinitration of 3-methylphenol. Write the reaction involved in Kolbe s reaction. {Z Z{b{IV Ho$ H$maU Xr{OE : (i) dJ 15 _| N go Bi VH$ 3 Am grH$aU Ad Wm Xem Zo H$s d { m KQ>Vr h & (ii) H2O go H2Te VH$ A br` bjU ~ T>Vm h & (iii) ClF3 H$s Anojm F2 A{YH$ A{^{H $`merb h , O~{H$ Cl2 H$s Anojm ClF3 A{YH$ A{^{H $`merb h & 14 5 5 (b) (a) (b) (c) (d) (e) (a) (b) (i) XeF2, (ii) H4P2O7 H$s g aMZm It{ME & AWdm bwAmoarZ H$s Agm_m ` A{^{H $`m Xem Zo Ho$ {bE EH$ CXmhaU Xr{OE & doV \$m \$moag Am a bmb \$m \$moag Ho$ ~rM EH$ g aMZm _H$ A Va `m h ? `m hmoVm h O~ XeF6, NaF go A{^{H $`m H$aVm h ? H2O H$s Anojm H2S EH$ ~ohVa AnMm`H$ `m| h ? {Z Z{b{IV A bm| H$mo CZHo$ A br` bjU Ho$ ~ T>Vo h E H $_ _| `dp WV H$s{OE : HF, HCl, HBr Am a HI 5 5 Account for the following : (i) Tendency to show 3 oxidation state decreases from N to Bi in group 15. (ii) Acidic character increases from H2O to H2Te. (iii) F2 is more reactive than ClF3, whereas ClF3 is more reactive than Cl2. Draw the structure of (i) XeF2, (ii) H4P2O7. OR (a) Give one example to show the anomalous reaction of fluorine. (b) What is the structural difference between white phosphorus and red phosphorus ? (c) What happens when XeF6 reacts with NaF ? (d) Why is H2S a better reducing agent than H2O ? (e) Arrange the following acids in the increasing order of their acidic character : HF, HCl, HBr and HI 56/2/1 15 P.T.O.

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