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CBSE Class XII 2014 : CHEMISTRY

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H$moS> Z . Series OSR/2 Code No. amob Z . 56/2/1 narjmWu H$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 _| >30 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 30 questions. Please write down the Serial Number of the question before attempting it. 15 minutes 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) Z-g `m 1 go 8 VH$ A{V bKw-C mar` Z h & `oH$ Z Ho$ {bE 1 A H$ h & (iii) Z-g `m 9 go 18 VH$ bKw-C mar` Z h & `oH$ Z Ho$ {bE 2 A H$ h & (iv) Z-g `m 19 go 27 VH$ ^r bKw-C mar` Z h & `oH$ Z Ho$ {bE 3 A H$ h & (v) Z-g `m 28 go 30 VH$ XrK -C mar` Z h & `oH$ Z Ho$ {bE 5 A H$ h & (vi) Amd `H$VmZwgma bm J Q>o~bm| H$m `moJ H$a| & H $ Hw$boQ>am| Ho$ Cn`moJ H$s AZw_{V Zht h & General Instructions : (i) All questions are compulsory. (ii) Questions number 1 to 8 are very short-answer questions and carry 1 mark each. (iii) Questions number 9 to 18 are short-answer questions and carry 2 marks each. (iv) Questions number 19 to 27 are also short-answer questions and carry 3 marks each. (v) Questions number 28 to 30 are long-answer questions and carry 5 marks each. (vi) Use Log Tables, if necessary. Use of calculators is not allowed. 1. \o$Z bdZ {d{Y _| A` H$m| H$mo gm{ V H$aZo _| g J mhH$m| h ? (collectors) H$m `m H$m` hmoVm 1 What is the function of collectors in the froth floatation process for the concentration of ores ? 2. ^m {VH$ A{YemofU hmoZo _| {H$g H$ma Ho$ ~b C maXm`r hmoVo h ? What type of forces are responsible for the occurrence of physisorption ? 56/2/1 2 1 3. EH$b N N Am~ Y EH$b P P ? Am~ Y go X ~ b `m| hmoVm h 1 Why is the single N N bond weaker than the single P P bond ? 4. {Z Z{b{IV g H$a {H$g H$ma H$s g_md`dVm (isomerism) X{e V H$aVm h : 1 [Co(NH3)6][Cr(CN)6] What type of isomerism is shown by the following complex : [Co(NH3)6][Cr(CN)6] 5. b.c.c. EoH$H$ gob _| na_mUw { `m g ~ Y H$mo ` $ H$s{OE & (r) Am a gob Ho$ {H$Zmao H$s b ~mB (a) Ho$ Amngr 1 Express the relationship between atomic radius (r) and the edge length (a) in the b.c.c. unit cell. 6. {Z Z{b{IV `m {JH$ H$m AmB .`y.nr.E.gr. (IUPAC) Zm_ {b{IE : 1 Write the IUPAC name of the following compound : 7. BZ XmoZm| _| go H$m Z-gm A{YH$ jmar` h Am a `m| ? 1 Which of the two is more basic and why ? 8. Q>mM ~ZmZo dmbo - byH$mo O Ho$ Xmo KQ>H$m| Ho$ Zm_ {b{IE & 1 Name the two components of -glucose which constitute starch. 56/2/1 3 P.T.O. 9. Ho$ EH$ {db`Z H$m b {Q>Z_ Ho$ Bbo Q >moS>m| Ho$ ~rM 5.0 Eo nr`a {d wV Ymam go 20 {_ZQ> VH$ d wV AnKQ>Z {H$`m J`m & H $WmoS> na {ZH $b H$m {H$VZm `_mZ {Zjo{nV hmoJm ? Ni(NO3)2 2 ({X`m J`m h : {ZH $b H$m na_mUw `_mZ = 58.7 g mol 1, 1 F = 96500 C mol 1) A solution of Ni(NO3)2 is electrolysed between platinum electrodes using a current of 5.0 ampere for 20 minutes. What mass of nickel will be deposited at the cathode ? (Given : At. Mass of Ni = 58.7 g mol 1, 1 F = 96500 C mol 1) 10. A{^{H $`m H$s AY Am`w H$s n[a^mfm {b{IE & {Z Z Ho$ AY Am`w Ho$ {b`o ` OH$ {b{IE : (i) ey ` H$mo{Q> H$s A{^{H $`m (ii) 2 W_ H$mo{Q> H$s A{^{H $`m Define half-life of a reaction. Write the expression of half-life for (i) (ii) 11. zero order reaction and first order reaction. {g da A` H$ go {g da Ho$ {Z H$f U go g ~ amgm`{ZH$ A{^{H $`mE {b{IE & 2 Write the chemical reactions involved in the extraction of silver from silver ore. 12. g \$a Ho$ Xmo A{V _h dnyU Ana $nm| Ho$ Zm_ {b{IE & BZ XmoZm| _| go H$m Z-gm H$j Vmn na Wm`r hmoVm h ? `m hmoVm h O~ Wm`r $n H$mo 370 K go D$na Ja_ {H$`m OmVm h ? 2 AWdm (i) (ii) 56/2/1 g nH $ {d{Y go H2SO4 H$s m{ H$mo A{YH$V_ ~ZmZo Ho$ {V~ Y {b{IE & Ob _ o H2SO4 Ho$ {bE Ka2 << Ka1 `m| h 4 ? 2 Name the two most important allotropes of sulphur. Which one of the two is stable at room temperature ? What happens when the stable form is heated above 370 K ? OR (i) (ii) 13. Write the conditions to maximize the yield of H2SO4 by contact process. Why is Ka << Ka for H2SO4 in water ? 2 1 {Z Z g_rH$aUm| H$mo nyam H$s{OE MnO 4 (i) 2 (ii) Cr2O7 2 : 2 + 5 S2 + 16 H+ + 2 OH Complete the following equations : (i) (ii) 14. 2 MnO 4 + 5 S2 + 16 H+ Cr2O7 2 + 2 OH g H$a [CoF6]3 Ho$ {b`o g H$aU Ad Wm, AmH ${V Am a (Co H$m na_mUw H $_m H$ = 27) IUPAC Zm_ 2 {b{IE & Write the state of hybridization, shape and IUPAC name of the complex [CoF6]3 . (Atomic no. of Co = 27) 15. {Z Z Ho$ {bE amgm`{ZH$ g_rH$aU {b{IE : (i) O~ E{Wb bmoamBS> H$s Obr` (ii) O~ {ZO b OmVr h & AlCl3 2 KOH go A{^{H $`m H$s OmVr h & H$s Cnp W{V _| bmoamo~o OrZ H$s CH3COCl go A{^{H $`m H$s Write chemical equations when (i) (ii) 56/2/1 ethyl chloride is treated with aqueous KOH. chlorobenzene is treated with CH3COCl in presence of anhydrous AlCl3. 5 P.T.O. 16. (a) {Z Z `w _m| go {H$g Eop H$b hobmBS> H$s Amn SN2 {H $`m{d{Y mam A{YH$ Vrd Vm go A{^{H $`m H$aZo H$s Amem H$a|Jo Am a `m| ? CH3 CH2 CH CH3 Br CH3 CH2 CH2 CH2 Br (b) SN1 A{^{H $`mAm| (a) Which alkyl halide from the following pairs would you expect to react more rapidly by an SN2 mechanism and why ? (b) 17. _| ao{g_rH$aU hmo OmVm h & `m| ? 2 CH3 CH2 CH CH3 CH3 CH2 CH2 CH2 Br Br Racemisation occurs in SN1 reactions. Why ? {Z Z A{^{H $`m H$s {H $`m{d{Y {b{IE : 2 HBr CH3CH2OH CH3CH2Br H2O Write the mechanism of the following reaction : HBr CH3CH2OH CH3CH2Br H2O 18. {Z Z A{^{H $`mAm| _| `w $ A{^H$maH$m| Ho$ Zm_ {b{IE : (i) \$sZm b Ho$ ~ mo_rZoeZ go 2,4,6-Q >mB ~ mo_mo \$sZm b ~ZmZm (ii) `yQ>oZ-2-AmoZ go `yQ>oZ-2-Amob ~ZmZm (iii) Eo{Zgmob H$m \ $sS>ob H $m Q >g Eop H$brH$aU (iv) mW{_H$ Eo H$mohm b Ho$ Am grH$aU mam H$m~m op g{bH$ A b ~ZmZm Name the reagents used in the following reactions : (i) (ii) Butan-2-one to Butan-2-ol (iii) Friedel Crafts alkylation of anisole (iv) 56/2/1 Bromination of phenol to 2,4,6-tribromophenol Oxidation of primary alcohol to carboxylic acid 6 2 19. (i) KCl {H$g (ii) {g{bH$m Z H$mo (iii) {Z Z _| go H$m Z-gm Amp dH$ R>mog H$m CXmhaU h CO2 AWdm SiO2 (iv) BZ_| go H$m Z-gm A{YH$ A N>o Mw ~H$ ~ZmEJm, \o$amoMw ~H$s` nXmW AWdm \o$arMw ~H$s` nXmW ? H$ma H$m agg_rH$aU{_Vr` Xmof {XImVm h Am a `m| As go ? S>mo{nV H$aZo na {H$g H$ma H$m AY MmbH$ ~ZVm h ? : (i) What type of stoichiometric defect is shown by KCl and why ? (ii) What type of semiconductor is formed when silicon is doped with As ? (iii) 3 Which one of the following is an example of molecular solid : CO2 or SiO2 (iv) (i) gmYmaU gob H$s VwbZm _| (ii) 20. What type of substances would ferromagnetic or ferrimagnetic ? ZrMo Xr JB gob A{^{H $`m Ho$ {b`o gm ` p Wam H$ H2 O2 make better magnets, B YZ gob Ho$ Xmo bm^ {b{IE & (Kc) 10 h & BgHo$ {b`o n[aH${bV H$s{OE & E o gob 3 (i) Write two advantages of H2 O2 fuel cell over ordinary cell. (ii) Equilibrium constant (Kc) for the given cell reaction is 10. o Calculate Ecell . 56/2/1 7 P.T.O. 21. p Wa Am`VZ Ad Wm _| h E Wo : SO2Cl2 Ho$ W_ H$mo{Q> Ho$ D$ _r` AnKQ>Z _| {Z Z Am H$ S>o m SO2Cl2 (g) SO2 (g) Cl2(g) g_`/s 1 gH$b Xm~/atm `moJ 1 0 0 .4 2 100 0 .7 doJ p Wam H$ n[aH${bV H$s{OE & ({X`m J`m h : log 4 = 0.6021, log 2 = 0.3010) 3 The following data were obtained during the first order thermal decomposition of SO2Cl2 at a constant volume : SO2Cl2 (g) SO2 (g) Cl2(g) Experiment Time/s 1 Total pressure/atm 1 0 0 .4 2 100 0 .7 Calculate the rate constant. (Given : log 4 = 0.6021, log 2 = 0.3010) 22. (a) (b) (c) R>mogm| na J gm| Ho$ A{YemofU Ho$ {bE \ $m ` S>{bH$ A{YemofU g_Vmnr (isotherm) Ho$ {bE EH$ g_rH$aU Ho$ $n _| ` OH$ {b{IE & _ IZ Ho$ n[a{j md Wm Am a n[ajon _m `_ `m h ? g_w Am a ZXr Ho$ {_bZo Ho$ WmZ na S>o Q>m ~ZVm h & `m| ? (a) (b) What are the dispersed phase and dispersion medium of butter ? (c) 56/2/1 Write the expression for the Freundlich adsorption isotherm for the adsorption of gases on solids, in the form of an equation. A delta is formed at the meeting place of sea and river water. Why ? 8 3 23. (a) b WoZm `S> H$m Z-H$m Z gr {d{^ CnMm`r Ad WmE {XImVo h (b) g H $_U V dm| H$s Xmo {deofVmE {b{IE & (c) 3d- bm H$ `m| ? ? Ho$ V dm| _| go {H$Z-{H$Z H$mo g H $_U V d Zht _mZm Om gH$Vm h Am a 3 AWdm {Z Z Ho$ {bE Cn`w $ H$maU {b{IE : +3 Am grH$aU Ad Wm H$mo m H$aZo Ho$ {bE 2+ Mn `m {JH$ A{YH$ Wm`r hmoVo h & Fe2+ (a) AnZr (b) Sc (Z = 21) (c) Obr` {db`Z _|o (a) What are the different oxidation states exhibited by the lanthanoids ? (b) Write two characteristics of the transition elements. (c) Which of the 3d-block elements may not be regarded as the transition elements and why ? go Zn (Z = 30) VH$ Ho$ na_mUwH$aU H$s Eo W nr g~go H$_ hmoVr h & Sc3+ a JhrZ hmoVm h O~{H$ 3d `m {JH$mo H$s VwbZm _| grar O Ho$ V dm| _| go Ti3+ a JrZ Zn H$s hmoVm h & 3 OR Assign suitable reasons for the following : (a) The Mn2+ compounds are more stable than Fe2+ towards oxidation to their + 3 state. (b) In the 3d series from Sc (Z = 21) to Zn (Z = 30), the enthalpy of atomization of Zn is the lowest. (c) 56/2/1 Sc3+ is colourless in aqueous solution whereas Ti3+ is coloured. 9 P.T.O. 24. {Z Z A{^{H $`mAm| _| A, B Am a C H$s g aMZmE ~VmBE : 3 (i) HNO2 LiAlH4 KCN CH3Br A B C 273 K (ii) NH3 CHCl3 NaOH Br2 KOH CH3COOH A B C Give the structures of A, B and C in the following reactions : (i) (ii) 25. HNO2 LiAlH4 KCN CH3Br A B C 273 K NH3 CHCl3 NaOH Br2 KOH CH3COOH A B C {Z Z nXm| H$s n[a^mfmE {b{IE : (a) EoZmo_a (b) moQ>rZm| H$m {dH $VrH$aU (c) Amd `H$ Eo_rZmoo A b 3 Define the following terms : (a) (b) Denaturation of proteins (c) Essential amino acids (i) (iii) Eo Q>r{h Q>m_rZ H$s EH$ CXmhaU g{hV n[a^mfm {b{IE & {Z Z Am f{Y`m| _| go H$m Z-gr {VO {dH$ h : _m \$s Z, B dm{Zb, bmoaEo \ ${ZH$mob, Eop n[aZ & Eo nmQ> o_ H$m Cn`moJ R> S>o ^moOZ Am a no` nXmWm o VH$ gr{_V `m| hmoVm h (i) Define Antihistamine with an example. (ii) Which one of the following drugs is an antibiotic : Morphine, Equanil, Chloramphenicol, Aspirin. (iii) 26. Anomers Why is use of aspartame limited to cold food and drink ? (ii) 56/2/1 10 ? 3 27. bmp Q>>H$ Ho$ W bm| na {V~ Y bJ OmZo Ho$ Cnam V, EH$ Hy$b Ho$ N>m m| Zo {ZU ` {b`m {H$ dh bmoJm| H$mo dmVmdaU Am a `_wZm ZXr na bmp Q>>H$ Ho$ W bm| Ho$ hm{ZH$maH$ ^mdm| go gy{MV H$a|Jo & ~mV H$mo A{YH$ ^mdr ~ZmZo Ho$ {bE, C hm|Zo X gao Hy$bm| Ho$ gmW {_bH$a EH$ a br aMr Am a gp O`m ~oMZo dmbm|, X H$mZXmam| Am a {S>nmQ> _o Q>b Q>moam| _| H$m J O Ho$ W bo ~m Q>o & g^r N>m m| Zo U {H$`m {H$ do `_wZm ZXr H$mo ~MmZo Ho$ {bE ^{d ` _| nm brWrZ Ho$ W bm| H$m `moJ Zht H$a|Jo & Cn`w $ boIm e H$mo n T>H$a {Z Z Zm| Ho$ C ma Xr{OE : (i) N>m m| o Zo {H$Z _y `m| H$mo Xem `m h (ii) O d-{Z ZrH$aUr` ~h bH$ `m hmoVo h ? EH$ CXmhaU Xr{OE & (iii) `m nm brWrZ EH$ g_ (hmo_mo) ~h bH$ h AWdm gh (co-) ~h bH$ h 3 ? ? After the ban on plastic bags, students of one school decided to create awareness among the people about the harmful effects of plastic bags on the environment and the Yamuna river. To make it more impactful, they organized a rally by joining hands with other schools and distributed paper bags to vegetable vendors, shopkeepers and departmental stores. All students pledged not to use polythene bags in future to save the Yamuna river. After reading the above passage, answer the following questions : (i) (ii) What are biodegradable polymers ? Give one example. (iii) 56/2/1 What values are shown by the students ? Is polythene a homopolymer or copolymer ? 11 P.T.O. 28. (a) (b) (a) dm nerb Ad`dm| dmbo {db`Z Ho$ {bE amC Q> {Z`_ {b{IE & g^r gm Um|o Am a VmnH $_m| na amC Q> {Z`_ AZwgma ahZo dmbo {db`Z H$m Zm_ {b{IE & Ob _| 10 g CaCl2 KmobZo go m h E {db`Z Ho$ {bE dWZm H$ C `Z H$mo n[aH${bV H$s{OE & (Ob Ho$ {bE Kb = 0.512 K kg mol 1, CaCl2 H$m _moba `_mZ = 111 g mol 1) AWdm 200 g {Z Z nXm| H$s n[a^mfmE {b{IE : p Wa dmWr (Eo{ O`moQ >mon) (ii) namgaUr (Amog_m {Q>H$) Xm~ (iii) (a) AUwg ` (H$mo{bJo{Q>d) JwUY_ 9.8% (w/w) H2SO4 Ho$ {db`Z H$s _mobaVm n[aH${bV H$s{OE `{X Bg {db`Z H$m KZ d 1.02 g ml 1 hmo & (H2SO4 H$m _moba `_mZ = 98 g mol 1) State Raoult s law for a solution containing volatile components. Name the solution which follows Raoult s law at all concentrations and temperatures. (b) Calculate the boiling point elevation for a solution prepared by adding 10 g of CaCl2 to 200 g of water. (Kb for water = 0.512 K kg mol 1, Molar mass of CaCl2 = 111 g mol 1) OR (a) Define the following terms : (i) Osmotic pressure (iii) 56/2/1 Azeotrope (ii) (b) 3 3 (i) (b) 2 Colligative properties Calculate the molarity of 9.8% (w/w) solution of H2SO4 if the density of the solution is 1.02 g ml 1. (Molar mass of H2SO4 = 98 g mol 1) 12 2 29. (a) {Z Z Ho$ H$maU ~VmBE : (i) + 5 Ad Wm _| Bi ~b CnMm`H$ hmoVm h & (ii) PCl5 Vmo OmZm OmVm h na Vw NCl5 Zht & (iii) bm h HCl _| KwbH$a FeCl2 ~ZmVm h , FeCl3 Zht & 3 (b) {Z Z H$s g aMZmE ~ZmBE : 2 (i) XeOF4 (ii) HClO4 AWdm (a) {Z Z H$s g aMZmE ~ZmBE : (i) (b) H2S2O8 (ii) bmb 2 P4 {Z Z Ho$ H$maU {b{IE : 3 (i) (ii) OrZm Z go {^ , hr{b`_ H$m H$moB n Q amgm`{ZH$> `m {JH$ kmV Zht h & (iii) (a) dm n Ad Wm _| J YH$ (g \$a) AZwMw ~H$ d X{e V H$aVm h & H3PO3 go H3PO2 EH$ A{YH$ ~b AnMm`H$ h & Account for the following : (i) (ii) PCl5 is known but NCl5 is not known. (iii) (b) Bi is a strong oxidizing agent in the + 5 state. Iron dissolves in HCl to form FeCl2 and not FeCl3. Draw the structures of the following : (i) XeOF4 (ii) HClO4 OR (a) Draw the structures of the following : (i) (ii) 56/2/1 H2S2O8 Red P4 13 P.T.O. (b) 30. Account for the following : (i) Sulphur in vapour state exhibits paramagnetism. (ii) Unlike xenon, no distinct chemical compound of helium is known. (iii) H3PO2 is a stronger reducing agent than H3PO3. (a) EoWoZ b Ho$ {Z Z A{^H$maH$m| Ho$ gmW A{^{H $`m H$aZo na ~Zo C nmXm| H$mo {b{IE (i) CH3MgBr go Am a {\$a H3O+ go (ii) Zn-Hg/gm HCl go 3 (iii) (b) VZw NaOH H$s Cnp W{V _| C6H5CHO go {Z Z `m {JH$ `w _m o _| na na ^oX H$aZo Ho$ {bE gab amgm`{ZH$ narjU Xr{OE (i) ~o OmoBH$ A b Am a E{Wb ~o OmoEQ> (ii) monoZ b Am a `yQ>oZ-2-AmoZ AWdm : : (a) {Z Z Ho$ H$maU {b{IE : (i) HCN Ho$ gmW A{^{H $`m H$aZo _| CH3COCH3 go CH3CHO A{YH$ A{^{H $`merb hmoVm h & (ii) go_rH$m~ o OmBS> (H2NNHCONH2) _| Xmo NH2 J wn hmoVo h & {\$a ^r go_rH$m~m OmoZ ~ZmZo _| Ho$db EH$ NH2 J wn {H $`mH$mar hmoVm h & (b) {Z Z Zm_Ymar A{^{H $`mAmo Ho$ {bE amgm`{ZH$ g_rH$aU {b{IE (i) amo OoZ_w S A{^{H $`m (ii) hob-dmobmS> - Oo{b H$s A{^{H $`m (iii) H $Zr Omamo A{^{H $`m (a) Write the products formed when ethanal reacts with the following reagents : (i) (ii) Zn-Hg/conc. HCl (iii) 56/2/1 CH3MgBr and then H3O+ C6H5CHO in the presence of dilute NaOH 14 : 2 2 3 (b) Give simple chemical tests to distinguish between the following pairs of compounds : (i) Benzoic acid and Ethyl benzoate (ii) Propanal and Butan-2-one OR (a) Account for the following : (i) (ii) (b) CH3CHO is more reactive than CH3COCH3 towards reaction with HCN. There are two NH2 groups in semicarbazide (H2NNHCONH2). However, only one is involved in the formation of semicarbazone. Write the chemical equation to illustrate each of the following name reactions : (i) (ii) Hell-Volhard-Zelinsky reaction (iii) 56/2/1 Rosenmund reduction Cannizzaro reaction 15 2,800 P.T.O.

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