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CBSE Class XII 2014 : CHEMISTRY

15 pages, 145 questions, 85 questions with responses, 124 total responses,    0    0
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H$moS> Z . Series OSR Code No. amob Z . 56/1 narjmWu H$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 56/1 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$s AZw_{V Zht h & General Instructions : (i) All questions are compulsory. (ii) Questions number 1 to 8 are very short-answer questions and carry 1 mark each. (iii) Questions number 9 to 18 are short-answer questions and carry 2 marks each. (iv) Questions number 19 to 27 are also short-answer questions and carry 3 marks each. (v) Questions number 28 to 30 are long-answer questions and carry 5 marks each. (vi) Use Log Tables, if necessary. Use of calculators is not allowed. 1. amgm`{ZH$ emofU (chemisorption) na VmnH $_ H$m `m ^md hmoVm h ? 1 What is the effect of temperature on chemisorption ? 2. {g da Ho$ {Z H$f U _| { O H$ YmVw H$m `m H$m` hmoVm h ? 1 What is the role of zinc metal in the extraction of silver ? 3. H3PO3 H$s jmaH$Vm (~o{gH$Vm) {H$VZr hmoVr h What is the basicity of H3PO3 ? 56/1 2 ? 1 4. {Z Z Omo S>o _| {H$aob AUw H$mo nhMm{ZE : 1 Identify the chiral molecule in the following pair : 5. {Z Z _| go H$m Z-gm mH ${VH$ ~h bH$ h ~yZm-S, moQ>rZ|, PVC ? 1 Which of the following is a natural polymer ? Buna-S, Proteins, PVC 6. mW{_H$ Eoamo_ {Q>H$ Eo_rZm| Ho$ S>mBE Omo{Z`_ bdUm| _| n[adV Z H$mo {H$g Zm_ go OmZm OmVm h ? 1 The conversion of primary aromatic amines into diazonium salts is known as ___________ . 7. `yH $mog Ho$ Ob-AnKQ>Z (hydrolysis) Ho$ C nmX `m h ? 1 What are the products of hydrolysis of sucrose ? 8. p-_o{Wb~ O p S>hmBS> H$s g aMZm {b{IE & 1 Write the structure of p-methylbenzaldehyde. 9. KZ d 2.8 g cm 3 H$m EH$ V d \$bH$ Ho$p V KZmH$ma (f.c.c.) H$ma H$m _m H$ gob ~ZmVm h {OgHo$ {H$Zmao H$s b ~mB 4 10 8 cm h & Bg V d H$m _moba `_mZ n[aH${bV H$s{OE & ({X`m J`m h : NA = 6.022 1023 _mob 1) 2 An element with density 2.8 g cm 3 forms a f.c.c. unit cell with edge length 4 10 8 cm. Calculate the molar mass of the element. (Given : NA = 6.022 1023 mol 1) 56/1 3 P.T.O. 10. (i) LiCl Ho$ Jwbm~r a J Ho$ {bE BgH$m {H$g (non-stoichiometric) Xmof C maXm`r hmoVm h ? (ii) NaCl H$ma H$m A-agg_rH$aU{_Vr` {H$g H$ma H$m agg_rH$aU{_Vr` Xmof {XImVm h ? 2 AWdm {Z Z{b{IV nXm| Ho$ Omo S>m| Ho$ ~rM Amn {d^oXZ H $go H$a|Jo (i) Q>oQ >mhoS >b VWm Am Q>mhoS >b [a{ $`m (ii) {H $ Q>b OmbH$ VWm _m H$ gob : 2 (i) What type of non-stoichiometric point defect is responsible for the pink colour of LiCl ? (ii) What type of stoichiometric defect is shown by NaCl ? OR How will you distinguish between the following pairs of terms : (i) (ii) 11. Tetrahedral and octahedral voids Crystal lattice and unit cell Am`Zm| Ho$ dV nbm`Z g ~ Yr H$mobamD$e (Kohlrausch) {Z`_ {b{IE & VZwH$aU na {db`Z H$s MmbH$Vm H$_ `m| hmo OmVr h ? 2 State Kohlrausch law of independent migration of ions. Why does the conductivity of a solution decrease with dilution ? 12. EH$ amgm`{ZH$ A{^{H $`m, R P Ho$ {bE, g_` Bg J m\$ _| {XIm`m J`m h & (order) gwPmBE (i) (ii) 56/1 Bg A{^{H $`m H$s H$mo{Q> dH $ H$s dUVm (T>bmZ) `m hmoJr ? 4 & (t) Ho$ {V gm Vm (R) _| n[adV Z H$mo 2 For a chemical reaction R P, the variation in the concentration (R) vs. time (t) plot is given as (i) (ii) 13. Predict the order of the reaction. What is the slope of the curve ? YmVwAm| Ho$ {d wV -AnKQ>Zr n[a H$aU H$m AmYma_yb {g m V g_PmBE & BgH$m EH$ CXmhaU Xr{OE & 2 Explain the principle of the method of electrolytic refining of metals. Give one example. 14. {Z Z g_rH$aUm| H$mo nyam H$s{OE (i) 2 P4 + H2O (ii) : XeF4 + O2F2 Complete the following equations : (i) (ii) 15. P4 + H2O XeF4 + O2F2 {Z Z H$s g aMZmE ~ZmBE (i) 2 XeF2 (ii) : BrF3 Draw the structures of the following : (i) (ii) 16. XeF2 BrF3 {Z Z A{^{H $`mAm| go g ~p YV g_rH$aU {b{IE (i) amB_a Q>r_Z A{^{H $`m (ii) {d{b`_gZ g bofU (synthesis) : 2 Write the equations involved in the following reactions : (i) Reimer Tiemann reaction (ii) Williamson synthesis 56/1 5 P.T.O. 17. {Z Z A{^{H $`m H$s {H $`m{d{Y {b{IE : 2 HBr CH3CH2OH CH3CH2Br + H2O Write the mechanism of the following reaction : HBr CH3CH2OH CH3CH2Br + H2O 18. {Z Z ~h bH$m| H$mo m H$aZo Ho$ {bE `w $ EH$bH$m| Ho$ Zm_ {b{IE (i) 2 ~oHo$bmBQ> (ii) : {ZAmo rZ Write the name of monomers used for getting the following polymers : (i) (ii) 19. Bakelite Neoprene (a) A{^{H $`m Mg (s) + Cu2+ (Obr`) Mg2+ (Obr`) + Cu (s) Ho$ {bE rG (a) n[aH${bV H$s{OE & o : E gob = + 2.71 V, 1 F = 96500 C _mob 1 {X`m J`m h (b) o Anmobmo (Apollo) A V[aj moJ m_ Ho$ {bE {d wV e{ $ Cnb Y H$amZo Ho$ {bE `w $ gob Ho$ H$ma H$m Zm_ {b{IE & o Calculate rG for the reaction Mg (s) + Cu2+ (aq) Mg2+ (aq) + Cu (s) o Given : E (b) 56/1 cell = + 2.71 V, 1 F = 96500 C mol 1 Name the type of cell which was used in Apollo space programme for providing electrical power. 6 3 20. p Wa Am`VZ Ad Wm _| SO2Cl2 Ho$ W_ H$mo{Q> Ho$ Vmnr` {dKQ>Z Ho$ Xm amZ {Z Z{b{IV Am H$ S>o m h E : SO2Cl2 (J g) SO2 (J g) + Cl2 (J g) `moJ g_`/s 1 gH$b Xm~/dm`w_ S>b 1 0 0 .4 2 100 0 .7 doJ {Z`Vm H$ n[aH${bV H$s{OE & ({X`m J`m h : log 4 = 0.6021, 3 log 2 = 0.3010) 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) 21. B_ e g `m hmoVo h Xr{OE & ? BZHo$ {d{^ H$ma `m h ? `oH$ H$ma H$m EH$$ CXmhaU 3 What are emulsions ? What are their different types ? Give one example of each type. 22. {Z Z{b{IV Ho$ H$maU Xr{OE 3 : (i) (CH3)3 P = O Vmo (ii) Bbo Q >m Z m H$aZo H$s G$Um _H$ {M dmbr E W nr H$m _mZ g \$a H$s Anojm Am grOZ Ho$ {bE H$_ hmoVm h & H3PO3 H$s Anojm H3PO2 A{YH$ ~b AnMm`H$ h & (iii) 56/1 nm`m OmVm h na Vw 7 (CH3)3 N = O Zht {_bVm & P.T.O. Give reasons for the following : (i) (ii) Oxygen has less electron gain enthalpy with negative sign than sulphur. (iii) H3PO2 is a stronger reducing agent than H3PO3. (i) g H$a (ii) g H$a [Co(en)3]3+ {H$g H$ma H$s g_md`dVm {XImVm h (en = B WoZ-1,2-S>mBEo_rZ) (iii) 23. (CH3)3 P = O exists but (CH3)3 N = O does not. [NiCl4]2 [Cr(NH3)4 Cl2]Cl H$m IUPAC Zm_ {b{IE & ? `m| AZwMw ~H$s` hmoVm h O~{H$ [Ni(CO)4] {VMw ~H$s` hmoVm h (na_mUw H $_m H$$ : Cr = 24, Co = 27, Ni = 28) (i) 3 Write the IUPAC name of the complex [Cr(NH3)4 Cl2]Cl. (ii) ? What type of isomerism is exhibited by the complex [Co(en)3]3+ ? (en = ethane-1,2-diamine) (iii) (a) {Z Z _| go `oH$ A{^{H $`m Ho$ _wI EH$h bmoOZr C nmXm| H$s g aMZmE ~ZmBE : (b) 24. Why is [NiCl4]2 paramagnetic but [Ni(CO)4] is diamagnetic ? (At. nos. : Cr = 24, Co = 27, Ni = 28) {Z Z `w _m| _| go H$m Z-gm h bmoOZr `m {JH$ A{^{H $`m H$aoJm : (i) CH3Br AWdm CH3I (ii) 56/1 (CH3)3 C Cl AWdm CH3 Cl 8 SN2 A{^{H $`m _| A{YH$ Vrd Vm go 3 (a) Draw the structures of major monohalo products in each of the following reactions : (b) Which halogen compound in each of the following pairs will react faster in SN2 reaction : (i) (ii) 25. CH3Br or CH3I (CH3)3 C Cl or CH3 Cl {Z Z{b{IV Ho$ H$maU {b{IE : 3 (i) V Vr`H$ Eo_rZm| hmoVo h & (R3N) H$s (ii) Eo{ZbrZ \ $sS>ob (iii) Obr` {db`Z _| VwbZm _| mW{_H$ Eo_rZm| (R-NH2) Ho$ dWZm H$ C Va H $m Q> g A{^{H $`m Zht XoVr & (CH3)3N H$s VwbZm _| (CH3)2NH A{YH$ jmar` hmoVr h & AWdm {Z Z A{^{H $`mAm| _| A, B Am a C H$s g aMZmE Xr{OE : (i) Sn HCl H2O NaNO2 HCl C6H5NO2 A C B 273 K (ii) 3 H 2O / H Br2 KOH NH3 C A CH3CN B Account for the following : (i) Primary amines (R-NH2) have higher boiling point than tertiary amines (R3N). (ii) Aniline does not undergo Friedel Crafts reaction. (iii) (CH3)2NH is more basic than (CH3)3N in an aqueous solution. OR 56/1 9 P.T.O. Give the structures of A, B and C in the following reactions : (i) Sn HCl H2O NaNO2 HCl C6H5NO2 C A B 273 K (ii) H 2O / H Br2 KOH NH3 CH3CN C A B 26. moQ>rZm| go g ~p YV {Z Z nXm| H$s n[a^mfmE Xr{OE (i) no Q>mBS> Am~ Y (ii) mW{_H$ g aMZm (iii) {dH $VrH$aU : 3 Define the following terms as related to proteins : (i) (ii) Primary structure (iii) 27. Peptide linkage Denaturation {d d dm ` {Xdg Ho$ Adga na, S>m . gVnmb Zo nmg Ho$ Jm d _| ahZo dmbo YZhrZ {H$gmZm| Ho$ {bE EH$ dm ` H $ n bJm`m & Om M Ho$ ~mX, Cgo `h XoI H$a Y H$m bJm {H$ ~ma-~ma H$sQ>ZmeH$m| Ho$ g nH $ _| AmZo Ho$ H$maU {H$gmZm| _| go A{YH$m| H$mo H $ ga H$m amoJ hmo J`m Wm & CZ_| go ~h Vm| H$mo _Yw_oh ^r Wm & C hm|Zo CZ_| YZ_w $ Am f{Y`m ~m Q>t & S>m . gVnmb Zo Bg ~mV H$s gyMZm V H$mb ZoeZb y_Z amBQ >g H${_eZ (NHRC) H$mo Xr & NHRC Ho$ gwPmdm| na gaH$ma Zo {ZU ` {b`m H$s S>m Q>ar ghm`Vm Am a {d mr` ghm`Vm bmoJm| H$mo Xr OmE Am a ^maV Ho$ g^r Jm dm| _| KmVH$ amoJm| Ho$ ^md H$mo amoH$Zo Ho$ {bE A `{YH$ gw{dYm dmbo A nVmb Imobo OmE & (i) (ii) Ap V_ H $ ga _| nr S>m go ~MmZo Ho$ {bE _w `V`m H$m Z-gr nr S>mZmeH$ Am f{Y`m `w $ H$s OmVr h ? (iii) 56/1 (a) _Yw_oh Ho$ amo{J`m| Ho$ {bE gwPmE JE H ${ _ _YwH$mam| _| go {H$gr EH$ H$m CXmhaU Xr{OE & S>m . gVnmb Am a (b) NHRC mam 10 Xem B JB _m ` ~mV| {b{IE & 3 On the occasion of World Health Day, Dr. Satpal organized a health camp for the poor farmers living in a nearby village. After check-up, he was shocked to see that most of the farmers suffered from cancer due to regular exposure to pesticides and many were diabetic. They distributed free medicines to them. Dr. Satpal immediately reported the matter to the National Human Rights Commission (NHRC). On the suggestions of NHRC, the government decided to provide medical care, financial assistance, setting up of super-speciality hospitals for treatment and prevention of the deadly disease in the affected villages all over India. (i) Write the values shown by (a) Dr. Satpal (b) NHRC. (ii) (iii) 28. What type of analgesics are chiefly used for the relief of pains of terminal cancer ? Give an example of artificial sweetener that could have been recommended to diabetic patients. (a) {Z Z nXm| H$s n[a^mfm Xr{OE (i) (b) _mobaVm (ii) _mobb C `Z p Wam H$ : (Kb) EH$ Obr` {db`Z _| {V {bQ>a {db`Z _| 15 g `y[a`m (_moba `_mZ = 60 g _mob 1) Kw{bV h & Bg {db`Z H$m namgaU Xm~ Ob _| byH$mo O (_moba `_mZ = 180 g _mob 1) Ho$ EH$ {db`Z Ho$ g_mZ (g_namgar) h & EH$ {bQ>a {db`Z _| Cnp WV byH$mo O H$m `_mZ n[aH${bV H$s{OE & 2, 3 AWdm 56/1 11 P.T.O. ? (a) EWoZm b Am a EogrQ>moZ H$m {_lU {H$g H$ma H$m {dMbZ {XImVm h Xr{OE & (b) Ob _| byH$mo O (_moba `_mZ = 180 g _mob 1) Ho$ EH$ {db`Z na bo~b bJm h , 10% ( `_mZ AZwgma) & Bg {db`Z H$s _mobbVm Am a _mobaVm `m hm|Jo ? ({db`Z H$m KZ d = 1.2 g mL 1) (a) Define the following terms : (i) Molarity (ii) (b) H$maU Molal elevation constant (Kb) A solution containing 15 g urea (molar mass = 60 g mol 1) per litre of solution in water has the same osmotic pressure (isotonic) as a solution of glucose (molar mass = 180 g mol 1) in water. Calculate the mass of glucose present in one litre of its solution. OR (a) What type of deviation is shown by a mixture of ethanol and acetone ? Give reason. (b) A solution of glucose (molar mass = 180 g mol 1) in water is labelled as 10% (by mass). What would be the molality and molarity of the solution ? (Density of solution = 1.2 g mL 1) 29. (a) {Z Z g_rH$aUm| H$mo nyam H$s{OE : (i) (ii) 56/1 Cr2O72 + 2OH MnO4 + 4H+ + 3e 12 2, 3 (b) {Z Z Ho$ H$maU {b{IE : (i) Zn (ii) g H $_U YmVw ~h V go g H$a ~ZmVo h & (iii) Mn3+/Mn2+ `w _, Cr3+/Cr2+ `w _ H$mo g H $_U V d Zht _mZm OmVm & go H$ht A{YH$ Eo _mZ aIVm h & 2, 3 AWdm (i) g aMZm n[adV ZerbVm Am a amgm`{ZH$ A{^{H $`merbVm Ho$ g X^ _| b WoZm BS>m| Am a Eop Q>Zm `S>m| Ho$ ~rM ^oX {b{IE & (ii) b WoZm BS> m Ibm Ho$ Cg gX ` H$m Zm_ {b{IE, Omo {XImZo Ho$ {bE {g h & (iii) {Z Z g_rH$aU H$mo nyam H$s{OE +4 Am grH$aU Ad Wm : MnO4 + 8H+ + 5e (iv) Mn3+ Am a Cr3+ (na_mUw H $_m H$ (a) _| go H$m Z A{YH$ AZwMw ~H$s` h Am a `m| : Mn = 25, Cr = 24) 5 Complete the following equations : (i) Cr2O72 + 2OH (ii) (b) ? MnO4 + 4H+ + 3e Account for the following : (i) Zn is not considered as a transition element. (ii) Transition metals form a large number of complexes. (iii) The E value for the Mn3+/Mn2+ couple is much more positive o than that for Cr3+/Cr2+ couple. OR 56/1 13 P.T.O. (i) With reference to structural variability and chemical reactivity, write the differences between lanthanoids and actinoids. (ii) Name a member of the lanthanoid series which is well known to exhibit +4 oxidation state. (iii) Complete the following equation : MnO4 + 8H+ + 5e (iv) Out of Mn3+ and Cr3+, which is more paramagnetic and why ? (Atomic nos. : Mn = 25, Cr = 24) 30. (a) {Z Z A{^H$maH$m| go (i) (b) H2N OH (iii) VZw A{^{H $`m H$aZo na ~Zo C nmXm| H$mo {b{IE : HCN (ii) CH3CHO H$s NaOH CH3CHO H$s Cnp W{V _| {Z Z `m {JH$ `w _m| _| A Va {XImZo Ho$ {bE gab amgm`{ZH$ narjU {b{IE : (i) ~ OmoBH$ A b Am a \$sZm b (ii) monoZb Am a monoZmoZ 3, 2 AWdm (a) {Z Z Ho$ H$maU {b{IE : (i) (ii) (b) CH3COOH H$s VwbZm _| Cl CH2COOH A{YH$ ~b A b h & H$m~m}p g{bH$ A b H$m~m}{Zb g_yh H$s A{^{H $`mE Zht XoVo & {Z Z Zm_ Ym[aV A{^{H $`mAm| Ho$ {bE amgm`{ZH$ g_rH$aU {b{IE (i) (c) amo OoZ_w S> AnM`Z (ii) H ${Z Omamo A{^{H $`m CH3CH2 CO CH2 CH3 H$m Z Am`moS>mo \$m _ narjU XoVm h 56/1 : Am a ? CH3CH2 CH2 CO CH3 _| go 2, 2, 1 14 (a) Write the products formed when CH3CHO reacts with the following reagents : (i) (ii) H2N OH (iii) (b) HCN CH3CHO in the presence of dilute NaOH Give simple chemical tests to distinguish between the following pairs of compounds : (i) Benzoic acid and Phenol (ii) Propanal and Propanone OR (a) Account for the following : (i) (ii) (b) Cl CH2COOH is a stronger acid than CH3COOH. Carboxylic acids do not give reactions of carbonyl group. Write the chemical equations to illustrate the following name reactions : (i) (ii) (c) Rosenmund reduction Cannizzaro s reaction Out of CH3CH2 CO CH2 CH3 and CH3CH2 CH2 CO CH3, which gives iodoform test ? 56/1 15 P.T.O.

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