agm`z {dkmz (g ÕmpÝVH$) {ZYm [av g_` : 3 KÊQ>o A{YH$V_ A H$ : 70 Series OSR/1/C H$moS> Z. 56/1/2 Code No.
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1 Series OSR/1/C H$moS> Z. 56/1/2 Code No. amob Z. Roll No. narjmwu H$moS >H$mo CÎma-nwpñVH$m Ho$ _wi-n ð >na Adí` {bio & Candidates must write the Code on the title page of the answer-book. H $n`m Om±M H$a b {H$ Bg àíz-nì _o _w{ðv n ð> 12 h & àíz-nì _ Xm{hZo hmw H$s Amoa {XE JE H$moS >Zå~a H$mo N>mÌ CÎma-nwpñVH$m Ho$ _wi-n ð> na {bi & H $n`m Om±M H$a b {H$ Bg àíz-nì _ >30 àíz h & H $n`m àíz H$m CÎma {bizm ewê$ H$aZo go nhbo, àíz H$m H«$_m H$ Adí` {bi & Bg àíz-nì H$mo n T>Zo Ho$ {be 15 {_ZQ >H$m g_` {X`m J`m h & àíz-nì H$m {dvau nydm _ ~Oo {H$`m OmEJm & ~Oo go ~Oo VH$ N>mÌ Ho$db àíz-nì H$mo n T> Jo Am a Bg Ad{Y Ho$ Xm amz do CÎma-nwpñVH$m na H$moB CÎma Zht {bi Jo & Please check that this question paper contains 12 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 a.m. From a.m. to 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 ÕmpÝVH$) CHEMISTRY (Theory) {ZYm [av g_` : 3 KÊQ>o A{YH$V_ A H$ : 70 Time allowed : 3 hours Maximum Marks : 70 56/1/2 1 P.T.O.
2 gm_mý` {ZX}e : (iv) (v) (vi) g^r àíz A{Zdm` h & àíz-g»`m 1 go 8 VH$ A{V bkw-cîmar` àíz h & àë`oh$ àíz Ho$ {be 1 A H$ h & àíz-g»`m 9 go 18 VH$ bkw-cîmar` àíz h & àë`oh$ àíz Ho$ {be 2 A H$ h & àíz-g»`m 19 go 27 VH$ ^r bkw-cîmar` àíz h & àë`oh$ àíz Ho$ {be 3 A H$ h & àíz-g»`m 28 go 30 VH$ XrK -CÎmar` àíz h & àë`oh$ àíz Ho$ {be 5 A H$ h & Amdí`H$VmZwgma bm J Q>o~bm H$m à`moj H$a & H $ëhw$boq>am Ho$ Cn`moJ H$s AZw_{V Zht h & General Instructions : (iv) (v) (vi) All questions are compulsory. Questions number 1 to 8 are very short-answer questions and carry 1 mark each. Questions number 9 to 18 are short-answer questions and carry 2 marks each. Questions number 19 to 27 are also short-answer questions and carry 3 marks each. Questions number 28 to 30 are long-answer questions and carry 5 marks each. Use Log Tables, if necessary. Use of calculators is not allowed. 1. NaCl {H$g àh$ma H$m ñq>m B{H$`mo_rQ >r Xmof Xem Vm h? 1 What type of stoichiometric defect is shown by NaCl? 2. B_ëeZ (emulsions) H$mo n[a^m{fv H$s{OE & 1 Define Emulsions. 3. XeF 4 H$s g amzm Amao{IV H$s{OE & 1 Draw the structure of XeF 4. 56/1/2 2
3 4. Eobw{_{Z`_ Ho$ {ZîH$f U _ {dewõ Eobw{_Zm (Al 2 O 3 ) àmá H$aZo _ CO 2 Ûmam Š`m ^y{_h$m AXm H$s OmVr h? 1 What role is played by CO 2 in getting pure alumina (Al 2 O 3 ) in the extraction of aluminium? 5. 2-~«mo_monoÝQ>oZ H$s g amzm Amao{IV H$s{OE & 1 Draw the structure of 2-bromopentane. 6. g H«$_U VÎd n[adv Zr` Am ŠgrH$aU AdñWmE± Š`m Xem Vo h? 1 Why do transition elements show variable oxidation states? 7. CH 3 NH 2 Am a (CH 3 ) 3 N _ go, {H$g EH$ H$m ŠdWZm H$ A{YH$ h? 1 Out of CH 3 NH 2 and (CH 3 ) 3 N, which one has higher boiling point? 8. {ZåZ{b{IV `m {JH$ H$m IUPAC Zm_ {b{ie : 1 Write the IUPAC name of the following compound : 9. EH$ {db`z H$s _mobavm Am a _mobbvm _ A Va ñnï> H$s{OE & {db`z H$s _mobbvm _mz H$mo _mobavm _mz _ h_ H $go n[ad{v V H$a gh$vo h? 2 Differentiate between molarity and molality of a solution. How can we change molality value of a solution into molarity value? 10. (a) EH$ A{^{H«$`m, A + B CËnmX, Ho$ {be doj {Z`_, Rate = k[a] 1 [B] 2 go {X`m J`m h & A{^{H«$`m H$s H$mo{Q> Š`m h? (b) àw_ H$mo{Q> A{^{H«$`m Ho$ {be doj {Z`Vm H$ k H$s BH$mB {b{ie & 2 (a) (b) For a reaction, A + B Product, the rate law is given by, Rate = k[a] 1 [B] 2. What is the order of the reaction? Write the unit of rate constant k for the first order reaction. 56/1/2 3 P.T.O.
4 11. {ZåZ àh«$_m Ho$ nrn>o Omo {gõmýv {Z{hV hmovo h CZH$m du Z H$s{OE : 2 A`ñH$m Ho$ gm ÐU _ PmJ ßbdZ àh«$_ YmVwAm H$m dmîn àmdñwm n[aîh$au Describe underlying principles of the following processes : Froth floatation process of concentration of ores Vapour phase refining of metals 12. {ZåZ `m {JH$m H$s g amzme± Amao{IV H$s{OE : 2 H 2 SO 3 N 2 O 5 Draw the structures of the following compounds : H 2 SO 3 N 2 O {ZåZ{b{IV àë`oh$ AdbmoH$Z Ho$ {be Cn`wº$ H$maU {b{ie : 2 g H«$_U YmVwE± (Zn, Cd Am a Hg H$mo N>mo S>H$a) R>mog (H$R>moa) Am a Cƒ JbZm H$ Am a ŠdWZm H$ dmbr hmovr h & g H«$_U YmVwAm H$s àw_ lour _ Am`ZZ EÝW pën`m± (àw_ Am a {ÛVr`) A{Z`{_V ê$n go n[ad{v V hmovr h & AWdm b ÝWoZm `S> g Hw$MZ Š`m h? b ÝWoZm `S> g Hw $MZ H$m EH$ n[aum_ Xr{OE & Assign a reason for each of the following observations : The transition metals (with the exception of Zn, Cd and Hg) are hard and have high melting and boiling points. The ionisation enthalpies (first and second) in the first series of the transition elements are found to vary irregularly. OR What is lanthanoid contraction? Write a consequence of lanthanoid contraction. 56/1/2 4
5 14. {ZåZ _ go àë`oh$ Ho$ {be H$maU {b{ie : 2 g H«$_U VÎd AZwMwå~H$s` JwU {XImVo h & Co 2+ gabvm go à~b {bj ÊS> H$s CnpñW{V _ Am ŠgrH $V hmo OmVm h & Assign reason for each of the following : Transition elements exhibit paramagnetic behaviour. Co 2+ is easily oxidised in the presence of a strong ligand. 15. ½byH$mog H$s CZ A{^{H«$`mAm H$m {ddau Xr{OE {OÝh BgH$s Iwbr ûm Ibm g amzmam Ûmam Zht g_pm`m Om gh$vm h & 2 Enumerate the reactions of glucose which cannot be explained by its open chain structures. 16. {ZåZ{b{IV A{^{H«$`mAm Ho$ g_rh$au {b{ie : 2 {d{b`ågz B Wa g íbofu H$moë~o A{^{H«$`m Write the equations involved in the following reactions : Williamson ether synthesis Kolbe s reaction 17. {ZåZ{b{IV àízm Ho$ CÎma Xr{OE : 2 {dq>m{_z A Am a {dq>m{_z C h_mao {be Š`m AË`mdí`H$ h? Ý`ypŠbAmogmBS> Am a Ý`ypŠbAmoQ>mBS> _ Š`m A Va hmovm h? Answer the following questions : Why are vitamin A and vitamin C essential for us? What is the difference between a nucleoside and a nucleotide? 18. {ZåZ{b{IV n[adv Zm H$mo {H$g àh$ma {H$`m Om gh$vm h? 2 àmonrz go àmonoz-2-am b E{Wb ŠbmoamBS> go EWmZb How are the following conversions carried out? Propene to Propan-2-ol Ethyl chloride to Ethanal 56/1/2 5 P.T.O.
6 19. EH$ A{^{H«$`m _ hmbs >mooz noam ŠgmBS>, H 2 O 2 (Obr`), H 2 O (l) Am a O 2 (g) _ AnK{Q>V hmovm h & A{^{H«$`m H 2 O 2 _ àw_ H$mo{Q> H$s h Am a doj {Z`Vm H$ k = min 1 h & H 2 O 2 Ho$ EH$ à{vxe Ho$ 15% H$mo AnK{Q>V hmozo _ {H$VZm g_` bjojm? à{vxe Ho$ 85% H$mo AnK{Q>V hmozo _ {H$VZm g_` bjojm? 3 Hydrogen peroxide, H 2 O 2 (aq) decomposes to H 2 O (l) and O 2 (g) in a reaction that is first order in H 2 O 2 and has a rate constant k = min 1. How long will it take for 15% of a sample of H 2 O 2 to decompose? How long will it take for 85% of the sample to decompose? kg Ob Ho$ gmw Hw$N> E{WbrZ ½bmBH$m b, HOCH 2 CH 2 OH, AmnH$s H$ma H$s ervbz àumbr _ S>mbm OmVm h & `{X Ob-½bmBH$m b {db`z H$m {h_m H$ C hmo, Vmo {db`z H$m ŠdWZm H$ Š`m hmojm? (Ob Ho$ {be K b = K kg mol 1 Am a K f = K kg mol 1 ) 3 Some ethylene glycol, HOCH 2 CH 2 OH, is added to your car s cooling system along with 5 kg of water. If the freezing point of water-glycol solution is C, what is the boiling point of the solution? (K b = K kg mol 1 and K f = K kg mol 1 for water) 21. H$m na H$m KZËd g cm 3 h & BgHo$ {H«$ñQ>b H$s \$bh$ Ho$pÝÐV KZr` g amzm hmovr h & H$m na na_muw H$s {ÌÁ`m Š`m h? (na_muw Ðì`_mZ Cu = g mol 1, N A = mol 1 ) 3 The density of copper is g cm 3. It has a face centred cubic structure. What is the radius of copper atom? (Atomic mass Cu = g mol 1, N A = mol 1 ) 22. {ZåZ nxm H$s n[a^mfm Xr{OE : 3 emofu {Q>ÊS>b à^md BboŠQ >mo\$moao{gg 56/1/2 6
7 Define the following terms : Sorption Tyndall effect Electrophoresis 23. {ZåZ H$mo H$maU XoVo hþe g_pmbe : 3 Eo{ZbrZ \«$rs>ob-h«$mâq>²g A{^{H«$`m Zht XoVm h & E{WbEo_rZ Ob _ KwbZerb h naývw Eo{ZbrZ Zht & _o{wbeo_rz Ho$ pk b H$m _mz Eo{ZbrZ Ho$ pk b _mz go H$_ h & Account for the following : Aniline does not give Friedel-Crafts reaction. Ethylamine is soluble in water whereas aniline is not. pk b of methylamine is less than that of aniline. 24. (a) {ZåZ `w½_m _o go H$m Z-gm `m {JH$ OH g_yh YmaH$ `m {JH$ Ho$ gmw S N 2 A{^{H«$`m H$aZo _ A{YH$ VoOr go A{^{H«$`m H$aoJm? CH 3 Br `m CH 3 I (CH 3 ) 3 CCl `m CH 3 Cl (b) {ZåZ A{^{H«$`mAm Ho$ CËnmX {b{ie : (a) Which compound in each of the following pairs will react faster in S N 2 reaction with OH group? 3 CH 3 Br or CH 3 I (CH 3 ) 3 CCl or CH 3 Cl (b) Write the product of the following reactions : 56/1/2 7 P.T.O.
8 25. {ZåZ H$m åßbošgm _ go àë`oh$ H$m AmB.`y.nr.E.gr. (IUPAC) Zm_ {b{ie : 3 [Co(NH 3 ) 5 Cl]Cl 2 K 3 [Fe(CN) 6 ] [NiCl 4 ] 2 AWdm {ZåZ H$m åßbošg Am`Zm _ go àë`oh$ Ho$ àh$m{eh$ g_md`{d`m H$s g amzme± Amao{IV H$s{OE : [Cr(C 2 O 4 ) 3 ] 3, [PtCl 2 (en) 2 ] 2+, [Cr(NH 3 ) 2 Cl 2 (en)] + Write down the IUPAC name for each of the following complexes : [Co(NH 3 ) 5 Cl]Cl 2 K 3 [Fe(CN) 6 ] [NiCl 4 ] 2 OR Draw the structures of optical isomers of each of the following complex ions : [Cr(C 2 O 4 ) 3 ] 3, [PtCl 2 (en) 2 ] 2+, [Cr(NH 3 ) 2 Cl 2 (en)] {ZåZ{b{IV Š`m h? àë`oh$ H$m EH$-EH$ CXmhaU Xr{OE & 3 _YwaH$mar H$_ H$ (ñdrq>oqzj EOoÝQ>) ImÚ n[aajh$ à{vo {dh$ What are the following? Give one example of each. Sweetening agents Food preservatives Antibiotics 56/1/2 8
9 27. {ZåZ ~hþbh$m Ho$ EH$bH$m Ho$ Zm_ Xr{OE : 3 {ZAmoàrZ nm {bñq>mbarz nm {bàmonrz Give names of the monomers of the following polymers : Neoprene Polystyrene Polypropene 28. (a) EH$ {dúwv²-ankq²>` Ho$ {db`z Ho$ {be MmbH$Vm Am a _moba MmbH$Vm nxm H$mo n[a^m{fv H$s{OE & Vmn_mZ ~XbZo Ho$ gmw CZHo$ n[adv Z na {Q>ßnUr H$s{OE & (b) EH$ MmbH$Vm gob H$m _m{nv à{vamoy 100 ohm Wm & n[ah${bv H$s{OE {d{eï> MmbH$Vm Am a {db`z H$s _moba MmbH$Vm & (KCl = g mol 1 Am a gob pñwam H$ = cm 1 ) 2, 3 AWdm (a) {ZåZ{b{IV àë`oh$ _ {dúwv²-ankq>z Ho$ CËnmXm H$s àmjw{º$ H$s{OE : ßb {Q>Z_ BboŠQ >mos>m Ho$ gmw AgNO 3 H$m Obr` {db`z & ßb {Q>Z_ BboŠQ >mos>m Ho$ gmw H 2 SO 4 H$m Obr` {db`z & (b) (a) (b) Cg Ý`yZV_ {d^dm Va H$m AmH$bZ H$s{OE Omo 500 C na Al 2 O 3 H$m AnM`Z H$aZo Ho$ {be Amdí`H$ h & AnKQ>Z A{^{H«$`m 3 2 Al2 O Al + O2 Ho$ {be {JãµO D$Om n[adv Z h 960 kj & (F = C mol 1 ) Define the terms conductivity and molar conductivity for the solution of an electrolyte. Comment on their variation with temperature. The measured resistance of a conductance cell was 100 ohms. Calculate the specific conductance and the molar conductance of the solution. (KCl = g mol 1 and cell constant = cm 1 ) OR 56/1/2 9 P.T.O.
10 (a) Predict the products of electrolysis in each of the following : An aqueous solution of AgNO 3 with platinum electrodes. An aqueous solution of H 2 SO 4 with platinum electrodes. (b) Estimate the minimum potential difference needed to reduce Al 2 O 3 at 500 C. The Gibbs energy change for the decomposition reaction 2 4 Al2 O 3 Al + O2 is 960 kj. (F = C mol 1 ) (a) {ZåZ H$m du Z H$s{OE : EoëS>mob g KZZ H ${ÞµOmamo A{^{H«$`m (b) {ZåZ `w½_m _ A Va H$aZo Ho$ {be amgm`{zh$ Om±M H$m du Z H$s{OE : EW Z b Am a àmon Z b ~oýµo pës>hmbs> Am a EogrQ>mo\$sZmoZ àmonoz-2-amoz Am a àmonoz-3-amoz 2, 3 AWdm (a) {ZåZ `m {JH$m H$s g amzme± Amao{IV H$s{OE : 4-ŠbmoamonoÝQ>oZ-2-AmoZ ã`yq>-2-b Z-1-Ab (b) {ZåZ{b{IV _ CËnmX {b{ie : (a) Describe : Aldol condensation Cannizzaro reaction 56/1/2 10
11 (b) Describe a chemical test to distinguish between Ethanal and Propanal Benzaldehyde and Acetophenone Propan-2-one and Propan-3-one OR (a) Draw the structures of the following compounds : 4-chloropentan-2-one But-2-en-1-al (b) Write the product(s) in the following : 30. (a) {ZåZ amgm`{zh$ g_rh$aum H$mo nyam H$s{OE : P 4 + NaOH + H 2 O XeF 4 + O 2 F 2 (b) {ZåZ pñw{v`m H$mo Amn H $go C{MV R>hamE±Jo : BZ `m {JH$m _ Aåbr` gm_ï` {ZåZ H«$ ~ T>Vm h : PH 3 < H 2 S < HCl ŠbmoarZ Ho$ Am ŠgmoAåbm H$s Am ŠgrH$maH$ j_vm H$m H«$_ {ZåZ h : HClO 4 < HClO 3 < HClO 2 < HClO dmîn AdñWm _ gë\$a AZwMwå~H$s` ì`dhma àx{e V H$aVm h & 2, 3 (a) AWdm dr.eg.b.nr.ama. (VSEPR) {gõmýv H$m Cn`moJ H$aVo hþe {ZåZ H$s gå^m{dv g amzmam H$s àmjw{º$ H$s{OE : N 2 O 3 BrF 3 56/1/2 11 P.T.O.
12 (b) nxmwm] Ho$ {ZåZ g_yhm H$mo àë`oh$ g_yh Ho$ AmJo {XE JE JwUY_ Ho$ H«$ ì`dpñwv H$s{OE : NH 3, PH 3, AsH 3, SbH 3 ~ T>Vo hþe ŠdWZm H$ _mzm Ho$ H«$ O, S, Se, Te G$UmË_H$ {M Ho$ gmw BboŠQ >m Z bpãy EÝW ënr Ho$ ~ T>Vo H«$ F 2, Cl 2, Br 2, I 2 Am~ÝY {d`mooz EÝW ënr Ho$ ~ T>Vo H«$ (a) Complete the following chemical equations : P 4 + NaOH + H 2 O XeF 4 + O 2 F 2 (b) How would you account for the following situations? (a) The acidic strength of these compounds increases in the following order : PH 3 < H 2 S < HCl The oxidising power of oxoacids of chlorine follows the order : HClO 4 < HClO 3 < HClO 2 < HClO In vapour state sulphur exhibits paramagnetic behaviour. OR Using VSEPR theory predict the probable structures of the following : N 2 O 3 (b) BrF 3 Arrange the following groups of substances in the order of the property indicated against each group : NH 3, PH 3, AsH 3, SbH 3 increasing order of boiling points. O, S, Se, Te increasing order of electron gain enthalpy with negative sign. F 2, Cl 2, Br 2, I 2 increasing order of bond dissociation enthalpy. 56/1/2 12
agm`z {dkmz (g ÕmpÝVH$) {ZYm [av g_` : 3 KÊQ>o A{YH$V_ A H$ : 70 Series OSR/1/C H$moS> Z. 56/1/1
Series OSR/1/C H$moS> Z. 56/1/1 amob Z. Roll No. Code No. narjmwu H$moS >H$mo CÎma-nwpñVH$m Ho$ _wi-n ð >na Adí` {bio & Candidates must write the Code on the title page of the answer-book. H $n`m Om±M
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Series SGN amob Z. Roll No. H$moS> Z. Code No. SET-3 56/3 narjmwu H$moS >H$mo CÎma-nwpñVH$m Ho$ _wi-n ð >na Adí` {bio & Candidates must write the Code on the title page of the answer-book. H $n`m Om±M
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