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CBSE Class 12 Board Exam 2017 : Chemistry

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SET-1 H$moS> Z . Series GBM Code No. amob Z . 56/1 narjmWu H$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 _| >26 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 26 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 56/1 Maximum Marks : 70 1 P.T.O. gm_m ` {ZX}e : (i) g^r Z A{Zdm` h & (ii) Z g `m 1 go 5 VH$ A{V bKw-C mar` Z h Am a `oH$ Z Ho$ {bE 1 A H$ h & (iii) Z g `m 6 go 10 VH$ bKw-C mar` Z h Am a `oH$ Z Ho$ {bE 2 A H$ h & (iv) Z g `m 11 go 22 VH$ ^r bKw-C mar` Z h Am a `oH$ Z Ho$ {bE 3 A H$ h & (v) Z g `m 23 _y `mYm[aV Z h Am a BgHo$ {bE 4 A H$ h & (vi) Z g `m 24 go 26 VH$ XrK -C mar` Z h Am a `oH$ Z Ho$ {bE 5 A H$ h & (vii) `{X Amd `H$Vm hmo, Vmo bm J Q>o~bm| H$m `moJ H$a| & H $ Hw$boQ>am| Ho$ Cn`moJ H$s AZw_{V Zht h & General Instructions : (i) All questions are compulsory. (ii) Questions number 1 to 5 are very short answer questions and carry 1 mark each. (iii) Questions number 6 to 10 are short answer questions and carry 2 marks each. (iv) Questions number 11 to 22 are also short answer questions and carry 3 marks each. (v) Question number 23 is a value based question and carries 4 marks. (vi) Questions number 24 to 26 are long answer questions and carry 5 marks each. (vii) Use log tables, if necessary. Use of calculators is not allowed. 1. gm HNO3 mam P4 H$m Am grH$aU H$aZo na Omo \$m \$moag H$m `m {JH$ m V hmoVm h , CgH$m gy {b{IE & 1 Write the formula of the compound of phosphorus which is obtained when conc. HNO3 oxidises P4. 2. {Z Z{b{IV `m {JH$ H$m AmB .`y.nr.E.gr. Zm_ {b{IE H3C C = C CH2 OH | | CH3 Br 56/1 2 : 1 Write the IUPAC name of the following compound : H3C C = C CH2 OH | | CH3 Br 3. (a) g{H $`U D$Om (Ea), Am a (b) A{^{H $`m H$s {J O D$Om ( G) na C oaH$ H$s Cnp W{V H$m `m ^md n S>Vm h ? 1 What is the effect of adding a catalyst on (a) Activation energy (Ea), and (b) Gibbs energy ( G) of a reaction ? 4. Out of 5. _| go H$m Z-gm Eo{b{bH$ h bmBS> H$m CXmhaU h Am a and ? 1 , which is an example of allylic halide ? O~ d H$mo R>mog _| n[a{j V {H$`m OmVm h , Vmo {H$g H$ma H$m H$mobm BS> ~ZVm h ? EH$ CXmhaU Xr{OE & 1 What type of colloid is formed when a liquid is dispersed in a solid ? Give an example. 6. (a) {Z Z{b{IV `m {JH$m| H$mo CZHo$ A b gm_ ` Ho$ ~ T>Vo h E H $_ _| `dp WV H$s{OE : p-H $sgm b, p-ZmBQ >mo \$sZm b, \$sZm b (b) {Z Z{b{IV A{^{H $`m H$s (Kw_mdXma Vra A H$Z H$m Cn`moJ H$aVo h E) {H $`m{d{Y {b{IE : CH2 CH2 H 3O CH3 CH2 + H2O 1+1=2 AWdm 56/1 3 P.T.O. `yQ>oZ-2-Am b H$s {Z Z{b{IV Ho$ gmW A{^{H $`m go ~ZZo dmbo C nmXm| H$s g aMZmE {b{IE : 1+1=2 (a) CrO3 (b) SOCl2 (a) Arrange the following compounds in the increasing order of their acid strength : p-cresol, p-nitrophenol, phenol (b) Write the mechanism (using curved arrow notation) of the following reaction : CH2 CH2 H 3O CH3 CH2 + H2O OR Write the structures of the products when Butan-2-ol reacts with the following : 7. (a) CrO3 (b) SOCl2 Eobw{_{Z`_ Ho$ 8 1 g _| {H$VZr EH$H$ H$mop R>H$mE hm|Jr `{X `h \$bH$-Ho$p V KZr` (E\$.gr.gr.) g aMZm _| {H $ Q>brH $V hmoVm h ? (Al H$m na_mUw `_mZ = 27 g mol 1) 2 Calculate the number of unit cells in 8 1 g of aluminium if it crystallizes in a face-centred cubic (f.c.c.) structure. (Atomic mass of Al = 27 g mol 1) 8. {Z Z{b{IV H$s g aMZmE Amao{IV H$s{OE (a) H2SO3 (b) HClO3 : 2 Draw the structures of the following : 56/1 (a) H2SO3 (b) HClO3 4 9. Cg gob H$m Zm_ {b{IE {Ogo gm_m `V: ldU ` m| (ghm`m|) _| `w $ {H$`m OmVm h & Bg gob Ho$ EoZmoS> VWm H $WmoS> na hmoZo dmbr A{^{H $`mAm| H$mo {b{IE & 2 Write the name of the cell which is generally used in hearing aids. Write the reactions taking place at the anode and the cathode of this cell. 10. AmB .`y.nr.E.gr. _mZH$m| H$m `moJ H$aVo h E {Z Z{b{IV Ho$ {bE gy {b{IE (a) gmo{S>`_ S>mBgm`{ZS>moAm aoQ(I) (b) Q>oQ >mEo _rZ bmo[aS>moZmB{Q >Q>mo-N- b {Q>Z_(IV) g \o$Q> : 1+1=2 Using IUPAC norms write the formulae for the following : 11. (a) Sodium dicyanidoaurate(I) (b) Tetraamminechloridonitrito-N-platinum(IV) sulphate (a) A VamAmp dH$ ~bm| H$s H ${V Ho$ AmYma na {Z Z{b{IV R>mogm| H$mo dJuH $V H$s{OE : {g{bH$Z H$m~m BS>, Am J Z J_ H$aZo na ZnO nrbm hmo OmVm h & `m| ? dJ 12-16 `m {JH$m| go `m A{^ m` h ? EH$ CXmhaU Xr{OE & (b) (c) (a) 3 Based on the nature of intermolecular forces, classify the following solids : Silicon carbide, Argon 12. (b) ZnO turns yellow on heating. Why ? (c) What is meant by groups 12-16 compounds ? Give an example. (a) EH$ gob {Og_| {Z Z{b{IV A{^{H $`m hmoVr h : 2 Fe2+ (aq) + I2 (s) 2 Fe3+ (aq) + 2 I (aq) H$m 298 K Vmn na E gob = 0.236 V n[aH${bV H$s{OE & ({X`m J`m h (b) 56/1 h & gob A{^{H $`m H$s _mZH$ {J O D$Om : 1 F = 96,500 C mol 1) `{X EH$ Ymp dH$ Vma _| 0 5 Eop n`a H$s Ymam 2 K Q>m| Ho$ {bE dm{hV hmoVr h , Vmo Vma _| go {H$VZo Bbo Q >m Z dm{hV hm|Jo ? ({X`m J`m h : 1 F = 96,500 C mol 1) 5 3 P.T.O. (a) The cell in which the following reaction occurs : 2 Fe3+ (aq) + 2 I (aq) 2 Fe2+ (aq) + I2 (s) has E cell = 0 236 V at 298 K. Calculate the standard Gibbs energy of the cell reaction. (Given : 1 F = 96,500 C mol 1) (b) How many electrons flow through a metallic wire if a current of 0 5 A is passed for 2 hours ? (Given : 1 F = 96,500 C mol 1) 13. 14. [Co(NH3)5 (SCN)]2+ {H$g (a) g H$a (b) [NiCl4]2 AZwMw ~H$s` (c) {Z Z MH $U MVw \$bH$s` g Hw$b `m| {dabo hr XoIo OmVo h (a) What type of isomerism [Co(NH3)5 (SCN)]2+ ? (b) Why is [NiCl4]2 paramagnetic while [Ni(CN)4]2 is diamagnetic ? (Atomic number of Ni = 28) (c) Why are low spin tetrahedral complexes rarely observed ? h O~{H$ (Ni H$m na_mUw H $_m H$ = 28) H$ma H$s g_md`dVm {XImVm h [Ni(CN)4]2 is (a) ~h Amp dH$ H$mobm BS> Am a ghMmar H$mobm BS> (b) H $XZ Am a no Q>Z (no Q>mB OoeZ) (c) g_m Jr C oaU Am a {df_m Jr C oaU {VMw ~H$s` h & `m| shown {Z Z{b{IV _| go `oH$ Ho$ ~rM EH$-EH$ A Va {b{IE ? ? ? by 1 3=3 the complex : 1 3=3 AWdm 56/1 (a) X Y H$s n[a{j V md Wm Am a n[ajonU _m `_ {b{IE & (b) ^m {VH$ A{YemofU Am a amgm`{ZH$ A{YemofU Ho$ ~rM EH$ g_mZVm {b{IE & (c) FeCl3 go Fe(OH)3 gm b H$mo ~ZmZo dmbr amgm`{ZH$ {d{Y H$m Zm_ {b{IE & 6 1 3=3 Write one difference in each of the following : (a) Multimolecular colloid and Associated colloid (b) Coagulation and Peptization (c) Homogeneous catalysis and Heterogeneous catalysis OR 15. (a) Write the dispersed phase and dispersion medium of milk. (b) Write one similarity between physisorption and chemisorption. (c) Write the chemical method by which Fe(OH)3 sol is prepared from FeCl3. 25% {d`moOZ Ho$ {bE EH$ W_ H$mo{Q> H$s A{^{H $`m 20 {_ZQ> boVr h & A{^{H $`m H$mo 75% nyam H$aZo _| Omo g_` bJoJm, CgH$s JUZm H$s{OE & ({X`m J`m h : log 2 = 0 3010, log 3 = 0 4771, log 4 = 0 6021) 3 A first order reaction takes 20 minutes for 25% decomposition. Calculate the time when 75% of the reaction will be completed. (Given : log 2 = 0 3010, log 3 = 0 4771, log 4 = 0 6021) 16. AmnH$mo {Z Z{b{IV `m {JH$ {XE JE h : 2-~ mo_mono Q>oZ, 2-~ mo_mo-2-_o{Wb `yQ>oZ, 1-~ mo_mono Q>oZ (a) SN2 A{^{H $`m _| g~go A{YH$ A{^{H $`merb `m {JH$ H$m Zm_ {b{IE & (b) (c) Y wdU KyU H$ `m {JH$ H$m Zm_ {b{IE & -{dbmonZ A{^{H $`m _| g~go A{YH$ A{^{H $`merb `m {JH$ H$m Zm_ {b{IE & 1 3=3 The following compounds are given to you : 2-Bromopentane, 2-Bromo-2-methylbutane, 1-Bromopentane 56/1 (a) Write the compound which is most reactive towards SN2 reaction. (b) Write the compound which is optically active. (c) Write the compound which is most reactive towards -elimination reaction. 7 P.T.O. 17. {Z Z{b{IV Ho$ {g m V {b{IE (a) _ S>b n[a H$aU (b) \o$Z bdZ {d{Y (c) dU bo{IH$s : 1 3=3 Write the principle of the following : (a) (b) (c) 18. Zone refining Froth floatation process Chromatography {Z Z{b{IV A{^{H $`mAm| _| A, B VWm C `m {JH$m| H$s g aMZmE {b{IE : 1 1 2=3 2 Write the structures of compounds A, B and C in the following reactions : 19. {Z Z{b{IV ~h bH$m| H$mo m V H$aZo Ho$ {bE `w $ EH$bH$m| H$s g aMZmE {b{IE : (a) ZmBbm Z-6,6 (b) _ob _mBZ-\$m _}p S>hmBS> ~h bH$ (c) `yZm-S 1 3=3 Write the structures of the monomers used for getting the following polymers : 56/1 (a) (b) Nylon-6,6 Melamine-formaldehyde polymer (c) Buna-S 8 20. {Z Z{b{IV H$mo n[a^m{fV H$s{OE (a) G$Um`Zr An_mO H$ (b) gr{_V no Q >_ {VO {dH$ (c) ny{VamoYr : 1 3=3 Define the following : 21. (a) Anionic detergents (b) Limited spectrum antibiotics (c) Antiseptics {Z Z{b{IV Ho$ H$maU ~VmBE : (a) bmb \$m \$moag, doV \$m \$moag H$s VwbZm _| H$_ A{^{H $`merb hmoVm h & (b) h bmoOZm| H$s Bbo Q >m Z bp Y E W p n`m A{YH$V_ G$Um _H$ hmoVr h & (c) N2O5 , N2O3 H$s Anojm A{YH$ A br` h & 1 3=3 Give reasons for the following : 22. (a) Red phosphorus is less reactive than white phosphorus. (b) Electron gain enthalpies of halogens are largely negative. (c) N2O5 is more acidic than N2O3. {Z Z{b{IV Ho$ H$maU ~VmBE : (a) Eo{ZbrZ H$m Eogr{Q>brH$aU BgH$m g{H $`U ^md H$_ H$aVm h & (b) CH3NH2 , C6H5NH2 H$s VwbZm _| A{YH$ jmar` hmoVm h & (c) 1 3=3 ` {n NH2 g_yh o/p {ZX}eH$ hmoVm h , {\$a ^r Eo{ZbrZ ZmBQ >moH$aU mam `Wo Q> _m m _| m-ZmBQ >moE{o ZbrZ XoVr h & Give reasons for the following : (a) Acetylation of aniline reduces its activation effect. (b) CH3NH2 is more basic than C6H5NH2. (c) Although NH2 is o/p directing group, yet aniline on nitration gives a significant amount of m-nitroaniline. 56/1 9 P.T.O. 23. Q>r.dr. _| EH$ moJ m_ _| ~ oS> VWm X gao ~oH$ar C nmXm| _| nmoQ> {e`_ ~ mo_oQ> Am a nmoQ> {e`_ Am`moS>oQ> O go H $ gaOZ (H $gaH$mar) agm`Zm| H$s Cnp W{V XoIZo Ho$ ~mX, $nmbr, ~mahdt H$jm H$s N>m m, Zo X gam| H$mo Im -nXmWm] _| BZ H $ gaOZ go hmoZo dmbo hm{ZH$a ^mdm| Ho$ ~mao _| OmJ V H$aZo H$m {Z M` {H$`m & dh Hy$b YmZmMm` go {_br Am a CZgo AmJ h {H$`m {H$ do H $ Q>rZ R>oHo$Xma H$mo AmXoe X| {H$ dh {d m{W `m| H$mo g S>{dM, {n Om, ~J a Am a X gao ~oH$ar C nmX Z ~oM| & YmZmMm` Zo V H$mb H$X_ CR>mVo h E H $ Q>rZ R>oHo$Xma H$mo ~oH$ar C nmXm| H$s OJh Hw$N> moQ>rZ Ed {dQ>m{_Z go ^anya Im -nXmW O go \$b, gbmX, A Hw$[aV nXmW aIZo H$m AmXoe {X`m & Bg {ZU ` H$m g^r _mVm-{nVm VWm {d m{W `m| Zo dmJV {H$`m & Cn`w $ n[a N>oX H$mo n T>Zo Ho$ ~mX, {Z Z{b{IV Zm| Ho$ C ma Xr{OE : (a) $nmbr mam {H$Z _y `m| (H$_-go-H$_ Xmo) H$mo Xem `m J`m h ? (b) Am_Vm a go ~ oS> _| H$m~m}hmBS >oQ >g H$m H$m Z-gm nm {bg Ho$amBS> KQ>H$ Cnp WV hmoVm h (c) moQ>rZm| H$s { Vr`H$ g aMZm Ho$ Xmo H$ma {b{IE & (d) Ob {dbo` {dQ>m{_Zm| Ho$ Xmo CXmhaU Xr{OE & 4 ? After watching a programme on TV about the presence of carcinogens (cancer causing agents) Potassium bromate and Potassium iodate in bread and other bakery products, Rupali a Class XII student decided to make others aware about the adverse effects of these carcinogens in foods. She consulted the school principal and requested him to instruct the canteen contractor to stop selling sandwiches, pizzas, burgers and other bakery products to the students. The principal took an immediate action and instructed the canteen contractor to replace the bakery products with some protein and vitamin rich food like fruits, salads, sprouts, etc. The decision was welcomed by the parents and the students. After reading the above passage, answer the following questions : 56/1 (a) What are the values (at least two) displayed by Rupali ? (b) Which polysaccharide component of carbohydrates is commonly present in bread ? (c) Write the two types of secondary structures of proteins. (d) Give two examples of water soluble vitamins. 10 24. (a) (b) {Z Z{b{IV Ho$ H$maU Xr{OE : (i) g H $_U YmVwE n[adV Zr` Am grH$aU Ad WmE Xem Vr h & (ii) Zn, Cd Am a Hg Z_ (iii) Mn3+/Mn2+ (_ X ) YmVwE h & `w _ Ho$ {bE E H$m _mZ A{YH$ YZm _H$ (+ 1 57 V) hmoVm h & Cr3+/Cr2+ H$s VwbZm _| ~h V b WoZm `S> Am a Eop Q>Zm `S> V dm| Ho$ agm`Z Ho$ ~rM EH$ g_mZVm Am a EH$ A Va {b{IE & 3+2=5 AWdm (a) {Z Z{b{IV 3d loUr Ho$ g H $_U YmVwAm| Ho$ Am`Z h : Ti4+, V2+, Mn3+, Cr3+ (na_mUw H $_m H$ : Ti = 22, V= 23, Mn = 25, Cr = 24) {Z Z{b{IV Ho$ C ma Xr{OE : (b) (a) (i) H$m Z-gm Am`Z Obr` {db`Z _| g~go A{YH$ Wm`r h Am a `m| (ii) H$m Z-gm Am`Z ~b Am grH$maH$ h Am a `m| (iii) H$m Z-gm Am`Z a JhrZ h Am a `m| {Z Z{b{IV g_rH$aUm| H$mo nyam H$s{OE ? ? ? : (i) 2 MnO 4 + 16 H+ + 5 S2 (ii) KMnO4 D$ _m 3+2=5 Account for the following : (i) Transition metals show variable oxidation states. (ii) Zn, Cd and Hg are soft metals. (iii) E value for the Mn3+/Mn2+ couple is highly positive (+ 1 57 V) as compared to Cr3+/Cr2+. 56/1 11 P.T.O. (b) Write one similarity and one difference between the chemistry of lanthanoid and actinoid elements. OR (a) Following are the transition metal ions of 3d series : Ti4+, V2+, Mn3+, Cr3+ (Atomic numbers : Ti = 22, V = 23, Mn = 25, Cr = 24) Answer the following : (b) 25. (i) Which ion is most stable in an aqueous solution and why ? (ii) Which ion is a strong oxidising agent and why ? (iii) Which ion is colourless and why ? Complete the following equations : (i) 2 MnO 4 + 16 H+ + 5 S2 (ii) heat KMnO4 (a) gyH $mog Ho$ 10% ( `_mZ _|) Obr` {db`Z H$m {h_m H$ 269 15 K h & `{X ew Ob H$m {h_m H$ 273 15 K h , Vmo byH$mog Ho$ 10% Obr` {db`Z Ho$ {h_m H$ H$s JUZm H$s{OE & {X`m J`m h : (gyH $mog H$m _moba `_mZ = 342 g mol 1) ( byH$mog H$m _moba `_mZ = 180 g mol 1) (b) {Z Z{b{IV nXm| H$mo n[a^m{fV H$s{OE (i) _mobbVm (m) (ii) Agm_m ` _moba `_mZ AWdm 56/1 12 : 3+2=5 (a) (b) (a) `y[a`m (M = 60 g mol 1) H$mo 846 g Ob _| Kmobm OmVm h & `{X 298 K na ew Ob H$m dm n Xm~ 23 8 mm Hg h , Vmo Bg {db`Z Ho$ {bE Ob Ho$ dm n Xm~ H$m n[aH$bZ H$s{OE & AmXe {db`Z Am a AZmXe {db`Z Ho$ ~rM Xmo A Va {b{IE & 3+2=5 30 g A 10% solution (by mass) of sucrose in water has a freezing point of 269 15 K. Calculate the freezing point of 10% glucose in water if the freezing point of pure water is 273 15 K. Given : (Molar mass of sucrose = 342 g mol 1) (Molar mass of glucose = 180 g mol 1) (b) Define the following terms : (i) Molality (m) (ii) Abnormal molar mass OR 26. 56/1 (a) 30 g of urea (M = 60 g mol 1) is dissolved in 846 g of water. Calculate the vapour pressure of water for this solution if vapour pressure of pure water at 298 K is 23 8 mm Hg. (b) Write two differences between ideal solutions and non-ideal solutions. (a) >{Z Z{b{IV A{^{H $`mAm| Ho$ C nmXm| H$mo {b{IE 13 : P.T.O. (b) {Z Z{b{IV `m {JH$ `wJbm| _| {d^oX H$aZo Ho$ {bE gab amgm`{ZH$ narjU Xr{OE : (i) `yQ>oZ b Am a `yQ>oZ-2-Am Z (ii) ~o OmoBH$ A b Am a \$sZm b 3+2=5 AWdm (a) {Z Z{b{IV _| hmoZo dmbr A{^{H $`mAm| H$mo {b{IE (i) B Q>mS> A{^{H $`m (ii) Q>r\o$Z AnM`Z (b) {Z Z{b{IV H$mo Amn A{YH$V_ Xmo MaUm| _| {H$g H$ma $nm V[aV H$a|Jo (i) ~o OmoBH$ A b go ~o O p S>hmBS> (ii) EogrQ>mo\$sZmoZ go ~o OmoBH$ A b (iii) EWoZm BH$ A b go 2-hmBS >m grEWoZm BH$ A b : 2+3=5 (a) Write the product(s) in the following reactions : (b) Give simple chemical tests to distinguish between the following pairs of compounds : (i) Butanal and Butan-2-one (ii) Benzoic acid and Phenol OR 56/1 : 14 (a) (b) 56/1 Write the reactions involved in the following : (i) Etard reaction (ii) Stephen reduction How will you convert the following in not more than two steps : (i) Benzoic acid to Benzaldehyde (ii) Acetophenone to Benzoic acid (iii) Ethanoic acid to 2-Hydroxyethanoic acid 15 P.T.O.

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