SAMPLE PAPERS SET - I

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SAMPLE PAPERS SET - I XII - CHEMISTRY SCORING KEY 1. 3- hydroxybutanoic acid and 3-hydroxy pentanoic acid ( 1) 2. CH 3 CH 2 Cl + aq.naoh CH 3 CH 2 OH + NaCl 3. 4. Ferrimagnetic Substance 5. ( 1) 6.

1 SAMPLE PAPERS SET - I XII - CHEMISTRY SCORING KEY hydroxybutanoic acid and 3-hydroxy pentanoic acid ( 1) 2. CH 3 CH 2 Cl + aq.naoh CH 3 CH 2 OH + NaCl Ferrimagnetic Substance 5. ( 1) 6. AlCl 3. Smaller the coagulating value, greater is the coagulating power 7. λ m C 8. By increasing P H or supplying basic medium 9. Balanced chemical equation (1+1) 10. a)ch 3 CH 2 CH 2 CH 2 Br < CH 3 CH 2 CH(Br)CH 3 < CH 3 CH (CH 3 ) CH(Br)CH 3 < (CH 3 ) 3 C Br Structure Arrangement 11. a) Increase in acidity is due to I effect of - NO 2 group and in 2-nitrophenol (electron with drawing - effect of -NO 2 ) b) Inter molecular Hydrogen bonding in ethyl alcohol increases B.P which is not in diethyl ether. 12. a) Unit of K= mol 1-n l n-1 s -1 = mol 1-3/4 l 3/4-1 s -1 = mol 1/4 l -1/4 s -1 b) One

2 2-13. Pb + SO 4 PbSO 4 + 2e anode reaction 2- PbO 2 + SO 4 + 4H + + 2e PbSO 4 + 2H 2 O - cathode reaction 14. a) La(OH) 3 is a stronger base, due to lanthanoid contraction b) Zn 2+ - [Ar]3d 10, Cu 2+ - [Ar] 3d 9 Due to the presence of completely filled configuration 2n 2+ salts are colourless and due to unpaired electron in 3d make Cu 2+ coloured. 15. E cell = E [ P] cell log n [ R] [ Zn ] = 1.56V - log [ Ag ] 0.1 =1.56V log 4 2 (1x10 ) = 1.56V X 7 = 1.56V = V 16. a) Novolac is a linear polymer of phenol and formaldehyde but Bakelite is a cross linked polymer or structure. b) Buna-S is addition polymer, Terylene is a condensation polymer. Or a) Copolymers are formed by the polymerization of two or more different monomers. ( 1) b) Rubber < Polythene < Nylon 6 ( 1) 17. a) CH 3 NH 2 + HOH CH 3 NH OH - FeCl 3 + 3OH - Fe(OH) 3 + 3Cl - c) Aniline reacts with Nitric acid to give Anilinium ion which is meta directing. 18. Method of preparation of sulphanilic acid Structure of zwitter ion ( 1) 19. a)definition. CetylTrimethyl ammonium bromide. It is used in hair conditioners. Or any one example ( ½ + ½) b)medicine used to decrease mental strain Example (½ + ½) c)chemicals used to sweeten food material. Example (½ + ½) 20. a)zno Zn 2+ + ½ O 2 + 2e or Correct answer b)d=zm/n a 3 ( ½) a 3 =4x197 gm /19.3gmcm -3 X 6.023x10 23 = 4.076x10-8 cm = 407.6pm ( ½) Answer with unit ( ½ + ½) 21) a)activated charcoal is a good adsorbent b)due to coagulation ( 1) c)tyndall effect ( 1) [OR]

3 a)combination of two layers of opposite charges around colloidal particle. ( 1) b)many particle which are not having the size of colloidal particle gather together ( 1) to form particles of colloidal size. ( 1) c)movement of the colloidal particles towards cathode or anode in presence of electricity. ( 1) 22. a)no. of collisions per second. ( 1) b) Formula - ( ½ ) substitution ( ½) Proof. ( 1) 23. a)linkage isomer [Co(NH 3 ) 5 ONO]SO 4 ( ½+1/2) Pentaamineo- nitritocobalt(iii)sulphate or correct name b)shape and Magnetic moment Explanations 24. a)in solid state PCl 5 exists as [PCl 4 ] + [PCl 5 ] - b)polarity is more for interhalogen, hence bond dissociation energy is less. c)fluorine and oxygen are more electronegative. NaBH 4 SOCl C 5 H 8 O [B] C NaBH 4 SOCl 2 CH 3 C CH 2 CH 3 CH 3 CHCH 2 CH 3 CH 3 CHCH 2 CH 3 ( ½+½+1/2) O OH Cl [A] [B] [C] A=2-butanone ( ½) B=2-butanol ( ½) C=2-Chloro butane ( ½) 26. a) Iodine combines with Titanium form volatile TiI 4 or Ti + 2 I 2 TiI 4 b)to decrease m.p of alumina and to increase conductivity (½ + ½) c) NaCN act as a depressant. 27. a)definition b)any two function ( ½ + ½) c)α-helix intra molecular hydrogen bonding. (½ + ½) β-pleated-intra molecular hydrogen bonding.

4 Con.NaOH 28 i a) 2HCHO H-COONa + CH 3 OH or any other example. X 2 /P b) R-CH 2 -COOH R-CHX-COOH or any other example. Ca(OH) 2 heat ii) a) CH 3 COOH (CH 3 COO) 2 Ca - CH 3 -CO-CH 3 -CaCO 3 HCN H 2 O/H + b) CH 3 -CHO CH 3 -CH (CN )OH CH 3 -CH(OH)-COOH iii) Correct mechanism showing the polarization of Carbonyl group and addition of grignard s reagent Or i) a) R-COCl +[H] Pd/BaSO 4 R-CHO + HCl or any other example. Sulphur dil.naoh b) CH 3 -CHO CH 3 -CH( OH)CH 2 -CHO ii) a) Propanone on treating with I 2 and NaOH give yellow precipitate of CHI 3 but not 1-propanol or any other distinction like lucas test or2,4-dnp b) Phenol gives violet colour with FeCl 3 and not benzoic acid or any other difference. iii) Ketones on treating with NaHSO 3 to give adduct which on hydrolysis gives back Ketones. Or correct equation. 29. a) 3Cl 2 + 6NaOH NaClO 3 +5NaCl+3H 2 O b)4 XeF 2 +2H 2 O 4 Xe+4 HF+O 2 c)a=o 2 B=O 3 (½+½) PbS +4 O 3 PbSO 4 +4 O 2 2 I - +H 2 O+O 3 2 OH - + I 2 + O 2 OR - a)no 3 + H 2 SO 4 2- HNO 3 +SO 4 4 HNO 3 4 NO 2 +O 2 +2 H 2 O Cu+4 HNO 3 Cu(NO 3 ) 2 +2NO 2 +2H 2 O b)clf 3 is T-shaped structure c)correct Structure

5 30. a)definition b)graph c)formation if K 2 HgI 4, decreases the number of particles ΔP=less, V P high d) π V= W B RT M B = 1.26gm x lit atm k -1 mol -1 x 300 k 2.57x10-3 atm x 0.2 L = gm/mol -1 (½+½) [OR] a)statement b)v.p less solution of nonvolatile hence high B P c)graph d) Formula Substitution with unit Answer with unit = 230gmmol -1

SAMPLE PAPER-1 Q 1. Q 2. Q 3. Write IUPAC name of: C 6H 5 NHCOCH 3 1. Q 4. What is Kraft temperature? 1

SAMPLE PAPER-1 Q 1. Q 2. Q 3. Write IUPAC name of: C 6H 5 NHCOCH 3 1. Q 4. What is Kraft temperature? 1 Q. Q. SAMPLE PAPER- Class-XII Sub-Chemistry Time : hrs. M.M.70 Instructions:-. All Questions are compulsory. Question No to 8 are very short answer questions carrying mark each.. Question No 9 to 8 are