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" PRABODH Mobe Paper Ser-I | Chemistry (CG) : Class XII MM; tions : All Questions are Compulsory 1. Question no. | is objective question, which cantain two sections (i) Section (A) contain 10 multiple choice questions, (MCQ) Each carry 01 mark. (ii) Sections (B) contain 05 very short answer type questions. Each carry 01 mark. (Words limit - maximam 30 words) 2. Question no. 02 to Q. No O08 are short answer type (S.A-I) Question. Each carry 02 marks 3. Question no, 09 to Q. No. 14 are short answer type (S-A-lI) Questions. Each carry 03 marks. (Word limit-maximum 50 words) 4. Question no. 15 and 16 are Long answer type (LA-1) Questions, Each carry 04 marks, (Word limit-maximum 75-100 words) 5. Question no. 17 to Q. No, 19 are long answer type (LA-II) Questions, Each carry 05 marks (Word limit- maximam 100-150 words) Section ‘A’ 7. ive Type Questions 1. Choose the correct answer : Molarity of pure water is : fay 55-6 (b) 50 ic) 100 (d) 18. Unit of specific conductance is : (a) Ohm” (b) Ohm emt (c) Ohmem (d) Ohmem', Molecularity of a reaction cannot be : (1x10 = 10) fa) ] (b) 0 5 te) 05 (d) Both (b) and (c). ° To vhich block is Lanthanum related : {8) s-block (b) p-block (°)d- block (d) block. state of Ni im [Ni (CN)gF> is : (b) 3 10. (6. isa: Gem dihalide (b) Vie-dihalide sae Allylic halide (d) Vinylic halilde. CH,CH,OH—“"0 by the above reaction : (a) C,H—-O-C,H, (b) CH, = CH, (c) CH,CHO (d) CH,OH. Formalin is an aqueous solution of : (a) Formic acid (b) Formaldehyde (ec) Formy! chloride (d) Formamide, Among the following, explosive is : (a) Nitrobenzene is obtained (b) Nitrophenol “(c) Nitromethane (d) Trinitrobenzene. Which of the following base is not in DNA : (a) Adenine (b) Uracil (c) Thiamine (d) Cytosin, 1, (a), 2. (b), 3, (6), 4. (4), 5. (a), 6. (b), 7. (a), 8. (b), 9. (d), 10. (b). vivo Y2Oi 2026.02.24 20:30 vivo Y2Oi 2026.02.24 20:30 vivo Y2Oi 2026.02.24 20:30 vivo Y2Oi 2026.02.24 20:31 vivo Y2OiI 2026.02.24 20:51 PrasopH MoDE t PaPerR SEt-II Instructions : As before 9, Primary and secondary g| - a Section ‘A’ distinguished by : mines cay re Br/KOH (b) HCIO Objective Type Questions (a) J QL le correct answer : (1x10 = 10) (c) HNO, (d) NH,. 1. Number of moles of solute in 1000 gm solvent | 19, Sugar found in milk : is called : (a) Glucose (a) Normality (b) Molality (b) Lactose (c) Molarity (d) Mole fraction. (c) Maltose (d) Sucrose. 2. Relation which represents molar conduc- tance : a _Kx1000 a _Mx1000 fa) os 1 ae One wh, Sire 3. Correct form of Arrhenius equation is : (a) K=eF/RT (b) Kee ic) K=logete () K = Ae E/T, 4. atic block is Cu related : a) s-block p-block (c) d-block be z block... {oerdination numberof Fein K, [Re (CN) ~ faa Low (c)2 aid ’ 5 ne (a) Vie dihalide Ans. 1. (b), 2. (a), 3. (d), 4. (©), 5: (6), 6, 8. (a), 9. (c), 10 (b). 176 Section ‘B’ Very Short Answer Type Questions 1. What is activation energy ? “Ans. Activation energy : A certain 2026.02.24 20:31 vivo Y2Oi 2026.02.24 20:31 Vivo Y2&Oi 2026.02.24 20:32 vivo YEO 2026.02.24 20:32 per) (6.8) model Pape! (narmple PA | Prabodh a cerochembeal sorton 7 Write four Wiss be ele chareetertstien Ana, Kleetror herent The arrangement sere naan ng order ot iit of different © fas je called « te potential 1s their standard © tivity series of Hlectrachernical perien | cries Li/LI" i at the top tom, Ht shows that chemical series af a Characteriatios « (1) In elevtrochernie al is at the bot position: and Fy , y to Coren Lt fiahium has greatent tendlenie (ii) The tendency of an clement to undergo reduc ton increases fron Wp The elements occupying higher position to (hit) reducing agent than hydragen im series are better hydrogen because these have more tendency to get oxidized (iv) An element acquiring higher position in the electrochemical series will displace others placed below it from their aqueous salt solution, (v) It helps in predicting the activity of metals order of activity of halogen is | > Br > CL QIK, What are Transition elements (d-block elements) ? Write their general electronic configu- ration, (5) Ans, The elements whose atoms in their general slate or ions in their common oxidation states have incomplete or partly filled d orbitals are called transi- lon elements, ‘Their valence electron enters in (n ~ id orbital hence, they are called d-block elements. |i periodic table they are in between 2 and 13 group, ‘Their general electronic configuration is (n=1)d"" ng? , — + Fe, Co, Nieto, Explain the following (i) Change in for transition elements, atomic and Jonie size, (i) Lonisation enthalpy, aun a i) Pam alomie and lomle size ; jy mowing from Left to right in decreases but the Siass jevnie radii (Hanibar CHAR BE) alse pegs - doorensing becaune dus 10 pOOT screening aff, selectrustalic altraction between nychege iranaition * t om af d-electron { outermost elect (nthalpy ¢ le transition clemeng on moving fram left ta right if a series ionisation py generally increases because nuchear change sen, Bui, this increase in tonroation enthalpy jg vely less due lo screening effect of shell, There ia a large increase in theiy second and third jonizatlor rut veal pry. (i) Complex formation + ‘Transition clement mostly form complexes with ligand (Lone pair elec. tron donor) due t following reasons © (4) Small size of cation and high effective nuclear charge on cation, Thus, they attract ligand towards itselll (ii) Availability of empty inner d-orbilats of same energy in sufficient number which can accommodate lone pair of electrons for bonding with ligands. For example ; [Fe(CN)sI* [Cu(NHy)4)" ete. Or Explain the following in transition elements Why are ions of Transition elements coloured? Explain, (i) Metallic nature, (ii) Alloy formation, (iil) Variable oxidation state, Ans, (i) Metallic nature : All transition elemen have one oF two electrons in outermost orbit they can ewsily donate, therefore all transition elem are metals and good conductor of electricity and het These are hard and malleable because its atoms linked with each other by metallic bonds. (it) Alloy formation : Transition metals ate e%, ally one of the constituents of large numbet alloys, Due to almost similar atomic size, ase one incre charge ane Oo a (ii) event vivo Y2Oi eoeeoer.24 -O:2 a acid jg iS Stronger eet BET ih, a | PRABODH Mopbet Parer Ser-Htl| tn: As belo itive TYPE Questions in presence 1). Choose the correct option: (1x10 = 10) and B-hyai of L Chemically semi-permeable membrane is : a (a) Copper ferrocyanide (0) Copper ferricyanide (c) Copper sulphate {d) Potassium iodide. L Whose layer is coated on galvanized iron: (a)Cu (b) Cc (c)Zn (d) Ni. Ey If rate constant is k, then equation of half life period for first order reaction will he: to 23 ae ne or, oo 3a" K on: oo 4. Stable oxidation state of Actinides is + (ay+1 (b)+2 (c)+3 (dy +5. 5, Oxidation state of Niin [ NICL)” is! (a)2 (by 4 {c) 0 (d)6. 6. Main use of D. ID. T. is : (a) Insecticide (b) Refrigerant ,, CrAamemherc (0) Solvent. + Tsuen for alcohol : (a) CH,0H 4. uae ‘Tollen reagent is : (@) Complex of Cyt (©) Complen of Cur Ag with NHL, (b) CHLOH (d) CHCHL. Vivo Y2Oi 9. Hinsberg reagent is : (a) C,H,80,C1 (b) CHN,CI (c) CH.NO (d) CH,SO,H. 10. Rickets disease is caused due to deficiency of which vitamin ; (a) Vitarnin A (b) Vitamin B (c) Vitamin C (d) Vitamin D. (c). 3. (a), 4. (€), 5, (a), 6. (a), 7. Cb). (a), 10 (d). Section ‘B’ Very Short Answer Type Questions 1. Write an example pseudo order reaction. ay Ans. CH,COOC, H,+H,0 > CH {COOH + C)H.OH. 2, KMn0,+H;,0 + 2 MnQ, + A + B com- plete A and B of the equation. a) Ans, KMnQ, + H,0 + 2Mn0, + 2KOH + 3[0] 3. ROH+HCI > ___* com- plete the reaction. iw Ans. ROH+HCI > RCI + H,0. 4. Write structural formule : a) 1,4 Di bromo but - 2 ene. Ams. H,C—CH =CH —CH, & be 5. What is Luca’s reagent ? iy Ans. Mixture af anhydrous ZnCl, + Conc. HCl1is known as Luca’s reagent. Answer Type Questions-I Q 2. What is specific conductivity 7 Write its unit. (2) Ans. conductivity of a solution is defined ‘as the conductance of a solution of 1 em length and area of cross-section | cm’, Alternatively, it may be defined as “conductance of one centimetre cube of the solution of electrolytic”. It is denoted by ¥ (kappa), Tris reciprocal of specific resistance. 2026.02.24 20:32 = class Xi | 2 ao c.G.): Class a ——— paper (Sample Paper) (CE —— | Prabodh Model Pat Q. 4, What do you understand by Ligand gj, mane z mple. : Unit of specific conductance hist : Any ion, atoms oF motecye % ae ee =cen const} has a tendency 10 donates lone pair of ¢ Whe A central metal 1on and form co-ordinate bong is Kony ; as ligands. ‘The specific atoms which actually : Unit of * = 1x ohm tem an electron pair is known as a donor. i cm cm’ §, Di-Ethy! ether is soluble in water. 4 order and rate of a reac- Q Explain Q. 3. Determine the order @ reason. i F Q iia Ans, Solubility of ether in water 18 GUe to fom, rity, EE 9 Nayg) +3 tion of hydrogen bond with the molecules of ae Ans. Rate of reaction : ‘So: wth - of 21_1 [Hy ‘ ; I aa) Ae) 1 Bb R ‘tat “ or Rate = k [concentration]". Q. 6. Complete the reaction : a ‘Thus, order of reaction = 0. ROH + SOCL — ? Ans. ROH + SOCL > R-Cl+S0,+HC) ee i p RA Q. 7. Explain the Coupling reaction with example. Ans. Coupling Reaction : When benzene diazonium salt react with aniline or phenol at (PC in dilute acidic medium and form yellow dye, p-amino azo benzene. This reaction is known as coupling reaction, (0): =H] (0) x, 8 (O)-N-N-XO)- nu, eae? Aniline p~-amino azobenzene (yellow dye) Q.8. 8 gm NaOH is dissolved in 250 ml water. Determine the molarity of the solution. Sol : Given ; Mass of NaOH = 8 gm Molecular mass = 40 Mass of solute x 1000 Molecular mass of solutex Volume of solution in litre Molarity (M) = 
