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ISC Class XII Prelims 2025 : Chemistry (Shaw Public School (SPS), Kolkata)

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Sanchita Majumder
Shaw Public School (SPS), Kolkata

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SHJ\\\' l' U13LJ C SCllOOL l'R E-FfNAL l '. XI\M INATlON 12024-2025 1 CHEM IS l'H.Y Pi\ PEH ! (THEORY) F. M: 70 CLASS: Xll 1,1!\ ll . l llUUI{::, 1nd t < d,il( ~ ,lf\..' allu" ed c1dd1liu11.il IS minute~ !or nnly t eading the lldl"Jer. Tiley must NOT !>lctrl writiHg \ 1lll Ill~ th1~ llllW . ) Ans\Ver all qucsli ons . J ividt'd into fo ur St'Clious - A., B, C amt D and has 21 questions in aU. :::;~ ttL:ll :\ hi.ls ft)l tt teen s11b-p<1rl!>. Each quesliQn c,11Ties l mark While '""Jttemr>ting Mull.iple Choice QuesLion~ . .. 111 St'\ uo11 -\ Yt ' , iu alt' L'PQtut-ed lo write only onr option as the answer. , . ~ t:>l t~on B h,1s ten questions. Enclt question carries 2 marks . 3 marks. . carries E ,ac h question Section " qucs1tons. , . C' h..is scv"n ~f'~~on D h~s three questions. Erlch qucs<ion carries s marks. lntellltll ~hoice~ haYe heen provided in one question each in Section B Section C and Section D. All workrng, including rough work, shoulrl be done on the same sheel as ' and adjacent to rhe rest of Lhe . er The tntenLIccJ marks for questtons nns,, or parts of questions are given in brackets [ ]. ~ B<1.lallced e_qu&ions must be given wherever possible and diagrams where they are helpful. When s~lvmg numerical problems, all essential working must be shown. '.:1 working out problems, use the following data: 3 1 1 <....,as cunSl,tnt R = l.987 cal deg- 1 mol 1 = 8.314 JK 1 mo1- 1 = 0.0821 dm3 ann K moJ- l l aLm = J dm atm =Avogadro's number= 6.023 Xl023 IO l.3 J. l Faraday = 96500 coulombs. 11 , u_:,. p.ipc:>t 1 " 0 [SECTION A - 14 MARKS] QUESTfON l l4X lj Fill in the blaoks by choosing the appropriclte word(s) from those given in the brackets: l low. high, square root, absence, cube root, directly, Cannizzaro, op _~~. Schotten-Baumann, (n-l)d, ns, presence Rosenmund 's, inversely, linkage, geometrical] The degree of dissociation of a weak electrolyte is _ _ _ _ proportional to the _ _ _ __ ( i) of it's molar concentration. Inner orbital complex is formed by the use of _ _ __ orbitals. Such a complex is known as (ii) _ _ spin complex. Benzaldehyde undergoes _ _ __ _ reaction due to the _ _ _ _ of o.-Hydroge n atom. tiii) [Co(Nrl1)4(N02)J]CI e.xJ1ibits both _ __ _ and _ _ _ isomerism. (iv) [7Xl ] (B) Select and write the correct alternative from the choices given below: fo rm lo chloride (i) A compound X having molecular formula C3H9N reacts with benzene sulphonyl a solid that is insoluble in alkalis. The compow1d X is: (a) CH3CH2CH2NH2 (b) (CJ-hhCHNH2 (c) CH3Cl-bNHCHJ (d) (CH3hN {ii) Which of the foUowing is correct: Bromoethane and Chloroethane mixture foUows Raoult's law. (P) Tn Ethanol and Acetone mixture, A-B interaction > than A-A or B-B interaction~. (Q) fn ChJorofom1 and Acetone mixture, A-B interaction < than A-A or B-B interi:lctions . (R) Bromoelhane and ChJoroethane mixture does nol follow Raoult's law. (S) (d) Only P (c) Only Q and S (b) Only Q and R (a) Only P and R reaction? substitution c Which of the following compounds does not undergo nucleophili (iii) (d) Benzyl chloride (b) Vinyl chloride (c) lsopropyl chloride (a) Ethyl bromide (A) 0 ' (iv) The sequence in which amino acids are ;manged in a protein is called it's ___ structure: (d) Quaternary (c) Tertiary (b) Secondary (a) Primary 1 P.T.O . u idiz:at1 . 11 0 f Ni Wluch of t.he fo llnw111g statements is not conecr :1 (J) The complexes [NiCIJf and [Ni(CN)4f differ in t11c !,rate of.hy ~rerti es. (b) The comple,, es (NiCl.,t and [Ni(CN)4P- differ ,11 the rnagneuc pr rs (c) The complexes INiCL1t and [Ni(CN)4f differ in the geometTY encieS of Ni. starenien r.vo (d) !he complexes [NiCLY- and [Ni(CN)~Y- diffe1 in t:he prlrnary v:lad the . N3 1 Given below are two statements marked Assenion and Reason. R (vi) all l bro01ides wnh carefully and select the correct option. des or, (Y cJ ' . . 11. . i,UJ1.y[ As uon 10d1des can be prepared by treali11g alkyl . semon. m acetone . Reason: NaCl and NaBr are soluble in acetone but Nal is not. xplanauon f assertjon and reason are true and reason is the correct e n of .issrruon (a) BoLI1 assen1on io exptanat correct the not is (b) Both assertion and reason are true but reason (c) Assertion is true but reason is false t cements (d ) Assertion is false but reason is true 5 th a cwo e Read Reason. and Assertion marked ts statemen two (vii) Given below are carefully and select the correct option. Assertion: Manganese shows a number of ox.idation states. . . Reason: The difference in energies between 3d and 4s subshells is large. c1sseruon t . . . 1 (a) Both assertion and reason are true and reason is the correct exp anallon o (b) Both assertion and reason are true but reason is not the correct explanation of ;isseruou (c) Assertion is true but reason is false DJ . . (d) Assertion i.s false but reason is true Read the following table given below carefully and answer me quesuons that follow ( C) th ere Most of the chemical reactions are accelerated by increase in temperature. At room temperatu~e, . are no molecules possessing energy greater than threshold energy, Consequently, there are no effecuve OI ~o equal e1~ergy absorb s collision and hence no reaction. On increasin g temperature, reactant molecule the t.tme taken greater than their activation energy, me reaction starts. For example, in decomposition ot N20~, _days fur half of the original amount of material to decompose is 12.m.inutes at SO C, S hours at 25 C andlQ ',., .... a o[ constant rale and ure temperat at G.!-C. Arrhenius in 1899 gave a quantitative relationsh ip between [R=8.314 J/KJmol] <-reaction. tical expression relating Lhe variation of rate constant of a mathema Write the logarithm version of (i) r ,, reaction with temperature. - 'l Give the graphica l representation of the above expression. (ii) energy of the reaction. activation the Calculate -5841. is graph (iii) The slope of the line in the ~, N .. , ,- c,:, ,1 (. [SECTfON B- 20 tvlARK SJ l2J Question 2 Answer the following : 1 Wl'!)'.JS il necessary to use a sail bridge in a galvanic cell? /1, '1- / -' - ,, 1,, . , . ... 1 ;,,, (i) How can you increase the reduction potential of an electrode? (ii) [21 Question 3 (BJ ds An alkene (A), with moJe~ular fo~ula _Cs~ 10 ~n Ozonolysis gives a m.ixture of two rompotin . and (C). Compound (B) gives pos1uve Fehling s test and al.so reacts with Iodine ,md NaOH solution (C). (8), (A), fy Identi . iodoform Compound (C) does not_react wi~ Febling's soluti~n but forms Write lhe baJanced chemical equanon for the formauon of 10doform from (C). [2) Qucsti_9R 4 table the in p and o N, M, \_/Four compounds CH 3~1.' CH~r, C2HsBr an~ C3~ 1I are represent~d by letters cts do N and p below (in random order). B01lmg pomts are also given m the cable. WhJCh of the four compow1 most like] re resent? 101.G r, C 3.56 C 38 C -24.2 C Boilin ojnts --_j n dt:~=== =1JM~~:=~~========t N~=========== ==tior~ =~~=== =====j Jp~~== ~~-___ __j t fC~om~~~o~u~ (v) t_ ( 3, .i~ ..- , 2 Q111'~ti1111 ;, /\ llrst . 1, . ,. . OI L Ct rc.ic11u n of lhrs l'CclClion'? Questi on ti [21 lction . r d i~ 40 ' 0 . l<C fur 80 % <;OllljJ COlll p 1CIC rn JO llllllU( C\ , Huw much UlllC will it IJ . 121 Tl Cl I . I., . , I I idc in Cc,t J, Nl IC:O tr ron1pou11d .. ' ' i lS O IOIIHdwltl'llcl lOll1flfllllld /\ 1w 111~witlldCCll i dll lY(l ' 1l ' > f l)rc s~ O e. pyndrn l:' Le Identify C0lllpound A. (~~ 1 WrilC' IJ1e balanced dwmical cqu~1tiu11 of /\ wi tJ, Hr/ Hi >m ruum wo1peralllfl'. 121 QueM iu}; ) which. . complex III . auon coordm O . ,md Wrtl C' IUP/\.C name of l hc, Jollow Give mg Pt . formul r1 11h AgN 3 w react nol docs x . 15 bo~nd to !wu chlorid e ions and 1wo ammonia molecules. The comple . 1 !:>O utton to give whnc precipitate. l2J Question B tc.Ientify the alkyl brumiJc r1 t1cl W!lliamson's synthesis is used for the prepar.~Uull of ctht-:rs from alkyl halide. [2) :-.odn11~1 all<oxide used for the preparation of 2-Et.hoxy-]-methyl pentane. . Question 9 You have been provided with three orgilnic compound!> given below: Q) . 3. Benz.ophenone 2. Benz,tlclehyde l. Acetophenone 111 HCN uf 1 adcliriu1 s toward ity (a) Arrange the compounds in the iucreas ing order of reactiv d 'J presence of a base. with compo un (b) Give the structure of the major product formed when compound 1 reacts in presence of a di lute alkali followed by heating. lORJ 11 underg~es Etard's reacri? { 0i) ' -(-a) Give the chemical reaction involved when p-nitroto.luene anhydrous A.lCh tonns toluene. Wtl_l the l:-." l~(B)B~nzene on reaction with CH3Cl in presencecofacid? Give a reason in support of yoU1 L;' - action occur if benzene is replaced by benzoi , nswer. rJ.,t Quest.ion 10 ing cell reacti on 1.111der Ca.lculate the value of E cr1i and t:1 G th/:1 1ca.11 be obtai ned from the foUow (1 Faraday= 96500 CJ standard condiLions at 25 C. O 0.36 VJ Zn(s) + Cd2 '{0.2 M)7 zoi '(0.0004 M) + Cd(s) lGivcn: E cell= 1.2] Question 11 of compounds: Write a suitable chemical test to distinguish between t.11e following pairs (ii) Phenol and Propan -2-ol Ethanol and Propan-1-ol (i) 1 \ [SECTION C-21 MARJ<S] 13l Q t1stion 12 ,,/ Identify t.111:~ compounds LAJ, [BJ, and ICJ in the follow ing reactions: c..\-\3M_SB..- H2/ Pd..- BQS04 Ptl5 ( i) :------------~ lCJ Cc.HsCOOH--------- ----------------) [A]--P.; 0Tfi11f-j~ji-ni [B)---- -ii~o~i <iiJ (CH,),CHcooH--~ irf Question 13 ~~~---->lAl--------Kcif-------7[ BJ-------1.TAT!f~-----) Ic I . . . n [3 j rr B C, ITC> fl IS: II B< The relation between the osmoLic pressu re~[ three soluuons A, Band C ature] temper same t.l1e at [ The three solutions have the same molarity and arc kept 1 For which of the solutions is the value of i expected lo be Lhe greatest? (i) chloride? nm Sodi and te sulpha ium Which of the solutions is most likely to b J A , Po'2ss (ii) to thr1 t of lar i sim grapfi Which of the solutions is expected to give vapour rressure-mole fraction (iii) !AJ. " 1 acetone-chloroform mi xture? 1/1' 11 (4 3 P.T.O / /j)C 1~/.t., A, fl /\.> f'\ ) I Cu 1 ' t ~ r __. Qt t"'- lh: O l.-l ,._ I ,i,-4 ' r l\ -; t l fl t-< 1 '\ h, Vo - l 1 ' J ~ ,, ,\' \. l"I . r ' . I ' ' . . \\ ,1..,; ihc k l'Y Lnmp on" "' .,. ... fl .. l" ,.ft '. t U l,J I J f'"' ,-ra;,, r.'4 .t f tli l-.,,,'. ~ .-.-tC.' t, ._, .t' ~ \ r 1 I I (,I I I ;ia ll) 1\ t llJ \ ~t()n<:' I in thl' p,11d11111011 " ' ,11, ,11 111... ,_ J41.111puwdf!r tnmJit, ) u"'u I.J y the,, .o\llir!- ll1 ' ' Nld Wa, I. ArP.(Oll(' \\I.I'- p1r v1011s lv 111.1d, 11 111111 ,tl , 11111' dtf tt 1m,,un11d rrorn t,nrm1 111y, 8lttt ~ -\ll.Jrc; W(Tr rn w.1n"ilh llltm, . 1lw; \va,; ll(l lt,ngPi ,i. . i1 ,. 11 (It.f\ 1 .r~ r . ~ Ot(u i.Jt, ( 1) Ho\, hill \Oll f'll'j13 T'{' ilu' tnnr f1 0111 C'itl(11 llllll .,, , 1.itt7(GJvttd1fnllt.itl t>{IIJ.QUOII) \ ,~ -" f l t ~i t) If But,m-'.:'--ol i~ 11tidi ~ed hy l(.,C1 t 1 . whirh keio ,, 11 wtU bf produrcd'? \Hi) Hr \, \H111 ld vo11 oh1 ,1in ,1c<'to1w f rD111 /\ ('c't vl r hl n, ,tie? (Glve bolnnc-rd t.:hcmlcul , quarlot1) (~ J C{t1c, non 1., 1 1 ( t) 11,r ,pm only mt1.gn~t1t mo11ll'nl ot I MnB 1ii ,~ 1 ' l 1\1\1 Pn,'t.il t:t the gmmu uy of thP I o(Tlp lf'X Ion 1 :.-t"'lin g the tyrw of hyb, l<liLdt h1J1 vi tin 1 1 1111 ,ii 1111'1,I I It 11, (u) F xplar n ol the hu:-.b uf C FT why t 'o(l11) fo1111 . _ p, 11 , 1111,. ,., ,ttl<.' \}('tahr<lrnl ccu11plt:Jt. wi t~~ Wf: 1k llt ltl 1 h~:rn d-, whereas 1t fonm diam,1j:\nctir ocr,1h r d1 .il I o pl, :< wlth strong fie ld ligo11d1:. . !Cc, 27 1 111 (rn ) G1'1' thr fmmu la of' tP1rad nun i11c di Jquad11,1111111111(lll) l11'01t\tde. Qu~~t10n 16 I !I (1 ) ( ondu cuv1ty of 0.002 4 t 1\1 ,,r etie .incl,~ 7.11% x 10 ..., cm '. Cakulare Jr' s mol,11 n 111rl111 t1v1 1y t1lld d~r(>t' of dis:ioci,11,un 1f~_lo r ,Jll'lil' ,Kid b J ~)U s 1111 ' 1111JJ4 , Whtlt Is lt' 5 <J1ssoc:lmion <..U t1Cil,H1t 7 I"\ ne, lOl(J -- {!IJ (<1 ) Wlut 1)1H' u t Ballt'r} 1:, Lcud !:.lnr,,gt> li<1 t1c 1 y:' Justify your (1))\,\ lrilL' the anod~ 1-e,JCti on, callwdl redcli on .rml answ(.lr. overoJI feactlon of rh.l.s uttuery wht n t'UJ l t.'llt ,s dra' " n from it. (c) Whic h cell ,._ usPd in h<.'Mi11g aid!:> -i nti w.itrl H 'i? Q u(>Sli o11 17 I:q (i~ \:iram in5 ate rl'qu m:cl i11 ve1y small ,11nou111 fl,r 1lw lw,tl1hy growth of org.mh,in:-. . WhPrt c1 p, 1:-.1111 dew-; 1101 gC't a parricular vitamin m diet, she/he mny :,ulfl t lrom certaln dJscnses. Norn1,1I fun ctl1111 l11g of , 111 organism ran be greatly c1ltt>Cll'd due LO dcficiencv ut v 11om ins in 1hc body . .._(ii) Which vitamin defic iency causes ricket,; c111d ~nu vy'? N ~ \11) t-i ,. 'Ir\ ( .l I.MTl v j ~Jl,j Do you think, all viLa1runs ctrt:' w;11e r ~ lubJ~ r' Ju~tit .).'...your an~w ~ with pwp1 1 t .x,unpl( , {111 'Vi11<1t rype of i5om ers an glurn~l' and Jrt15l ol,P .' V1\ & "--" 6 4ue~uon 18 ., For ,.he reaction. A ,it 298 f 8 . Prodt lllS, K. --- f.X PT NO l ill(' d ,llcl \Vl'I'(' ~ mol/L ___ ___ __ t - -- 'l . Lhl' fo llow111g 10 - 2.l) - - --- - llti_1nol/L 0. IS 40~X 10 1.- - -- A I J l ~l~l'TION O 15 MAR KSJ l'J I ii rJllXIU ll u f 1w 11 ,u1111J,lllt I u 111p 111 1111I.., /\ ~111d IJ.w.i:, M'!J,U, tlt d liy dis ...ulv l11g I! 111 llilot o lnrtti lo!lm q d rJw f'J1l J tJ1 l ll >ll w1tl1 ,JtJ 1t1 1111 , K< JI I c,111l1111111. 1lw 111g,mh' l.1y< r ronl'd lninu cu 1 f' \ ' h , 11111011111 '\ . o 1;,1d1 nlcul11,l1t I<( )II 111<1d11t1 d ,1 tt1111111111111 f'II 1IP,Hl' ! 1 l L tl 11 ,N ) ,1S~111 i.1t< d wlth ..in u11pll 't1~. 11 it odiJu i . l'ht ,,lh,tlH tf .,,411 r w1i, l,1 y1 1, 011 Llw o!lil r li.111d , wh1 n hl',tH tl wuh c hlnwf111111 and tl1t 1 1 Jl ldilll'd ~,wi " lll PtliJJf' 1,f two i1,1>11Jl'111 , ur11p11 1111dll t} .111d 11 h with 111 ll t ulur ll 111nul,1 ( ',11..0 .. l1!Pntily , ompoi1tt1 b ,\ J. Wrl1, llH'JI ~(JIii ltll ,,y Y t'~. -.j I GO X lQ_1.1 w, llf' tl1t' l 'l(J)rl' '>lilon ol rule IJw, ( /tH . UUII fi j \V\>11' t.1k1:_ 11 = i f-.1 tc: t~ l/1 .,1, . ~0X t0 " ()~1-i;: : ,_ - - --_ l .O 0.20 __ , _ _ AJ1'>~ 1~1 th(' lollov, mg qut. stlo11s: {J ' \'Jh()t J\ tlw mdf'J of lill l'l'.'.l( 1io11 with n i.1wct tu I\ .ind ll? id ) 131 collt:>cled. All the ll\(ld' >lll'Pn wlll", ~ "$ -, "1 "" "' -- -- L ~ ~ l: :< '" < u "-i"-"' ~@ ~~ lii) Rita was g ive n two test rube.s. On d th I . e and the oth er con e of th e test tubes con tam tained e e Y amrn ani line . To disti.nguish bet we en the two com pou nds , she add b Sh ed 5 a rea gen t X to bot h the te l tu cs. obs erv ed that in onl y one of c the test tub es~ yel low dye f~rmed . : :r- ,S ol.. u (a) ldentifythe reagentX -"' h c{ t,t J7 I/J'"1 c <W\.~,...,,.,.1 , (b) Describ e how this reagent ~_p . . ~pa red and giv e a.reason wh y il is not rea dily ava ilab le lab ora tory ? @ m ~e -t- ~"7 -4- u.., ~ C.t (~ J i,1.L , l, + ~ Ml ( j ~ .,.,, (c) Wh ich of the two com pou ~ ) 1;,,, ~J l\. L. l ~d lA,- w nds fanned yel low dy e? .~ (d) Draw the stru ctu re of the yel Gt. ,~ f)\ AA AL v- V "l. ~ low d~ , for me d. 1..2,.,-1 ~ j,.,t.ll.,.cw ~ \( ~ l V\ ~ ~ tb u..,. nu ->(t.Lt\ ~ . ( 2 _ ~ ~ '-{ est ion 20 ~ __ ou-. 0-~=-l'l --< )-o-, f"U (i) f~ Ansv,ier the foll ow ing que stio ' [SJ ns with res pec t to the ser ies of ion s giv en bel ow : Sc3 ', Ti 4+, y 4 , Cr2 ', Fe1 , Ni2' , Cu 2 , Zn 2 ' [At om ic num ber s: Sc= 21, Ti= 22, V= 23, Cr:::24, Fe= 26, Ni= 28, C u=2 9, Zn= 30J (a) Wh ich of the se ion s are iso ele ctro nic? (b) Wh ich ion /s from the list is/a re not the ion s of tran siti on ele me nt/s ? (c) Wh y do Sc3 ', Ti~+ and Zn2 ' fmm col our less aqu eou s sol utio n?. (d) Cr for ms two typ es of oxi des in Cr' and Cr3' stat es. Wh ich one of the m tur ns red litm us (e) Wh y are allo ys mo stly pre blu e? par ed from tran siti on me tals ? (ii) Co mp lete and bal anc e the foll ow ing che mic al equ atio n: lKM n0. +3H2S04 +'l'H2C 04 2 2.f\MI.~-,. + I ou)L + ~ ' l Qu esti on 21 + ~ltz. o (i) (a) An exp eri_m ent wa s car ried [SJ out in the laboratory to ~tudy the dep res sio n in fre ezi ng poi aqu eou s sol uuo n of Al( N0 3}3 nt. 1 M and 1 M of Glu cos e solut.10n wer e tak en. Fro m the giv en fig ure sol utio n 1 and sol utio n 2. Giv ldenti f e a reson in sup por t of you r ans wer . ~ (~ ~ l- L -M c~ ~ ~ y -~~ )17,,\ ~,.~~ -JLiX~ . ~ \- t,-1\t'W .>o {-1 U7\.,.) T, - ---- --- - -- --- - - Ttrt1pe1't\.tiJre. -- -- (b) The osm otic pre ssu re of was di.luted five tim es, calculate a solution of cane sug ar wa s found to be 2.46 al1TI. ar 300 K lf the the osm otic pressure at the sam . e tem per ature. (c)H ow can the osm otic pressu sol u tion re of the giv en can e sug ar solu tion be dec volume? Giv e a rea son in sup rea sed wit hou t h poi rt of you r answer. . ., ~- dt~A . c ang mg lt s [OR ) (a) A stude nt was doing an exp eriment by tak ing 0.4 g ace tic acid in 40 g of ben zen e. Sh observ ed tha l the free zin g poi dd nt of the mLxtu re is low ere d by 0.4 5 K. Do you thin k ass oc: acid has taken pla ce? If yes, wh ~u011. ety . at will be the deg ree of associatio 0 n? [K, of benzene=S.12 K Kg/mo areL1c l, Ato mic ma ss: C =12, H= l , 0 =16} , b)O 1 M glu cos e solution and , 0.1 M Kq solution are kept Ba nd A resiJecl ive lv) in a con . .in two. dif ferent compartmcn tatn er and sep ara ted them by a J = ( ma ne 1 d as sem 1pe nm abl e me mb rane In the flow o f sol ven t wiU tr1ke pla wh. i ch . ce? Why ? On whi ch comp,irrme . 1 ' C1lfec -t101 nt rre ssm e should be app of solven t? What is thnt pressu lied to sto p the flow re called? (ii) ~ -1 ~ U\ ~ ~ c;. ,,t. 'd L-- ~ f.) ~ ""-i ~ - - -- ---- --- ---- l - -~ - ' - - - -- t -.;.) ~-~~ - s f"\,Ql'\S2.. ~ ~u ~ ~ t l l \"I ~J ~d U:., . l l. I~D.U,.. ~ . ____ T1. _:1f ,. ~ d~ r,..._, I) ~L .t. . j

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