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CBSE Class XII 2011 : CHEMISTRY

12 pages, 134 questions, 106 questions with responses, 124 total responses,    0    0
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: iIii1 5 6/1 N ~. . ~ - ~ 1 j'X9 - a, a nswer-book. t he - ~"q)T o f 3 't'R Q )) p age m t a fTW tR~~1 ~ itle I I Candidates must writ,e the Code on t I he I I I I I I I I ; II . f I I Q5)s C ode I 5 0S ' Series ~ Roll No. I i . 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. question paper will be distributed at 10.15 a.m. From T he p before aper. q question uestion t the his r of ead t o a Number llotted b Serial een h the as t ime m 1 5 . inutes Please write down attempting it. ! 10.15 a.m. to I ~ - q'{ 1 J&-~ ~ ~ -~~ I I ~ ~ 1 2 q j) # ~ ~ ~ q j) f q'(f{ur " qjT m -~ m -~ ~ 1 t ~ I ~ ' ('f'q=j ~ ~ f 7 0 7 0 : . 0. T P . 3 i?!fi M arks: 3 1ti:1q;rrJ1 M aximum 1 ., ~ ( Theory) f a~R h ours F 3 (~c.9.I~<t ITTi?:: 3 : ~ 56/1 ~ ...' " Gt1T ~ 1 ~ 0.30 " qjT ~ ~ f ir;R: CHEMISTRY q'{ ~ 1 5 1 0.15 ~ ~ -~~ ~ I ~ ~ ~ q j) f 4;7o1r ~ ~ ~ m -~ ~ 10.15 ~ a llowed: Time ~'t1lq~ R~ ~ ~ ~ m 3 0 ~ ~ # ~ # m -~ ~ m -~ ~ ~ ~ ~ f Cfi f Cfi ~ ~ ~ ~ ~ " Cfi"'{ ~ # ~ ~ m -~ ~ ~ m~~~~~~~,~~~~~1 ~ . . . . . 10.30 a.m., the students will read the question paper only and will not write any answer on the answer script during this period. i ';) ",' t , 2. What is meant by 'shape selective catalysis' 3. Differentiate between a mineral and an ore. ? 2 8 m -m, i J;;:JTrljt1J # i"<'ji"N2"U" Define 'order of a reaction'. ~I ? 3 qft fj11fff 3 ~. I ; I ~ I ~ . 3 fq; 2 I ~ 3 fq; 1 f t1Tl: I ~ . " 1Tl:?" G '"\9Jk 3 fq; ~ i J; m ~ I ; 3 1Rqr2f m " fit (i) : ~ H/~/-<I a llowed. n ot i s c alculators o f U se n ecessary. i f T ables, L og U se (vii) questions . 3 fq; 3 f t1Tl: i J; m ~ I ~ . m ' (';ffj-:'3"ffftlT 3 :rfrr n q;- ' fl8 1 m -m, (ii) Questions number 28 to 30 5 marks each. fq; i f t1Tl: i J; m ~ I ; m ' (';ffj-:'3"ffftlT n q;- ' fl18 9 m -m, (iii) (vi) long-answer J; m ~ I ~ . m ' (';ffj-:'3"ffftlT 7 ft n q;- ' fl27 1 9 m -m, (iv) Questions number 19 to 27 are also short-answer carry 3 marks each. short-answer 5 f t1Tl: i J; m ~ I ~ . m ' cftFj-:'3"ffftlT ' fl30 j t1'Mf7Tq;r qjf /< ~ m I ~ m m < 1/ q , i .j i i q ' 3 1/ (v) (v) are 3 I ~ v ii) (vi) Questions number 2 marks each. are 1'4 ~ C q;1~''qj) ~ iiT ~ ' ) f CfC:q - ~~ ~ .'3i~~ ( 3 Tr'i:"frf{ff 1. ~ ( (iv) 9 to 18 I ~~~~~-q:3tw~~ e ach. m ark 1 carry a nd q uestions s hort-answer v ery a re 8 t o 1 n umber Q uestions (iii) i t. a gainst i ndicated a re q uestion e ach f or M arks (ii) (i) 2 56/1 General Instructions: All questions are compulsory. questions and carry and questions and carry - (i) (ii) Rk1I(.1I~d "q)"T qj~ " # ~I~I~ f4~ # ~ ~ ~ ~ ~{10!4-1'i ~~ ~ ~ ~ 56/1 - # ~ ~~ 3 "q)"T ~ # ~ "q)"T ~ m s olutions. C X.j1~1 ~ ~~ i ts o f c ell u nit o f m etal u nknown a n o f : ~ ~ of their ~ ~ ? ~ i 1:r ~ order ~ ~ ~ ~ ~ ixture. t o m ass ~ # ~ ~ increasing a i ~ n ~ ~ g ~ CX.j~I-1 d imensions a tomic (C6H5)2NH as f u{{ "q)"T ~CX.j~I-i r t he t he an eference ~ a nd ~ ~ in a o ~ ~ C6H5NH2' C6H5N(CH3)2' i ~ ) m m d etermine ~ C6H5NH2, C6H5N(CH3)2' n f orm ~ d ensity c an' ~ following f p g eneral ~ ressure p ~ artial ~ y ou ~ the i ( ~ m ass i ts h ow Rk1I(.1~d ? ~ ~ yidRd i 1:r a :rrq # ~ ~ ~ 1 ? e thene t o e thanol c onvert y ou w ould H ow I ~ 3 :r~ ~ ~ 4-q.<:"J1\1~;?:-1-2-:ift;r the structure ts i 31N ~ n ~ ( ~) k now E xplain Rearrange a I ~ y ou if C HCH2Br = CH2 : ~ ~ ( IUPAC) 3 1r;f;.~'q1.1;.m. " q)"T ~ 11k11(.1~d bout l aw the l State -1lcfJl( ~-~ Draw aw 11.' ~ ~I * R ~ 8. aoult's yRcfJl(.1d 6. H (i) 7. C HCH2Br = CH2 1 c ompound: f ollowing t he o f n ame A C I UP t he W rite 5. ? ~ ~ ~ ~ ~ ' '~~-110!4-5 4. enry's (ii) 9. 'I What is meant by 'lanthanoid contraction' ? 1 of 4-chloropentan-2-one. 1 basic strengths: 1 (C6H5)2NH and CH3NH2' CH3NH2' crystal. 2 ~ ~ 10. Calculate the packing efficiency of a metal crystal for a simple cubic lattice. following: : I I P.T.D. 2 2 - -cc,~ III_IIIII= What do you by order of rate a law and reaction if rate the constant units of s-1 : ~ ~ W ~ ~ order reaction with phase refining of titanium t o metal ~ : q uf;:r I .IR~(UI ~ "qjT ~ ~ m ~ ~ \ ~ ~ q R ~ f&1 ~ ~ ~ ~ ~~I~.s 4 56/1 Cii) G1~~'Jr ~ Froth floatation method of concentration of a sulphide ore ~ Cii) ~ " CfiT ~ processes: Vapour Ci) how H ~ 0 .6021) ~ " - ~ qjT each of the following = 0 .25 ( log ~ H CO2H ~ H I CO2H ~ ~ ~ ~ ~ ~ ~ I .IR~(.1~ I ~ controlling Ci) 1r1~I(.1I~(1 a CO2H o f q Calculate uantity i temperature. nitial o f a certain t s -1 ~ the principle is a first 0.6021) ~ 1 0-3 m ~ m x 2 .4 - 3 l~ q"{ - = 0.25 ~ Describe s-1 at hree-fourths f or t ake i ~ " ffit1" ~ ~ -~~ W ~ Clog of HCO2H x 10-3 of 2.4 decompose. ~ 3 s decomposition t w constant ill rate l thermal ong The ~ :{fi:{~ ~ s-1 1 -1-1 m L mol o c o. ) 1 L -1 1 Ci) ~ ? L mol-,-1 1r1~I(.1I~(1 c, rate s-1 Cii) 14. its a ~~~ L -1 mol 31fq~3l~~~~~~~~~~~ Ci) 13. of ~ the the : a re Identify constant reaction? understand ~ 12. -- 2 . d -orbital s ame t he w ith w hile f t he ollowing: agent. (ii) ~ M n3+ ~ ~ ~ # ~ I ~ d ~ $ ( d4) d -31Tffi~ ~ ~ ~ - m # # , ~ - t - t ( ( l) 2 aq) H 2O H + + + ( ( aq) equations: aq) 8 2 3 F e2+ Mn2+, Fe3+ and s olution. a queous a n i n s 2 table n Cr3+, ~:q~~ ~ following: OR i s i on ( Unlike ~ : ~ 9 )uft $ 9 )uft ~ + 2- + ( ( aq) aq) chemical for the I) C (i) reasons u 8tate ~ ~ , ~ 4 C M following r20~- ( nO - M ~I 31T - qR"rT ~ (ii) ~ the ii) )i (i) Complete ~ 31'rT.\I~-q; -a:q .\ 1.fq;j -cn T1 m ~ ~ ~ " ~~ ~ Cr2+ ot (i) , is an oxidising serIes. q)RUT ~I~~ 16. n (d4) Mn3+ In a transition series of metals, the metal which exhibits the greatest num.ber of oxidation states occurs in the middle of the ~ (ii) ature f or i n a ccount r educing y ou i s w ould C r2+ H ow (i) 1 5. configuration the subsequent other M2+ ions of s pecies. - t - t ( ( aq) l) : c ationic H 2O H + + + ~ s table 1 ( aq) { aq) F e2+ 8 2- 2 3 + iUT ~ . f orm n ot d o ~ + ( aq) ( 4 aq) ~ m C r20~- M - n? ( ( 1) . ii) \ \ ~I~~ Cf>~ generally the 3d series of elements, the 4d and the 5d series metals , 31~ : ... ~ ~~~~ ~~I~I~a:~~ 5 4 d ~ $ ~ M 2+ # ~I ~ m-cn ~ ~ F #~ e3+ C r3+, 9 ~ M : ~ n2+, ~ )uft 3 d ~ 5 d~$ ~ ~ (ii) 56/1 "q)RUT Cu (I) ~ # ~I~~ $ (i) I P.T.D. 6 ~ hydroxide ~ water. mm State ~ ~ f Cfi l fqT ~ ~ ~ ~ non-electrolyte, ~ these ~ ferric ~ ~ ~ m g C . 2 5 a t t orr 0 .335 o f p ressure o smotic a n i n f ragment g ene a o f m g 8 .95 d issolving ~ ~ ~ . q ~ " 'qR I ~ ~ 3 :tw 2 R NA. a nd D NA b oth t o c ommon a re w hich t he O f R NA. a nd D NA b etween d ifference s tructural m ain t he W rite ~ f q~ ~ l ~~ (ii) ~ ~ ~ (i) : ~ ~ ~ ~ ~ ' ~ f';~ , -'..,... ~i~~" ~ to q of rf each : added is sTffi of . medium q ~~ I I ~ 8 .95 a ~ example s dispersion ol a t is I is orr ~ fragment ~ ~ NaCl) ~ (say ~ ~ ~ ~-q-1I~<;t} t hose n ame b ases, four peptide linkage (ii) ~ ~ ~~I-1 0 .335 ~ b y R NA.q ~ DNA (i) 1~~I~I~.s OR an ~ t hrough write C the fI1T<;t}(UI w hen gene ~ 3t~ ~ p h as p repared s olution A ~~~~.q'Qr(!:~~ W ~ electrolyte assed where ~ ~ the N i s ~ . q w ater o f m L 35.0 ~ aCl) " i:t>1~ ~ and ~ I ~ (I~(Un ~ m L 3 5.0 ~ ~ R~I~I~d ( m m o bserved colloids ~ l i s characteristics ight o f C 2 ~37{~ ~,~ 31fUTq (~) 5 ~ that V:m:r an ~ w hat Classify ~ b eam Explain Assuming ~ f Cfi ~ a (ii) ~ ~ ~ .q ~ <:.I~(UI 'q~ 18. ~ ~ ~ ~ ~ ~-~ (iii) M ~I~I (i) ~ (i) 20. ~~m~~M~.q~~~~~ (ii) molar ~ (iii) 19. -m Ei\ii; 56/1 "' --- ... 1 8-. 17. Explain what is meant by the following: 2 pyranose structure of glucose I calculate its mass. their classes. an electric current is passed through a sol sol ,,' ~ , Both 02 and F 2 stabilize high oxidation N O;. i n b ond 0 - N t he t han " ,,\ i ~ W 3 f ollowing: s horter H i s 2O. t he f or t han N O; i n a b ond 0 cidic a ccount Y OU m ore - i (iii) N s w H T he 2S H ow (ii) (i) 1. , ould c...'~;~ ",;~,: states but the ability of oxygen to stabilize the higher oxidation state exceeds that of ~ ~ ~ I ~ ~ m m ~ ~ ~ ~ I ~ "iI; ~ 3 1"CfT!lJ.T311 N -O ~ ~ ~ N ~ m O; 3 1f'/;:{qi : ~ ~ H 2S ~ 2 N -O the following terms giving a suitable example in each case: (i) Ambident (ii) (iii) Denticity field aslplitting of igand Crystal in an octahedral 3 field ~~~~~~~~I Explain F ~ ~ ~ ~ ~ ~ H 2O N 0 2 (iii) O; (i) (ii) 22. ~ fluorine. ~~fctft9""(1: l igand) order of 3 sets in d 2-Bromo-2-methylbutane, (ii) following ~ of each of the isplacement: ~ ~ ( S ~ compounds N2 ~ Denticity) ( Ambident ~ t owards (i) ~ ~ " 3cq~ 31~'t:fi~ Rearrange the (iill reactivity 23. ~ (ii) (i) ~~~~f;{~~~~~~~: ligand l-Bromopentane, 2-Bromopentane l-Bromo-3-methYlbutane,2-Bromo-2-methYlbutane, 3-Bromo-2-methylbutane 2-~-2-il~~~~' (ii) (iii) 56/1 1-~~~' 1-~-3-il~~~~' l-~m~~, . 2-~~~ 2-~-2-~~~~' 3-~-2-~~~~ 1-~-2,2-~~~' 1-~-2-ilf~~~~ 7 p.T.G. . (i) l-Bromo-2,2-dimethylpropane~ ~ ~ ~~~~~~~SN2~~~~~~~: t; ;. l-Bromobutane, l-Bromo-2-methylbu~ane - \ (iii) I P ~ \!ft';:r (i) R~I~I{gd T eflon (iii) Draw (i) Polythene VC (iii) )jl~fq~ structures -q:q~-1i~ of the monomers of the following I polymers: I I I water. soluble in j m ethylamine. f or t hat t han m ore i s following: ~~~ ~~"CfIT ~ : ~ ~~ , . not ~ a mines. is I t ertiary t han aniline ~ ~ 3 1f"i:"fq; ~ p oints whereas ~ ~ 3 water Tfi.:rCfI ~ i in tr~~ b oiling soluble ~ 3 1~ is h the igher a niline 2 -itf?:r~-2-~ ~ ~ ~ (i) : ~ ~ ~ from ~ ' h ave ~ ~ itr~~~J-1I~I~"i qjT : f or ~ -2-~ ~ ~ (iii) Propan-2-o1 ~ ~~~~"iI-1 p a mines v alue for Kb ~ q reasons ~ 1-1~I~I{gd :jT\UT Ethylamine p Kb (ii) ~ P rimary (i) 31fq" R~I~I{gd ~ ~ - (i) Q:R'ffio;r (iii) State ~ (ii) (ii) j P the (ii) (iii) b romide m ethylmagnesium f rom 2 -Methylpropan-2-o1 (ii) from f of 56/1 VC (ii) 26. ~ (iii) 25. Benzoquinone ~ --~-- (i) phenol propene ~~II~-1I-1 3 ~ if~~ ~~ "Q:~ if";f/J I ~~ 3 11 I 8 3 f ollowing: t he o btain y ou w ould H ow 2 4. . ~ ~ 3:r~ 56/1 -~J~I. 9 V ( l), H . I ;r ' :i, ( aq) H + M : ;;;e:' . : ~;~r;': ~ 3 1~ ~ ~ ~-fif~ 2O 1 0-4 I i V ) ~ potential. j~,' ~ ';: - q'{ ~ " q:jT1=f ~ ~ 1 .66 0 5 f _: : c urrent.. e lectric a n g enerates c ell t he ~ ~.,:, t he f or e quation a n W rite M ). ~ , h alf-cells f ollowing t he w ith C 2 5 h ours? 3 f or A 2 .00 o f c urrent a w ith e lectrolysing b y p roduced b e w ill m ercury OR 5 V . 1 .33 = E o a s g iven i s p otential ( l), H 2O 7 + ( a~) C r3+ 2 ~ e - 6 + ( aq) H + i s ( aq) H + M 1 0-4 x 1 .0 a nd ( aq) C r3+ M 0 .20 ( aq), ~ Calculate the potential for half-cell containing 0.10 Cr207 3 -Q:;c:Tfu:s (Antacids) 1-q~ ~ I ~ ..1~I~(UI 7 E V , ,-- . x 1 .0 ~ -:qT11"q;)" ~ ? AI = + ( aq) ~ ~ ~ AI 1 ~ ( aq) ~ ~ a t u p e lectrode M " &ro ~-~ .33 C r3+ 2 C r3+ M 3+/ = E ~ o 'f)11"l~ ~ ~ N i2+(0.50 o f r eaction h alf-cell The "SI"q:jR"q)T , ~ "SI"q:jR ~~ ~ e - '11\q)I~(l ~ 6 =0 cell + ~ . 1 . 1 .25 w hen s olution 1 4 + ( aq) Cr20~- ~ ~?~ ~ 0 .20 2+/ F the ;;,~ = 200.6 ( s et s tandard t he and (ii) (iii) aq) " SI"q:jR N a nd i s m oles m any H ow Food f 31tf-~ ~~ 3 ~ . 1~~ - q'{ o ccurs M ) H g(NO3)2 M 1.0 (i) cfi:rq . .~_. ( aq), determine H I "q)T g~g 0 c ell v oltaic A (iii) ~ N E t hat Al3+(0'001 ~~~~d + 1 4 "'-~.;: ~ c tI ( .j I reaction (ii) ~ t ~ ~ (Given: [Hg(NO3)2 ~ I \,I~~ ~ ~ ~ ~ ~s ~ Cr207 ~ ~ (i) ~ + ( aq) i ~Fi_,. ~ ~ and " 4 .,. M Q, (b) ~ 0 (b) .10 28. (a) ~-~~ ql~ (a) 1"i~I~I~d J:rR'"q:j Cr20~- (b) " ~ ~ (a) 3 e ach. o f e xample o ne G ive s ubstances? f ollowing t he a re W hat 27. --- Synthetic detergents Antacids preservatives What type of a battery is lead storage battery? Write the anode and cathode reactions and the overall cell reaction occurring in the operation of a lead storage battery. g mol-I] '::::~~ r~.;!; ,t " , ~\;: '. .'~'. f . ~;, . :_~~ft:c "~ '." P.T.D. ! \ i Hg(N03)2'~ M 1 .0 * ~ ~ ~ ~ ~ A 2 .00 ' f(;nr; ~ ~ ( a) -, 3 .I (i) ? W : ~ ~ " \jf) ' \jffifT V ) 1 .66 BrF3 ~ P H3 equations: 4 5 ~ H H2SO4 2O 4 chemical molecules: w hen h appens W hat (a) OR X + eF S03 (iii) (ii) + H the following gCl2 (i) Complete of the following - = E ~3+/Al V , 0 .25 (HP03'3 (ii) (b) the structures - = I ~ ~ ~ ~ 1.i1~{UI ' q:jT ~ ~ 3 =1~ ~ 3 fff-~ ~ M ). ~ C E ~i2+/Ni : ~ Draw + (a) ~ (~ 29. 1T w i c :: I ~ d ' q:jT W ~ ~ ~ m ~ ' 2 5 N i2+(O.50 q ;1 ~ ~ M ) ' q1~ g mol-!] ~~~~~~mm~~~'q:jT~~~ Al3+(0.001 ~ \jffifT ~ 3 1f:ff1G;;r - = 200.6 [Hg(N03)2 (b) ; ~ ' q:jT ~ " (i) What is the basicity (ii) Why does fluori:ne of H3P03 and why? not play the role of a central atom in ! p oints? b oiling l ow h ave g compounds? ases n oble d o W hy (iii) interhalogen 56/1 solution following: v the ery Answer a hot concentrated ? sulphur dioxide gas is passed through an aqueous solution of a Fe (III) salt? N (ii) (b) gas is passed through aOH chlorine of (i) 5 10 -- -~ '- .. .~IIIIIIII ,",",", ~ (a) R~I~I(gd 3:j1J]ift i:fi1 (i) (b) ~. : 31RfuJ"(f (HP03)3 (ii) ~ ~~ c",- BrFs Irj~I~I(gd ~1~1~lrjctl ~l1lct1~Un (i) HgCl2 (ii) 1[{T ~ : S03 + H2SO4 ~ (iii) ~ + PH3 ~ XeF 4 + H2O ~ a:r~ (a) ~ ~~ 'q:<:rT oH ~ ~ (i ) Na (ii) Fe (III) ~ 1T{!:I" ~~ ~ i:fi1\3fT"ffi ? ~ # "CR'!l-U-;:r ~ ~ ~ #~ ~~ ~~~ ~ i:fi1 \3fT"ffi~? ~ H3P03 i:fi1 ~ (ii) ~~~I~~I'.31rj ~ (iii) (basicity) ~ ~~ ~ ? 'q:<:rT -q"{J:JTUJ i:fi1 ~ # ~ifrf:rri, ~ m (i) : m ~ ~ ~ ~ R~I~I(gd ~ (b) ? ~ (~) ~ ~ ~~rjictl~ ~ ~ ~ ~ ,? (i) (ii) (b) How Cannizzaro's you But-2-enal (ii) Butanoic (iii) Benzoic reduction obtain the from " ethanal acid. from acid following: from butanol ethylbenzene 5 OR (i) r reaction Clemmensen would eactions: n ame f ollowing t he I llustrate ( a) 30. ',.c~,;; (a) Give chemical tests to distinguish between (i) 56/1 Benzaldehyde following: Benzoic acid and ethyl benzoate (ii) the and acetophenone 11 P.T.D. p roducts o r r m ~ h eat ~ C 6H5CHO (ii) H2NCONHNH2 C OOH ~ I COOH (( S following: OCl2 the (i) in issing g iving (b) Completesynthesis each by eagents ""':- ~ : ~ ' ~ ~ ~ ~ : ~ - - ~ ~~ I~(gctl( ~ ';jJf -;r ~ ~ 2 N CONHNH 2 H ~ ~ S OCl2 COOH C OOH I ~ 0= CH2 ~0- CHO 12 ~~i C 6H5CHO ~ : 31~ ~ 1 uf - qj) ~~ (i) (ii) (iii) q~ ~ ~~IGI~I-1I-1 ~ -ij ~~ Rk"fl~l(gd (( 56/1 (1~I~RctI ~~~~~~ R (i) ~~I('".s~I~.s (ii) (b) ~ CfiG~ ~ # k"fl~R9d (a) qj) 3t~ ~ ~ ~~ ~ ~1~~~~I-1 (iii) 5rTl:{f ~ a :rrq ~-2-~ ~ - d R 9 ~ ~ ~ ~ I k "f R (i) (ii) ~~-q~-1 qj) ~1~~-1 (ii) (b) ~ t mro (i) d~I~(UI 5 : ~ l-1k"fl~l(gd ';fT1=f 'CiRYit 31T ~ (a) ~ (iii) 0= CH2 ~0- CHO - ~~,~;qj~r.;l:\;;;"; '-,: "J.,

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