chem 18 sol

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SAMPLE PAPER-02 (solved)

CHEMISTRY (Theory)

Class XII

Answers

1.

2.

3-Phenylpropanoic acid.

3.

i.

(CH3)2CHCH2CH2Cl

ii. (CH3)2CHCH(Cl)CH3

iii. (CH3)2C(Cl)CH2CH3

iv. CH3CH(CH2Cl)CH2CH3

. I! i" a non-pro!ein por!ion o#!ained #y hydroly"i" o$ con%&'a!ed pro!ein". The ain $&nc!ion o$

!he pro"!he!ic 'ro&p i" !o con!rol !he #iolo'ical $&nc!ion o$ pro!ein".

.

Thi" i" d&e !o !he proce"" o$ a&!oca!aly"i". In !he #e'innin' o$ !he hydroly"i" o$ e"!er 'ive" an acid*hich "!ar!" a" a ca!aly"! la!er and "o+ !he reac!ion #ecoe" $a"!.

,. The iron o#!ained $ro #la"! $&rnace i" pi' iron. I! con!ain" a#o&! o$ car#on and any

ip&ri!ie" in "all ao&n!. Ca"! iron i" o#!ained #y el!in' pi' iron *i!h "crap iron and coe

&"in' ho! air #la"!. I! con!ain" "li'h!ly lo*er car#on con!en! and i" e/!reely hard and #ri!!le.

0.a) The reac!ion #e!*een *a!er and aldehyde" i" a rever"i#le reac!ion and "o e&ili#ri& lie"

alo"! !o*ard" le$!. n !he o!her hand+ in chloral !he pre"ence o$ !hree elec!ron *i!hdra*in'

chlorine a!o" increa"e" !he po"i!ive char'e on !he car#onyl car#on. So+ !he *ea

n&cleophile" readily add !o !he car#onyl 'ro&p $orin' chloral hydra!e and !here$ore "hi$! !he

e&ili#ri& !o*ard" ri'h!.

#) ce!ic acid can #e halo'ena!ed d&e !o !he pre"ence o$ 4-car#on a!o. Ho*ever+ $oric acid

ha" no 4-hydro'en a!o and "o canno! #e halo'ena!ed.

5. Sca diver" &"! cope *i!h hi'h concen!ra!ion" o$ di""olved 'a"e" *hile #rea!hin' air a! hi'h

pre""&re &nder*a!er. Increa"ed pre""&re increa"e" !he "olili!y o$ a!o"pheric 'a"e" in #lood.

6hen !he diver" coe !o*ard" "&r$ace+ !he pre""&re 'rad&ally decrea"e". Thi" relea"e" !he

di""olved 'a"e" and lead" !o !he $ora!ion o$ ##le" o$ ni!ro'en in !he #lood. Thi" #loc"

capillarie" and crea!e" a edical condi!ion no*n a" #end"+ *hich are pain$&l and dan'ero&" !o

li$e.

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7.

Thi" de$ec! i" "ho*n #y ionic "olid". The "aller ion (&"&ally ca!ion) i" di"loca!ed $ro i!" noral

"i!e !o an in!er"!i!ial "i!e. I! crea!e" a vacancy de$ec! a! i!" ori'inal "i!e and an in!er"!i!ial de$ec! a!

i!" ne* loca!ion. 8renel de$ec! i" al"o called di"loca!ion de$ec!. I! doe" no! chan'e !he den"i!y o$

!he "olid. 8renel de$ec! i" "ho*n #y ionic ""!ance in *hich !here i" a lar'e di$$erence in !he "i9eo$ ion"+ $or e/aple+ :nS+ 'Cl+ ';r and 'I d&e !o "all "i9e o$ :n20.7@1>-3' ol?1

Ed'e len'!h o$ &ni! cell = a = >5., p = >5.,@1>?12

3

.

.A

z MDensity d

a N=

( )( ) ( )

3 1

3 3

312 23 1

4 107.9 10 10.5 10408.6 10 6.022 10

x x kgmol x kgmx m x mol

= =

= 1>. 'Ac3.

1>.i.

rder o$ a reac!ion i" an e/perien!al &an!i!y. I! can #e 9ero and even a $rac!ion #&!olec&lari!y canno! #e 9ero or a non in!e'er.

ii. rder i" applica#le !o eleen!ary a" *ell a" cople/ reac!ion" *herea" olec&lari!y i"applica#le only $or eleen!ary reac!ion". 8or cople/ reac!ion olec&lari!y ha" no eanin'.

iii. 8or cople/ reac!ion+ order i" 'iven #y !he "lo*e"! "!ep and olec&lari!y o$ !he "lo*e"! "!epi" "ae a" !he order o$ !he overall reac!ion.

11.

a)

In !he 'iven olec&le+ !here are $o&r di$$eren! !ype" o$ hydro'en a!o"+ "o !he

replaceen! o$ !he"e hydro'en a!o" *ill 'ive !he $ollo*in' i"oer"+

(CH3)2CHCH2CH2Cl (CH3)2CHCH(Cl)CH3

(CH3)2C(Cl)CH2CH3CH3CH(CH2Cl)CH2CH3

#) Since "&lph&ric acid i" an o/idi9in' a'en!+ i! o/idi9e" HI prod&ced d&rin' !he reac!ion+

!here#y preven!in' !he reac!ion !o $or alyl iodide.

c)

lyl halide" are polar olec&le" and "o !heir olec&le" are held !o'e!her #y dipole ?

dipole $orce". ;&! !he olec&le" o$ *a!er are held !o'e!her #y hydro'en #ond". 6hen

alyl halide" are added !o *a!er+ !he $orce o$ a!!rac!ion #e!*een *a!er and alyl halide

olec&le" are *eaer !han !he $orce" o$ a!!rac!ion already e/i"!in' #e!*een alyl halide-

alyl halide olec&le" and *a!er ? *a!er olec&le". Hence alyl halide" are ii"ci#le

*i!h *a!er.

12.

S&lph&r dio/ide can #e de!ec!ed #y !he $ollo*in' !e"!"B

a)

I! ha" a p&n'en! charac!eri"!ic "ell.

#) I! decolo&ri"e" acidi$ied po!a""i& peran'ana!e "ol&!ion.

c) I! !&rn" #l&e li!&" !o red.

d) I! !&rn" acidi$ied po!a""i& dichroa!e "ol&!ion 'reen.

13.

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Molar a"" o$ CH2Cl2= 12 / 1 < 1 / 2 < 3. 2 = 5 ' ol?1

Molar a"" o$ CHCl3= 12 / 1 < 1 / 1 < 3. 3 = 117. ' ol -1

Mole" o$ CH2Cl2=

40

0.4785 = ol

Mole" o$ CHCl3=25.5

0.213119.5

= ol

To!al ner o$ ole" = >.,53 ol

2 2CH Cl

0.47x = = 0.688

0.683

3CHClx = 1.>> ? >.,55 = >.312

"in' e&a!ion+0 0 0

total 1 2 1 2( )x = +

= 2>> < (1 ? 2>>) >.,55 = 30.7 H'1.

a) 3 H'Cl2< 2 PH3H'3P2 < , HCl

#) 2 DaCl3< I22 DaI3< Cl2

c) 2 SCl2 < Da8S8< DaCl < S

1.a) car#ohydra!e !ha! canno! #e hydroly"ed $&r!her !o 'ive "ipler &ni! o$ polyhydro/y

aldehyde or e!one i" called a ono"accharide.

#) Car#ohydra!e" !ha! yield !*o !o !en ono"accharide &ni!"+ on hydroly"i"+ are called

oli'o"accharide". They are $&r!her cla""i$ied a" di"accharide"+ !ri"accharide"+

!e!ra"accharide"+ e!c.+ dependin' &pon !he ner o$ono"accharide"+ !hey provide on hydroly"i".

c) Car#ohydra!e" *hich yield a lar'e ner o$ ono"accharide &ni!" on hydroly"i" are

called poly"accharide".

1,.""&e !ha! *e have 1>> ' o$ "ol&!ion. Sol&!ion *ill con!ain 2> ' o$ e!hylene 'lycol and 5> ' o$

*a!er.

Molar Ma"" o$ C2H,2= 12 2 < 1 , < 1, 2 = ,2 ' ol-1

2 6 2 -1

20gMoles of C H O = =0.322mol

62gmol

-180gMoles of water= =4.444mol

18gmol

2 6 2glycol

2 6 2 2

moles of C H Ox =

moles of C H O +moles of H O

0.3220.068

0.322 4.444

mol

mol mol= =

+

water

4.444 molSimilarly x = =0.932

0.322 mol+4.444 mol

10.

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a)

CoCl2(DH3)F>G and 0>>G are >.>2"?1and >.>0"?1re"pec!ively.

15.

2 2 1

1 1 2

log2.303

aEk T T

k R T T

=

1 1

0.07 700 500log

0.02 2.303 8.314 700 500

aE

x JK mol x

=

>. = Ea/ .01 / 1>-A 17.1

Ea= >. / 17.1 A .01 / 1>-= 1523>.5

Since = e-EaART

>.>2 = e-1523>.5A5.31/>>

= >.>2A>.>12 = 1.,1

17.

lo#&lar pro!ein" 8i#ro&" pro!ein"

The"e pro!ein" are cro"" linedconden"a!ion prod&c!" o$ #a"ic and acidicaino acid".

The"e pro!ein" are linear conden"a!ionprod&c!".

The"e are "olle in *a!er and in"olle in"!ron' acid" and #a"e".

The"e are in"olle in *a!er #&! are"olle in "!ron' acid" and #a"e".

I! incl&de" all en9ye" and horone". I! incl&de" #i$roin in "il+ colla'en in!endon"+ yo"in in &"cle" and era!in inhair.

2>.

;a"ed on !he "!r&c!&re+ polyer" are cla""i$ied in!o !hree !ype" naely+

a. Jinear polyer"

#. ;ranched chain polyer"

c. Cro"" lined polyer"

Jinear polyer"

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The"e are polyer" in *hich onoeric &ni!" are lined !o'e!her !o $or lon' and linear

chain". E/aple ? PKC.

;ranched chain polyer"

The"e are polyer" in *hich onoeric &ni!" are %oined !o'e!her !o $or chain" *i!h "idechain" or #ranche" o$ di$$eren! len'!h". E/aple ? "!arch.

Cro"" lined polyer"

The"e are polyer" in *hich onoeric &ni!" are cro"" lined !o $or a !hree

dien"ional ne!*or. E/aple ? ;aeli!e.

21.Lr&'" are cla""i$ied a" $ollo*"B

a) n !he #a"i" o$ pharacolo'ical e$$ec!.

#) n !he #a"i" o$ ac!ion on a par!ic&lar #iocheical proce"".

c) n !he #a"i" o$ cheical "!r&c!&re.

d)

n !he #a"i" o$ olec&lar !ar'e!".

22.

Ideal "ol&!ion Don-ideal "ol&!ion

The in!erac!ion" #e!*een !he coponen!"are "iilar !o !ho"e in !he p&recoponen!".

The in!erac!ion #e!*een !he coponen!"are di$$eren! $ro !ho"e in !he p&recoponen!".

There i" no en!halpy chan'e on i/in'. There i" en!halpy chan'e on i/in'.

There i" no vol&e chan'e on i/in'. There i" vol&e chan'e on i/in'.

23.

a. Thi" proce"" i" called Rever"e ?o"o"i" (R).#.

n ipor!an! applica!ion o$ rever"e o"o"i" i" !he de"alina!ion o$ "ea *a!er. "copared !o o!her e!hod"+ R i" ore appealin'+ a" i! doe" no! involve a pha"echan'e and i" econoically "o&nd $or lar'e ao&n!" o$ *a!er.Sea *a!er i" appro/ia!ely >.0 M in DaCl+ ha" an addi!ional ,> a! *o&ld have !o

#e applied on !he "ea *a!er-"ide copar!en! !o ca&"e rever"e o"o"i".

2.

a.

CHDH

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(LI;J ? H)B (Lii"o#&!yl) al&ini& hydride

e.

CHDH

chem 18 sol

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