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Past Year Paper, Chemistry (Set - 2 ), Delhi, 2014, Class 12, Chemistry | Additional Study Material for Class 12 PDF Download

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 Page 1


Series : OSR/I
+nt.
Roll No.
fr?ttfu$qzt: 3 
qoq
Time allowed:3 hours 
l
fits'i.
Code No.
s6lu2
+tssi Efi
Tq-YlE
rr{ qErs 
flerii r
Candidates must write the Code on
the title page of the answer-book.
o 
Str-{r 
sirq 
+'rd flq,'vs 
qqtrr-Er 
{ 
Ilrf, 
ge 
11 t r
o Irsr-wr { 
qrf6+ 
6rq 6t sil{ fqq.rq 
qilsqq{s} 
urd ffi{-gks, *Ee-ys.nflad r
o gtrqrd,'qq,ri{t+'qsqq"r-Erii 
so snt r
o 
SrFlTtlFT6,rsir{frs{rvJ{"^6,r++qtrd, 
qf{6'rf,qi6^ 
wqqqftrd r
. 
Es trlcr-q:r si 
qo+ 
+ fdq 15 fiT{e 
irr 
{Er{r fEqr 
.rqr 
t r 
yqr-.H 
*r fl+etq gqlqr it 
to. ts 
qQ
f*qr 
qr+qT 
r 10.15 
qq 
t 10.30 
qQ 
aq; sa **o 
qsr-wr qfi 
Gil{ qs 
erqfrr + d{H * src-
gksTqr+ttr+rqtTfuidt 
r
o 
Please check that this question paper contains 11 printed pages.
o 
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.
o 
Please check that this question paper contains 30 questions.
o 
Please write down the Serial Number of the question before attempting it.
I 
15 minutes time has been allotted to read this question paper. The question paper will be
distributed at 10.15 a.m. From 10.15 a.m. to 10.30 a.m., the students will only read the
question paper and will not write any answer on the answer-book during this period.
rqTFI"TfrTTl-q(+qrP,ffi)
CHEMISTRY (Theory)
nrm{frT+vr:
(i) afiswatMt r
(ii) vnr-viglrt dA aa-'arfr ag-eat\+rwS 1yfionw #forr 
,:r*,'i 
r
(iii) sFr-tiqr9 *rc d-aag-irmbrr+|. tsdrwr*fdqz er+-d- I
(iv) 
ymr<iqr 
t9 lzz tqtt? ag-eatfu rw t r s-d€y?a #frr<rt or+'* I
(v) 
yw-tiqrzt 
tso 
q?d-wtqrrs# 
rs-dtyw#ftzqrs eras I
(vi) 
qrqwadllsTrfrq*wif 
wsqhr n+ / 
@ 
#swhT+? etpfu 
m?* r
pftrqdq etq 
:70
I 
Maximum Marks : 70
s6fit2
[P.T.O.
Page 2


Series : OSR/I
+nt.
Roll No.
fr?ttfu$qzt: 3 
qoq
Time allowed:3 hours 
l
fits'i.
Code No.
s6lu2
+tssi Efi
Tq-YlE
rr{ qErs 
flerii r
Candidates must write the Code on
the title page of the answer-book.
o 
Str-{r 
sirq 
+'rd flq,'vs 
qqtrr-Er 
{ 
Ilrf, 
ge 
11 t r
o Irsr-wr { 
qrf6+ 
6rq 6t sil{ fqq.rq 
qilsqq{s} 
urd ffi{-gks, *Ee-ys.nflad r
o gtrqrd,'qq,ri{t+'qsqq"r-Erii 
so snt r
o 
SrFlTtlFT6,rsir{frs{rvJ{"^6,r++qtrd, 
qf{6'rf,qi6^ 
wqqqftrd r
. 
Es trlcr-q:r si 
qo+ 
+ fdq 15 fiT{e 
irr 
{Er{r fEqr 
.rqr 
t r 
yqr-.H 
*r fl+etq gqlqr it 
to. ts 
qQ
f*qr 
qr+qT 
r 10.15 
qq 
t 10.30 
qQ 
aq; sa **o 
qsr-wr qfi 
Gil{ qs 
erqfrr + d{H * src-
gksTqr+ttr+rqtTfuidt 
r
o 
Please check that this question paper contains 11 printed pages.
o 
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.
o 
Please check that this question paper contains 30 questions.
o 
Please write down the Serial Number of the question before attempting it.
I 
15 minutes time has been allotted to read this question paper. The question paper will be
distributed at 10.15 a.m. From 10.15 a.m. to 10.30 a.m., the students will only read the
question paper and will not write any answer on the answer-book during this period.
rqTFI"TfrTTl-q(+qrP,ffi)
CHEMISTRY (Theory)
nrm{frT+vr:
(i) afiswatMt r
(ii) vnr-viglrt dA aa-'arfr ag-eat\+rwS 1yfionw #forr 
,:r*,'i 
r
(iii) sFr-tiqr9 *rc d-aag-irmbrr+|. tsdrwr*fdqz er+-d- I
(iv) 
ymr<iqr 
t9 lzz tqtt? ag-eatfu rw t r s-d€y?a #frr<rt or+'* I
(v) 
yw-tiqrzt 
tso 
q?d-wtqrrs# 
rs-dtyw#ftzqrs eras I
(vi) 
qrqwadllsTrfrq*wif 
wsqhr n+ / 
@ 
#swhT+? etpfu 
m?* r
pftrqdq etq 
:70
I 
Maximum Marks : 70
s6fit2
[P.T.O.
General Instructions
(i) All questions are compulsory.
(ii) 
Question 
numbers 1 to I are very short-answer questions and carry 7 mark each.
(iii) 
Question 
numbers 9 to 18 are short-answer questions and carry 2 marks each.
(iv) 
Question 
numbers 19 to 27 are also short-answer questions and carry 3 marks
each.
(v) 
Question 
numbers 28 to 30 are long-answer questions and carry 5 marlcs each.
(vi) tJse l-og Tables, if necessary. Use of calculators is not allowed.
1. da (sol) 
glh-+d 
Gel) 
trT 
\rs-qqtsqrtruTt 
| 
1
Give one example each of sol and gel.
2. ftwftnaqris+ftiq{+erqw.tqiw+1fifiil+ffi 6}at errqrqs'ErBr*rrfuqrqmrt ? I
Which reducing agent is employed to get copper from the leached low grade copper
ore ?
3. Frq dtrou IUPAC 
qFT 
ftrdi :
cH.-9H-CHz-CHO
"l
NH2
Write the IUPAC name of the compound
cH"-cH-cH2-cHo
,l
NHz
4. rq 
oTr{€tq{i 
tsq-qffiM.) 
{ t 
q+{ qr 
efir*'qlqvftd 
t t
q-qr{ifu{d eiq p-qr{dtFfrm
Which of the following isomers is more volatile :
o-nitrophenol or p-nitrophenol ?
s. 
56 
rq lqDm H 
qr+ y{'Qffi{e' q{r} 
t I Tr 
tfv+*tq 
wr t}* t t
Some liquids on mixing form 'azeotropes'. What are 'azeotropes' ?
6. Frq 
q\ffi 
s) {6fi 
Ei^q{rfto,,,dr 
*-mq { 
qqfsm 
dfsr+ :
c6HsNH2, C6H5NHCH3' C6H5CHTM'
Arrange the following in increasing order of basic strength :
6H5NH2, 
C6H5NHCH3' C6H5CH2NH2
56m2 
'2
Page 3


Series : OSR/I
+nt.
Roll No.
fr?ttfu$qzt: 3 
qoq
Time allowed:3 hours 
l
fits'i.
Code No.
s6lu2
+tssi Efi
Tq-YlE
rr{ qErs 
flerii r
Candidates must write the Code on
the title page of the answer-book.
o 
Str-{r 
sirq 
+'rd flq,'vs 
qqtrr-Er 
{ 
Ilrf, 
ge 
11 t r
o Irsr-wr { 
qrf6+ 
6rq 6t sil{ fqq.rq 
qilsqq{s} 
urd ffi{-gks, *Ee-ys.nflad r
o gtrqrd,'qq,ri{t+'qsqq"r-Erii 
so snt r
o 
SrFlTtlFT6,rsir{frs{rvJ{"^6,r++qtrd, 
qf{6'rf,qi6^ 
wqqqftrd r
. 
Es trlcr-q:r si 
qo+ 
+ fdq 15 fiT{e 
irr 
{Er{r fEqr 
.rqr 
t r 
yqr-.H 
*r fl+etq gqlqr it 
to. ts 
qQ
f*qr 
qr+qT 
r 10.15 
qq 
t 10.30 
qQ 
aq; sa **o 
qsr-wr qfi 
Gil{ qs 
erqfrr + d{H * src-
gksTqr+ttr+rqtTfuidt 
r
o 
Please check that this question paper contains 11 printed pages.
o 
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.
o 
Please check that this question paper contains 30 questions.
o 
Please write down the Serial Number of the question before attempting it.
I 
15 minutes time has been allotted to read this question paper. The question paper will be
distributed at 10.15 a.m. From 10.15 a.m. to 10.30 a.m., the students will only read the
question paper and will not write any answer on the answer-book during this period.
rqTFI"TfrTTl-q(+qrP,ffi)
CHEMISTRY (Theory)
nrm{frT+vr:
(i) afiswatMt r
(ii) vnr-viglrt dA aa-'arfr ag-eat\+rwS 1yfionw #forr 
,:r*,'i 
r
(iii) sFr-tiqr9 *rc d-aag-irmbrr+|. tsdrwr*fdqz er+-d- I
(iv) 
ymr<iqr 
t9 lzz tqtt? ag-eatfu rw t r s-d€y?a #frr<rt or+'* I
(v) 
yw-tiqrzt 
tso 
q?d-wtqrrs# 
rs-dtyw#ftzqrs eras I
(vi) 
qrqwadllsTrfrq*wif 
wsqhr n+ / 
@ 
#swhT+? etpfu 
m?* r
pftrqdq etq 
:70
I 
Maximum Marks : 70
s6fit2
[P.T.O.
General Instructions
(i) All questions are compulsory.
(ii) 
Question 
numbers 1 to I are very short-answer questions and carry 7 mark each.
(iii) 
Question 
numbers 9 to 18 are short-answer questions and carry 2 marks each.
(iv) 
Question 
numbers 19 to 27 are also short-answer questions and carry 3 marks
each.
(v) 
Question 
numbers 28 to 30 are long-answer questions and carry 5 marlcs each.
(vi) tJse l-og Tables, if necessary. Use of calculators is not allowed.
1. da (sol) 
glh-+d 
Gel) 
trT 
\rs-qqtsqrtruTt 
| 
1
Give one example each of sol and gel.
2. ftwftnaqris+ftiq{+erqw.tqiw+1fifiil+ffi 6}at errqrqs'ErBr*rrfuqrqmrt ? I
Which reducing agent is employed to get copper from the leached low grade copper
ore ?
3. Frq dtrou IUPAC 
qFT 
ftrdi :
cH.-9H-CHz-CHO
"l
NH2
Write the IUPAC name of the compound
cH"-cH-cH2-cHo
,l
NHz
4. rq 
oTr{€tq{i 
tsq-qffiM.) 
{ t 
q+{ qr 
efir*'qlqvftd 
t t
q-qr{ifu{d eiq p-qr{dtFfrm
Which of the following isomers is more volatile :
o-nitrophenol or p-nitrophenol ?
s. 
56 
rq lqDm H 
qr+ y{'Qffi{e' q{r} 
t I Tr 
tfv+*tq 
wr t}* t t
Some liquids on mixing form 'azeotropes'. What are 'azeotropes' ?
6. Frq 
q\ffi 
s) {6fi 
Ei^q{rfto,,,dr 
*-mq { 
qqfsm 
dfsr+ :
c6HsNH2, C6H5NHCH3' C6H5CHTM'
Arrange the following in increasing order of basic strength :
6H5NH2, 
C6H5NHCH3' C6H5CH2NH2
56m2 
'2
7. €d'ff dq 
qr 
trm'u-wtg 
+T vndq 
qrrot 
eil{=rm ii qfudq 
t r
Which component 
of starch is a branched polymer 
of o-glucose and insoluble in water ?
8. ftE{ {*,d { * 
qir 
wr €rftrn'en+ 
*il t 
ske} 
r
[Co(NH)6]3* +{ 
[Co(en)r]3+
Which of the following is more stable complex and why ?
[Co(NH)6]3* and 
[Co(en)r]3+
g. 
ffi urftqq fuI r loqft +fi s1ffi rn{ gdwfrildrq{ETqqH 
sr*Trwne*dr 
t r 2
State Henry's law. What is the effect of temperature on the solubility of a gas in a
liquid ?
10. frq 
EI si 
qftqrkd 
fr1Fr+ :
(i) oTFTTS 
@seudo) 
sEq dfe6t srfi{pmur 
r
(ii) 
ffi ernrfrqrm 
ertloro 
ltro).
Define the following terms :
(i) 
Pseudo fust order reaction
(ii) 
Half life period 
of reacrion (ty2).
I t. 
yilT{ 
firqrqf *t frrr frft{rrf + silqrw 
frqq ffi 
.
(i) 
rrqrkfr *qr 
Glydraulic washing)
(ii) 
ilwtFfr ltrrr (Vapourphaserefining)
write the principle 
behind the following methods of refining :
(i) . 
Hydraulic 
washing
(ii) 
Vapour phase 
refining
tz. Frr 
ii 
+ rer 
qfi{PsqT 
{ qp 
+ilH semot drqqr 
M :
(i) 
Gou 
soc/z'
(ii) 
GcHz- 
cH= cH2 +1s1 
ffi*,
Draw the structure of m1j9r monohalo product 
in each of the following reactions :
(i) 
GoH 
soc/2,
(ii) 
GcHz 
- 
cH = cH, + 
1191 
Peroxide,
2
)
s6tu2
lP.T.O.
Page 4


Series : OSR/I
+nt.
Roll No.
fr?ttfu$qzt: 3 
qoq
Time allowed:3 hours 
l
fits'i.
Code No.
s6lu2
+tssi Efi
Tq-YlE
rr{ qErs 
flerii r
Candidates must write the Code on
the title page of the answer-book.
o 
Str-{r 
sirq 
+'rd flq,'vs 
qqtrr-Er 
{ 
Ilrf, 
ge 
11 t r
o Irsr-wr { 
qrf6+ 
6rq 6t sil{ fqq.rq 
qilsqq{s} 
urd ffi{-gks, *Ee-ys.nflad r
o gtrqrd,'qq,ri{t+'qsqq"r-Erii 
so snt r
o 
SrFlTtlFT6,rsir{frs{rvJ{"^6,r++qtrd, 
qf{6'rf,qi6^ 
wqqqftrd r
. 
Es trlcr-q:r si 
qo+ 
+ fdq 15 fiT{e 
irr 
{Er{r fEqr 
.rqr 
t r 
yqr-.H 
*r fl+etq gqlqr it 
to. ts 
qQ
f*qr 
qr+qT 
r 10.15 
qq 
t 10.30 
qQ 
aq; sa **o 
qsr-wr qfi 
Gil{ qs 
erqfrr + d{H * src-
gksTqr+ttr+rqtTfuidt 
r
o 
Please check that this question paper contains 11 printed pages.
o 
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.
o 
Please check that this question paper contains 30 questions.
o 
Please write down the Serial Number of the question before attempting it.
I 
15 minutes time has been allotted to read this question paper. The question paper will be
distributed at 10.15 a.m. From 10.15 a.m. to 10.30 a.m., the students will only read the
question paper and will not write any answer on the answer-book during this period.
rqTFI"TfrTTl-q(+qrP,ffi)
CHEMISTRY (Theory)
nrm{frT+vr:
(i) afiswatMt r
(ii) vnr-viglrt dA aa-'arfr ag-eat\+rwS 1yfionw #forr 
,:r*,'i 
r
(iii) sFr-tiqr9 *rc d-aag-irmbrr+|. tsdrwr*fdqz er+-d- I
(iv) 
ymr<iqr 
t9 lzz tqtt? ag-eatfu rw t r s-d€y?a #frr<rt or+'* I
(v) 
yw-tiqrzt 
tso 
q?d-wtqrrs# 
rs-dtyw#ftzqrs eras I
(vi) 
qrqwadllsTrfrq*wif 
wsqhr n+ / 
@ 
#swhT+? etpfu 
m?* r
pftrqdq etq 
:70
I 
Maximum Marks : 70
s6fit2
[P.T.O.
General Instructions
(i) All questions are compulsory.
(ii) 
Question 
numbers 1 to I are very short-answer questions and carry 7 mark each.
(iii) 
Question 
numbers 9 to 18 are short-answer questions and carry 2 marks each.
(iv) 
Question 
numbers 19 to 27 are also short-answer questions and carry 3 marks
each.
(v) 
Question 
numbers 28 to 30 are long-answer questions and carry 5 marlcs each.
(vi) tJse l-og Tables, if necessary. Use of calculators is not allowed.
1. da (sol) 
glh-+d 
Gel) 
trT 
\rs-qqtsqrtruTt 
| 
1
Give one example each of sol and gel.
2. ftwftnaqris+ftiq{+erqw.tqiw+1fifiil+ffi 6}at errqrqs'ErBr*rrfuqrqmrt ? I
Which reducing agent is employed to get copper from the leached low grade copper
ore ?
3. Frq dtrou IUPAC 
qFT 
ftrdi :
cH.-9H-CHz-CHO
"l
NH2
Write the IUPAC name of the compound
cH"-cH-cH2-cHo
,l
NHz
4. rq 
oTr{€tq{i 
tsq-qffiM.) 
{ t 
q+{ qr 
efir*'qlqvftd 
t t
q-qr{ifu{d eiq p-qr{dtFfrm
Which of the following isomers is more volatile :
o-nitrophenol or p-nitrophenol ?
s. 
56 
rq lqDm H 
qr+ y{'Qffi{e' q{r} 
t I Tr 
tfv+*tq 
wr t}* t t
Some liquids on mixing form 'azeotropes'. What are 'azeotropes' ?
6. Frq 
q\ffi 
s) {6fi 
Ei^q{rfto,,,dr 
*-mq { 
qqfsm 
dfsr+ :
c6HsNH2, C6H5NHCH3' C6H5CHTM'
Arrange the following in increasing order of basic strength :
6H5NH2, 
C6H5NHCH3' C6H5CH2NH2
56m2 
'2
7. €d'ff dq 
qr 
trm'u-wtg 
+T vndq 
qrrot 
eil{=rm ii qfudq 
t r
Which component 
of starch is a branched polymer 
of o-glucose and insoluble in water ?
8. ftE{ {*,d { * 
qir 
wr €rftrn'en+ 
*il t 
ske} 
r
[Co(NH)6]3* +{ 
[Co(en)r]3+
Which of the following is more stable complex and why ?
[Co(NH)6]3* and 
[Co(en)r]3+
g. 
ffi urftqq fuI r loqft +fi s1ffi rn{ gdwfrildrq{ETqqH 
sr*Trwne*dr 
t r 2
State Henry's law. What is the effect of temperature on the solubility of a gas in a
liquid ?
10. frq 
EI si 
qftqrkd 
fr1Fr+ :
(i) oTFTTS 
@seudo) 
sEq dfe6t srfi{pmur 
r
(ii) 
ffi ernrfrqrm 
ertloro 
ltro).
Define the following terms :
(i) 
Pseudo fust order reaction
(ii) 
Half life period 
of reacrion (ty2).
I t. 
yilT{ 
firqrqf *t frrr frft{rrf + silqrw 
frqq ffi 
.
(i) 
rrqrkfr *qr 
Glydraulic washing)
(ii) 
ilwtFfr ltrrr (Vapourphaserefining)
write the principle 
behind the following methods of refining :
(i) . 
Hydraulic 
washing
(ii) 
Vapour phase 
refining
tz. Frr 
ii 
+ rer 
qfi{PsqT 
{ qp 
+ilH semot drqqr 
M :
(i) 
Gou 
soc/z'
(ii) 
GcHz- 
cH= cH2 +1s1 
ffi*,
Draw the structure of m1j9r monohalo product 
in each of the following reactions :
(i) 
GoH 
soc/2,
(ii) 
GcHz 
- 
cH = cH, + 
1191 
Peroxide,
2
)
s6tu2
lP.T.O.
13. (i) f=rng'q+st{*ntftmmtiflEsffi\fi tsiY{orfuq^dd S*2 
erftlmqltntr 
z
nn
Br 
l,
(a) (b)
(ii) tpa ferftrqi 
ii 
s*t ek s*z 
it 
* 
qil{ 
S 
srFltffir 
tt ft t
(a) fuqru 6t rfreil (inversion)
(b) tftrqtfi"r (Racemisation)
(i) Which alkyl halide from the following pair is chiral and undergoes faster S*2
reaction ?
n,\^
Br
(a) (b)
(ii) Out of S*1 and S*2, which reaction occurs with
(a) Inversion of configuration
(b) Racemisation
14. 
qr 
{rsrqFr*,'{FM +} gn *t :
(i) CarPr+ HrO 
->
(i0 Cu + HTSO.G{O 
->
s{slElt
frq 
q\tm'{ffi[ 
o] e=r*,'qrq ffi 
'gw 
sr{qn 
qqf*uiT 
s1H :
(i) HF, HCr, Hgr 
eiltru 
- 
{6fr g$ enc*r ffiqq 
tffi 
or{qr
(ii) H2O, H2S, HrSe 
eilc 
H 
zT" 
-T6fr Ei' 
eTIrfi Hsfrr 
3r1ur
Complete the following chemical equations':
(i) CarPr+ HrO -+
(ii) Cu + HrSOo(conc.) +
OR
Arrange the following in the order of property indicated against each set :
(i) HF, HC/, HBr, HI 
- 
increasing bond dissociation enthalpy.
(ii) H2O, HzS, HrSe, HrTe 
- 
increasing acidic character.
15. ri+"r 
tcr(xH 
3)4clzl+ 
ET IUPAC {rq fud r 
q6t{T 
rsnftt 
qrTr*{r+il 
(isomerism; tcumr
tt
Write the IUPAC name of the complex 
[Cr(NH3)aCl21+. 
What type of isomerism does
it exhibit ?
Page 5


Series : OSR/I
+nt.
Roll No.
fr?ttfu$qzt: 3 
qoq
Time allowed:3 hours 
l
fits'i.
Code No.
s6lu2
+tssi Efi
Tq-YlE
rr{ qErs 
flerii r
Candidates must write the Code on
the title page of the answer-book.
o 
Str-{r 
sirq 
+'rd flq,'vs 
qqtrr-Er 
{ 
Ilrf, 
ge 
11 t r
o Irsr-wr { 
qrf6+ 
6rq 6t sil{ fqq.rq 
qilsqq{s} 
urd ffi{-gks, *Ee-ys.nflad r
o gtrqrd,'qq,ri{t+'qsqq"r-Erii 
so snt r
o 
SrFlTtlFT6,rsir{frs{rvJ{"^6,r++qtrd, 
qf{6'rf,qi6^ 
wqqqftrd r
. 
Es trlcr-q:r si 
qo+ 
+ fdq 15 fiT{e 
irr 
{Er{r fEqr 
.rqr 
t r 
yqr-.H 
*r fl+etq gqlqr it 
to. ts 
qQ
f*qr 
qr+qT 
r 10.15 
qq 
t 10.30 
qQ 
aq; sa **o 
qsr-wr qfi 
Gil{ qs 
erqfrr + d{H * src-
gksTqr+ttr+rqtTfuidt 
r
o 
Please check that this question paper contains 11 printed pages.
o 
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.
o 
Please check that this question paper contains 30 questions.
o 
Please write down the Serial Number of the question before attempting it.
I 
15 minutes time has been allotted to read this question paper. The question paper will be
distributed at 10.15 a.m. From 10.15 a.m. to 10.30 a.m., the students will only read the
question paper and will not write any answer on the answer-book during this period.
rqTFI"TfrTTl-q(+qrP,ffi)
CHEMISTRY (Theory)
nrm{frT+vr:
(i) afiswatMt r
(ii) vnr-viglrt dA aa-'arfr ag-eat\+rwS 1yfionw #forr 
,:r*,'i 
r
(iii) sFr-tiqr9 *rc d-aag-irmbrr+|. tsdrwr*fdqz er+-d- I
(iv) 
ymr<iqr 
t9 lzz tqtt? ag-eatfu rw t r s-d€y?a #frr<rt or+'* I
(v) 
yw-tiqrzt 
tso 
q?d-wtqrrs# 
rs-dtyw#ftzqrs eras I
(vi) 
qrqwadllsTrfrq*wif 
wsqhr n+ / 
@ 
#swhT+? etpfu 
m?* r
pftrqdq etq 
:70
I 
Maximum Marks : 70
s6fit2
[P.T.O.
General Instructions
(i) All questions are compulsory.
(ii) 
Question 
numbers 1 to I are very short-answer questions and carry 7 mark each.
(iii) 
Question 
numbers 9 to 18 are short-answer questions and carry 2 marks each.
(iv) 
Question 
numbers 19 to 27 are also short-answer questions and carry 3 marks
each.
(v) 
Question 
numbers 28 to 30 are long-answer questions and carry 5 marlcs each.
(vi) tJse l-og Tables, if necessary. Use of calculators is not allowed.
1. da (sol) 
glh-+d 
Gel) 
trT 
\rs-qqtsqrtruTt 
| 
1
Give one example each of sol and gel.
2. ftwftnaqris+ftiq{+erqw.tqiw+1fifiil+ffi 6}at errqrqs'ErBr*rrfuqrqmrt ? I
Which reducing agent is employed to get copper from the leached low grade copper
ore ?
3. Frq dtrou IUPAC 
qFT 
ftrdi :
cH.-9H-CHz-CHO
"l
NH2
Write the IUPAC name of the compound
cH"-cH-cH2-cHo
,l
NHz
4. rq 
oTr{€tq{i 
tsq-qffiM.) 
{ t 
q+{ qr 
efir*'qlqvftd 
t t
q-qr{ifu{d eiq p-qr{dtFfrm
Which of the following isomers is more volatile :
o-nitrophenol or p-nitrophenol ?
s. 
56 
rq lqDm H 
qr+ y{'Qffi{e' q{r} 
t I Tr 
tfv+*tq 
wr t}* t t
Some liquids on mixing form 'azeotropes'. What are 'azeotropes' ?
6. Frq 
q\ffi 
s) {6fi 
Ei^q{rfto,,,dr 
*-mq { 
qqfsm 
dfsr+ :
c6HsNH2, C6H5NHCH3' C6H5CHTM'
Arrange the following in increasing order of basic strength :
6H5NH2, 
C6H5NHCH3' C6H5CH2NH2
56m2 
'2
7. €d'ff dq 
qr 
trm'u-wtg 
+T vndq 
qrrot 
eil{=rm ii qfudq 
t r
Which component 
of starch is a branched polymer 
of o-glucose and insoluble in water ?
8. ftE{ {*,d { * 
qir 
wr €rftrn'en+ 
*il t 
ske} 
r
[Co(NH)6]3* +{ 
[Co(en)r]3+
Which of the following is more stable complex and why ?
[Co(NH)6]3* and 
[Co(en)r]3+
g. 
ffi urftqq fuI r loqft +fi s1ffi rn{ gdwfrildrq{ETqqH 
sr*Trwne*dr 
t r 2
State Henry's law. What is the effect of temperature on the solubility of a gas in a
liquid ?
10. frq 
EI si 
qftqrkd 
fr1Fr+ :
(i) oTFTTS 
@seudo) 
sEq dfe6t srfi{pmur 
r
(ii) 
ffi ernrfrqrm 
ertloro 
ltro).
Define the following terms :
(i) 
Pseudo fust order reaction
(ii) 
Half life period 
of reacrion (ty2).
I t. 
yilT{ 
firqrqf *t frrr frft{rrf + silqrw 
frqq ffi 
.
(i) 
rrqrkfr *qr 
Glydraulic washing)
(ii) 
ilwtFfr ltrrr (Vapourphaserefining)
write the principle 
behind the following methods of refining :
(i) . 
Hydraulic 
washing
(ii) 
Vapour phase 
refining
tz. Frr 
ii 
+ rer 
qfi{PsqT 
{ qp 
+ilH semot drqqr 
M :
(i) 
Gou 
soc/z'
(ii) 
GcHz- 
cH= cH2 +1s1 
ffi*,
Draw the structure of m1j9r monohalo product 
in each of the following reactions :
(i) 
GoH 
soc/2,
(ii) 
GcHz 
- 
cH = cH, + 
1191 
Peroxide,
2
)
s6tu2
lP.T.O.
13. (i) f=rng'q+st{*ntftmmtiflEsffi\fi tsiY{orfuq^dd S*2 
erftlmqltntr 
z
nn
Br 
l,
(a) (b)
(ii) tpa ferftrqi 
ii 
s*t ek s*z 
it 
* 
qil{ 
S 
srFltffir 
tt ft t
(a) fuqru 6t rfreil (inversion)
(b) tftrqtfi"r (Racemisation)
(i) Which alkyl halide from the following pair is chiral and undergoes faster S*2
reaction ?
n,\^
Br
(a) (b)
(ii) Out of S*1 and S*2, which reaction occurs with
(a) Inversion of configuration
(b) Racemisation
14. 
qr 
{rsrqFr*,'{FM +} gn *t :
(i) CarPr+ HrO 
->
(i0 Cu + HTSO.G{O 
->
s{slElt
frq 
q\tm'{ffi[ 
o] e=r*,'qrq ffi 
'gw 
sr{qn 
qqf*uiT 
s1H :
(i) HF, HCr, Hgr 
eiltru 
- 
{6fr g$ enc*r ffiqq 
tffi 
or{qr
(ii) H2O, H2S, HrSe 
eilc 
H 
zT" 
-T6fr Ei' 
eTIrfi Hsfrr 
3r1ur
Complete the following chemical equations':
(i) CarPr+ HrO -+
(ii) Cu + HrSOo(conc.) +
OR
Arrange the following in the order of property indicated against each set :
(i) HF, HC/, HBr, HI 
- 
increasing bond dissociation enthalpy.
(ii) H2O, HzS, HrSe, HrTe 
- 
increasing acidic character.
15. ri+"r 
tcr(xH 
3)4clzl+ 
ET IUPAC {rq fud r 
q6t{T 
rsnftt 
qrTr*{r+il 
(isomerism; tcumr
tt
Write the IUPAC name of the complex 
[Cr(NH3)aCl21+. 
What type of isomerism does
it exhibit ?
16. ll.2 gsm-3 
q{q 
sil{ 
+ x t0{ cm flsilt- 
q+ 
riqr$ sr 
\rs-EEr f.c.c. 
sncroq-{rdT 
t I 
gs 
itr
sr 
.r{qruF 
tsqrrrT 
qfrskd 
o1H r
(Ne 
= 
6.022 x 1023 ft1-t)
An element with density 11.2 gcm-3 forms a f.c.c. lattice with edge length of 4x l6rs cm.
Calculate the atomic mass of the element.
(Given 
: No 
= 
6.A22x 1023 mol-l)
B- A+
B-
A+
A+
B- A+
B-
B_ B- A+
t7 . 
qei 
M 
rr$ qren 
eftyyi. 
fr,-{To 
q,r 
fr+q{ur sr sTr+ 
Te 
T+ 
qqii 
+.g+{ flmi :
B- A+ B-
A+B-A+O
B_ A+ B_ A+ B-
(0 
{s fls{ffi Enr +{ 
qr rrFr ontr6 
GEfiftrfu dq fffiqr 
qrfrr 
t ?
(ii) 
Eq 
qlq 
*'onq fr-w *'weq 
qt 
P*'q ,FFR usTtrr rEilr t ?
(iii) fl+q rsr+'eilqfffiqqr{ 
tsr 
qtq 
fusri.t r
Examine the given defective crystal
A+ B- A+ B- A+
A+B-A+O
A+
B_ A+ B- A+ B-
Answer the following questions 
:
(i) 
What type of stoichiometric defect is shown by the crystal ?
(ii) 
How is the density of the crystal affected by this defect ?
(iii) What type of ionic substances show such defect ?
18. 
qfrqftm 
s1F{+ fu 3Trurq qqqm 
= 
256 g +fl-r * 
q}Frq- 
*t a;er+ 
qr*r 
+} zs
qlmrqr+fu'gtr+-A*rif 
o.+s Ksts*Elqr{ I 
Gq= 
s.r2Kkg+n-rr.
Calculate the mass of compound (molar 
mass 
= 
256 gmol-t) to be dissolved
benzene to lower its freezing point by 0.48 K (& 
= 
S.tZ K kg mol-l).
56fit2 
5
sffi{if
inT5gof
tP.T.O.
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FAQs on Past Year Paper, Chemistry (Set - 2 ), Delhi, 2014, Class 12, Chemistry - Additional Study Material for Class 12

1. What is the importance of solving past year papers in chemistry for Class 12 students?
Ans. Solving past year papers in chemistry for Class 12 students is important as it helps them familiarize themselves with the exam pattern and the types of questions asked in the board exams. It allows students to practice and improve their time management skills, as well as helps them identify their weak areas and work on them. Additionally, solving past year papers gives students an idea of the level of difficulty of the questions, which can help them prepare effectively for the actual exam.
2. How can solving past year papers in chemistry help in improving exam performance?
Ans. Solving past year papers in chemistry can help improve exam performance in several ways. Firstly, it helps students in understanding the exam pattern and the marking scheme, which enables them to strategically plan their answers and allocate time to each question. Secondly, it helps in identifying common question patterns and important topics, allowing students to focus their preparation accordingly. Additionally, solving past year papers helps in improving time management skills and enhances confidence, as students become familiar with the format and difficulty level of the exam.
3. Are the questions in the past year papers of Class 12 chemistry similar to the actual board exam?
Ans. Yes, the questions in the past year papers of Class 12 chemistry are generally similar to the actual board exam. The board exams are conducted by following a prescribed syllabus, and the past year papers are created based on the same syllabus. While the specific questions may vary, the overall format, difficulty level, and topics covered in the past year papers are designed to be representative of the actual board exam. Therefore, solving past year papers can give students a good idea of what to expect in the exam and help them prepare accordingly.
4. How should I approach solving the past year papers of Class 12 chemistry?
Ans. To approach solving the past year papers of Class 12 chemistry, it is recommended to start by thoroughly understanding the syllabus and exam pattern. Once you have a clear understanding of the topics and question formats, begin solving the papers section-wise, timing yourself as you would in the actual exam. After completing each section, evaluate your answers and identify any areas that need improvement. Take note of the types of questions you find challenging, and revise those topics thoroughly. Repeat this process with multiple past year papers to enhance your understanding and performance.
5. Can solving past year papers alone guarantee success in the Class 12 chemistry exam?
Ans. While solving past year papers is an important part of exam preparation, it alone cannot guarantee success in the Class 12 chemistry exam. It is necessary to have a comprehensive understanding of the subject, which includes studying the textbook, practicing numerical problems, and revising important concepts. Solving past year papers helps in assessing your preparation level, identifying weak areas, and improving time management skills. However, it should be complemented with regular study, revision, and practice to ensure thorough preparation for the exam.
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