Rajasthan Board Class 12 Question Paper 2025 Chemistry

RAJASTHAN BOARD

QUESTION
PAPER
2025

ANNUAL EXAMINATION

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Sl.No. :

No. of Questions – 18 SS–41–Chem.
No. of Printed Pages – 15

CÀM _mÜ`{_H$ narjm, 2025
SENIOR SECONDARY EXAMINATION, 2025
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CHEMISTRY
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Candidate must write first his / her Roll No. on the question paper
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2) g^r àíZ A{Zdm`© h¢ &
All the questions are compulsory.
3) àË`oH$ àíZ H$m CÎma Xr JB© CÎma-nwpñVH$m _| hr {bI| &
Write the answer to each question in the given answer-book only.
4) {OZ àíZm| Ho$ AmÝV[aH$ IÊS> h¢, CZ g^r Ho$ CÎma EH$ gmW hr {bI| &
For questions having more than one part, the answers to those parts are to
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5) àíZ-nÌ Ho$ {hÝXr d A§J«oOr ê$nm§VaU _| {H$gr àH$ma H$s Ìw{Q> / A§Va / {damoYm^mg hmoZo na {hÝXr
^mfm Ho$ àíZ H$mo ghr _mZ| &
If there is any error / difference / contradiction in Hindi & English version of
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Write down the serial number of the question before attempting it.
`hm± go H$m{Q>E

7) àíZ H«$_m§H$ 14 go 18 ‘| AmÝV[aH$ {dH$ën h¢ &
Question No. 14 to 18 have internal choice.

SS-41-Chem. [ Turn Over

2
IÊS> - A
SECTION - A
~hþ{dH$ënmË‘H$> àíZ ( i go xviii) :-
Multiple Choice Questions (i to xviii) : -
1) {ZåZ{b{IV àíZm| Ho$ ghr {dH$ën H$m M¶Z H$s{OE Am¡a Xr JB© CÎmanwpñVH$m ‘| {b{IE &
Select the correct option of the following questions and write in the given answer book.
i) MgSO4 Ho$ nyU© {d¶moOZ Ho$ {bE dmÝQ> hm°’$ H$maH$ (i) H$m ‘mZ h¡ - [½]
(A) 1
(~) 2
(g) 3
(X) 4
The value of Van't Hoff factor (i) for complete dissociation of MgSO4 is -
(A) 1
(B) 2
(C) 3
(D) 4
ii) à{VamoYH$Vm ({d{eï> à{VamoY) H$s SI BH$mB© h¡ - [½]
(A) 
(~)  –1
(g) m
(X) m –1
SI unit of resistivity (specific resistance) is -
(A) 
(B)  –1
(C) m
(D) m –1
iii) J{bV gmo{S>¶‘ ³bmoamBS> Ho$ d¡ÚwVAnKQ>Z Ho$ CËnmX h¢ - [½]
(A) Na(s) Ed§ H2(g)
(~) NaOH Ed§ H2SO4
(g) H2(g) Ed§ Cl2(g)
(X) Na(s) Ed§ Cl2(g)
The products of the electrolysis of molten sodium chloride are -
(A) Na(s) and H2(g)
(B) NaOH and H2SO4
(C) H2(g) and Cl2(g)
(D) Na(s) and Cl2(g)
SS-41-Chem.

3
iv) {ÛVr¶ H$mo{Q> A{^{H«$¶m Ho$ {bE doJ pñWam§H$ H$s BH$mB© h¡ - [½]
(A) s –1
(~) mol L–1 s–1
(g) mol–1 L s–1
(X) mol–2 L2 s–1
The unit of rate constant for second order reaction is -
(A) s –1
(B) mol L–1 s–1
(C) mol–1 L s–1
(D) mol–2 L2 s–1

v) Eop³Q>Zm°`‹S> loUr H$m VËd h¡ - [½]
(A) Wmo[a¶‘
(~) gr[a¶‘
(g) H¡$S>{‘¶‘
(X) H«$mo{‘¶‘
Element of actinoid series is -
(A) Thorium
(B) Cerium
(C) Cadmium
(D) Chromium

vi) Obr¶ {db¶Z ‘| a§JhrZ YmVw Am¶Z h¡ - [½]
(A) Cu2+
(~) Zn2+
(g) Mn2+
(X) V2+
Colourless metal ion in aqueous solution is -
(A) Cu2+
(B) Zn2+
(C) Mn2+
(D) V2+
SS-41-Chem. [ Turn Over

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vii) hmo‘mobopßQ>H$ g§Hw$b h¡ - [½]
(A) [Co(NH3)5Cl]2+
(~) [Co (NH3)4 Cl2]+
(g) [Co Cl2 (en)2]+
(X) [Co (NH3)6]3+
Homoleptic complex is -
(A) [Co(NH3)5Cl]2+
(B) [Co (NH3)4 Cl2]+
(C) [Co Cl2 (en)2]+
(D) [Co (NH3)6]3+

viii) [Cr(NH3)3(H2O)3]Cl3 g§Hw$b ‘| Cr H$s Cnghg§¶moOZ g§»¶m h¡ - [½]
(A) 3
(~) 9
(g) 5
(X) 6
Coordination number of Cr in [Cr(NH3)3(H2O)3]Cl3 complex is -
(A) 3
(B) 9
(C) 5
(D) 6

ix) Wm¶mo{Zb ³bmoamBS> h¡ - [½]
(A) SOCl2
(~) SO2Cl2
(g) COCl2
(X) SOCl3
Thionyl chloride is -
(A) SOCl2
(B) SO2Cl2
(C) COCl2
(D) SOCl3
SS-41-Chem.

5
x) ~opÝO{bH$ h¡bmBS> ‘| h¡bmoOZ na‘mUw go OwS>o H$m~©Z na‘mUw H$s g§H$[aV AdñWm h¡ - [½]
(A) sp
(~) sp 2
(g) sp 3
(X) sp 3 d
The hybridised state of carbon atom attached to halogen atom in benzylic
halide is -
(A) sp
(B) sp 2
(C) sp 3
(D) sp 3 d

xi) AYmo{b{IV ‘| go Ag‘{_V B©Wa h¡ - [½]
(A) CH3–O–CH3
(~) C2H5–O–C 2H5
(g) C6H5–O–C 6H5
(X) C6H5–O–CH3
Asymmetrical ether among the following is -
(A) CH3–O–CH3
(B) C2H5–O–C 2H5
(C) C6H5–O–C 6H5
(D) C6H5–O–CH3

xii) CH3–CH2–OH 
gm§Ð H 2SO 4
413k
 [A]
Cn¶w©³V A{^{H«$¶m ‘| ‘w»¶ CËnmX [A] h¡ - [½]
(A) CH3–O–CH3
(~) C2H5–O–C 2H5
(g) CH3–CH = CH2
(X) CH2 = CH2
CH3–CH2–OH 
Conc. H 2SO 4
413k
 [A]
Main product [A] in the above reaction is -
(A) CH3–O–CH3
(B) C2H5–O–C 2H5
(C) CH3–CH = CH2
(D) CH2 = CH2
SS-41-Chem. [ Turn Over

6
xiii) {ZåZ{b{IV ‘| go H$m¡Zgm EopëS>hmBS> H¡${ZμOmamo A{^{H«$¶m XoVm h¡ - [½]
(A) CH3–CHO
(~) CH3–CH2–CHO
(g) (CH3)2–CH–CHO
(X) C6H5–CHO
Which of the following aldehydes undergo Cannizzaro reaction -
(A) CH3–CHO
(B) CH3–CH2–CHO
(C) (CH3)2–CH–CHO
(D) C6H5–CHO

xiv) AYmo{b{IV ‘| go à~bV‘ Aåb h¡ - [½]
(A) FCH2COOH
(~) ClCH2COOH
(g) BrCH2COOH
(X) CH3COOH
Strongest acid among the following is -
(A) FCH2COOH
(B) ClCH2COOH
(C) BrCH2COOH
(D) CH3COOH

xv) {hÝg~J© A{^H$‘©H$ h¡ - [½]
(A) C6H5SO2Cl
(~) C6H5SO2Cl2
(g) C6H5SOCl2
(X) C6H5SO3Cl
Hinsberg's reagent is -
(A) C6H5SO2Cl
(B) C6H5SO2Cl2
(C) C6H5SOCl2
(D) C6H5SO3Cl

SS-41-Chem.

7
xvi) CH3–NH–CH2–CH3 H$m IUPAC Zm‘ h¡ - [½]
(A) àmonoZ-1-Eo‘rZ
(~) àmonoZ-2-Eo‘rZ
(g) N-‘o{WbEWoZ‘o rZ
(X) N-E{Wb‘oWZo ‘o rZ
IUPAC name of CH3–NH–CH2–CH3 is -
(A) Propan–1–amine
(B) Propan–2–amine
(C) N–Methylethanamine
(D) N-Ethylmethanamine

xvii) S>mBg¡H¡$amBS> h¡ - [½]
(A) ½byH$mog
(~) ’«$³Q>moμO
(g) gyH«$mog
(X) ñQ>mM©
Disaccharide is -
(A) Glucose
(B) Fructose
(C) Sucrose
(D) Starch

xviii) AZmdí¶H$ Eo‘rZmo Aåb h¡ - [½]
(A) d¡brZ
(~) ë¶ygrZ
(g) bmBgrZ
(X) ½bmBgrZ
Non-essential amino acid is -
(A) Valine
(B) Leucine
(C) Lysine
(D) Glycine
SS-41-Chem. [ Turn Over

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2) [aº$ ñWmZm| H$s ny{V© H$s{OE :- (i go x)
Fill in the blanks :- (i to x)
i) {h‘m§H$ AdZ‘Z pñWam§H$ (Kf) H$s BH$mB© ........... h¡ & [½]
The unit of freezing point depression constant (Kf) is ______.

ii) gm§ÐVm KQ>Zo Ho$ gmW ‘moba MmbH$Vm ............ h¡ & [½]
Molar conductivity _______ with decrease in concentration.

iii) CƒXm~ na, J¡gr¶ A‘mo{Z¶m H$m Vá ßb¡{Q>Z‘ gVh na {d¶moOZ ............. H$mo{Q> H$s A{^{H«$¶m H$m
CXmhaU h¡ & [½]
At high pressure, the decomposition of gaseous ammonia on a hot platinum
surface is an example of ______ order reaction.
iv) dgm Ho$ hmBS´>moOZZ ‘| .............. CËàoaH$ Ho$ ê$n ‘| à¶w³V hmoVm h¡ & [½]
________ is used as catalyst in the hydrogenation of fats.

v) Fe(CO)5 ‘| Am¶aZ H$s Am°³grH$aU AdñWm .............. h¡ & [½]
Oxidation state of iron in Fe(CO)5 is _________.

vi) ‘oWoZm°b H$m ³dWZm§H$ ............ K h¡ & [½]
The boiling point of methanol is ________K.

vii) O~ μ’$sZm°b H$s A{^{H«$¶m gm§Ð ZmB{Q´>H$ Aåb Ho$ gmW H$amB© OmVr h¡ Vmo .............. CËnmX ~ZVm h¡ &
[½]
When phenol is reacted with concentrated nitric acid, the product formed is
________.

viii) H2SO4 Ed§ HgSO4 H$s CnpñW{V ‘| EWmBZ Ho$ Ob ¶moOZ go .............. àmá hmoVm h¡ & [½]
_________ is obtained on addition of water to ethyne in presence of H2SO4
and HgSO4.

ix) {dQ>m{‘Z B Ed§ ............ Ob ‘| {dbo¶ {dQ>m{‘Z h¢ & [½]
Water soluble Vitamins are Vitamin B and ________.

x) gyH«$mog Ob AnKQ>Z na ½byH$mog VWm ............ XoVm h¡ & [½]
Sucrose on hydrolysis gives glucose and ___________.

SS-41-Chem.

9
3) A{V bKwÎmamË‘H$ àíZ :- (i go x)
({ZåZ àíZm| Ho$ CÎma EH$ eãX ¶m EH$ n§{³V ‘| Xr{OE)
Very short answer type questions :- (i to x)
(Answer the following questions in one word or one line)
i) ‘mobbVm H$s n[a^mfm {b{IE & [1]
Write the definition of molality.

ii) amCëQ> Ho$ {Z¶‘ H$m J{UVr¶ ê$n {b{IE & [1]
Write the mathematical form of Raoult's law.

iii) O{Q>b A{^{H«$¶mAm| H$mo n[a^m{fV H$s{OE & [1]
Define the complex reactions.

iv) K3[Cr(C2O4)3] g§Hw$b H$m IUPAC Zm‘ {b{IE & [1]
Write IUPAC name of the K3[Cr(C2O4)3] complex.

v) J«rݶma A{^H$‘©H$ H$m H$moB© EH$ CXmhaU {b{IE & [1]
Write any one example of Grignards reagent.

vi) {’${Q>J A{^{H«$¶m H$m amgm¶{ZH$ g‘rH$aU {b{IE & [1]
Write chemical equation of Fittig reaction.

vii) g¡{b{g{bH$ Aåb Ho$ Eogr{Q>bZ go àmá ¶m¡{JH$ H$m Zm‘ {b{IE & [1]
Write the name of compound obtained from the acetylation of salicylic acid.

viii) {ZåZ{b{IV ¶m¡{JH$m| H$mo Obr¶ {db¶Z ‘| CZH$s jmaH$s¶ à~bVm Ho$ ~T>Vo H«$‘ ‘| ì¶dpñWV
H$s{OE & [1]
NH3, C2H5NH2, (C2H5)2NH, (C2H5)3N
Arrange the following compounds in increasing order of their basic strength
in aqueous solution
NH3, C2H5NH2, (C2H5)2NH, (C2H5)3N

ix) aoeoXma àmoQ>rZ Ho$ Xmo CXmhaU {b{IE & [1]
Write two examples of fibrous proteins.

x) DNA H$s {ÛHw§$S>bZr g§aMZm H$m {MÌ ~ZmBE & [1]
Draw a diagram of double strand helix structure for DNA.

SS-41-Chem. [ Turn Over

10
IÊS> - ~
SECTION - B
bKw Î mamË‘H$ àíZ :- (CÎma gr‘m bJ^J 50 eãX)
Short answer type questions :- (Answer limit about 50 words)

4) 4.0 g NaOH H$mo Ob ‘| KmobH$a 500mL {db¶Z ~Zm¶m J¶m & {db¶Z H$s ‘mobaVm H$s JUZm
H$s{OE & [1½]
500mL solution was prepared by dissolving 4.0 g of NaOH in water. Calculate the
molarity of the solution.

5) à{Vbmo‘ namgaU H$mo Xem©Z| dmbm {MÌ ~ZmBE & [1½]
Draw a diagram showing reverse osmosis.

6) {ZH¡$b-H¡$S>{‘¶‘ gob H$m Zm‘m§{H$V {MÌ ~ZmBE & [1½]
Draw a labelled diagram of nickel-cadmium cell.

7) Fe2+ (aq.) Am¶Z Ho$ {bE "àMH«$U-‘mÌ' Mw§~H$s¶ AmKyU© H$s JUZm H$s{OE & [1½]
Calculate the spin-only magnetic moment for Fe2+ (aq.) ion.

8) b¡ÝWoZm°¶‹S> AmHw§$MZ H$mo g‘PmBE & [1½]
Explain lanthanoid contraction.

9) {ZåZ{b{IV nXm| H$mo n[a^m{fV H$s{OE - [¾ + ¾ = 1½]
A) Y«wdU KyU©H$Vm
~) H$mBabVm
Define the following terms -
a) Optical activity
b) Chirality

SS-41-Chem.

11
10) EH$mpÊdH$ Zm{^H$amJr à{VñWmnZ A{^{H«$¶m H$s {H«$¶m{d{Y H$mo g‘PmBE & [1½]

Explain the mechanism of unimolecular nucleophilic substitution reaction.

11) {ZåZ{b{IV ¶m¡{JH$m| Ho$ g§aMZmË‘H$ gyÌ {b{IE - [¾ + ¾ = 1½]

A) AmBgmoàmo{nb EoëH$mohm°b
~) {×Vr¶H$-ã¶y{Q>b EoëH$mohm°b
Write structural formula of the following compounds -
a) Isopropyl alcohol
b) Sec-Butyl alcohol

12) μ’$sZm°b H$s AZwZmXr g§aMZmE§ ~ZmBE & [1½]

Draw the resonating structure of phenol.

13) {ZåZ{b{IV amgm¶{ZH$ g‘rH$aUm| H$mo nyU© H$s{OE Ed§ ‘w»¶ CËnmX {b{IE - [¾ + ¾ = 1½]

A) 
CO, HCl
[ZO©b AlCl3
 .................

CH3
~) C = O + H2N – NH – 
 ...........
CH3

Complete the following chemical equations and write the main product -

a) 
CO, HCl
Anhydrous AlCl3
.................

CH3
b) C = O + H2N – NH – 
 ...........
CH3

SS-41-Chem. [ Turn Over

12
IÊS> - g
SECTION - C
XrK© CÎmamË‘H$ àíZ :- (CÎma gr‘m bJ^J 100 eãX)
Long answer type questions :- (Answer limit about 100 words)

14) A) ’¡$amS>o H$m d¡ÚwVAnKQ>Z H$m àW‘ {Z¶‘ {b{IE &
~) 298K na 0.01 M KCl {db¶Z H$s MmbH$Vm 0.00141 S cm–1 h¡ & 0.01 M KCl {db¶Z
H$s ‘moba MmbH$Vm H$m n[aH$bZ H$s{OE &
[1+2=3]
a) Write Faraday's first law of electrolysis.
b) The conductivity of 0.01 M KCl solution at 298K is 0.00141 S cm–1. Calculate
the molar conductivity of 0.01 M KCl solution.
AWdm/OR
A) ’¡$amS>o H$m d¡ÚwVAnKQ>Z H$m {ÛVr¶ {Z¶‘ {b{IE &
~) 298 K na 0.05 M NaOH {db¶Z H$s MmbH$Vm 0.01150 S cm–1 h¡ & 0.05 M NaOH
{db¶Z H$s ‘moba MmbH$Vm H$m n[aH$bZ H$s{OE &

a) Write Faraday's second law of electrolysis.
b) The conductivity of 0.05 M NaOH solution at 298 K is 0.01150 S cm–1.
Calculate the molar conductivity of 0.05 M NaOH solution.

15) g§¶moOH$Vm Am~§Y {gÕmÝV Ho$ AmYma na [FeF6]3– g§Hw$b Am¶Z H$s Á¶m{‘{V Am¡a Mw~§ H$s¶ àH¥${V H$mo
g‘PmBE & [1+1+1=3]
Explain the geometry and magnetic nature of the complex ion [FeF6]3– on the
basis of valence bond theory.
AWdm/OR
g§¶moOH$Vm Am~§Y {gÕmÝV Ho$ AmYma na [Ni(CN)4]2– g§Hw$b Am¶Z H$s Á¶m{‘{V Am¡a Mw§~H$s¶ àH¥${V H$mo
g‘PmBE &
Explain the geometry and the magnetic nature of the complex ion [Ni(CN)4]2– on
the basis of valence bond theory.

SS-41-Chem.

13
16) {ZåZ{b{IV H$mo EH$ nX ‘| n[ad{V©V H$s{OE -
(Ho$db amgm¶{ZH$ g‘rH$aU {b{IE)
A) ~oÝOrZS>mBEo‹Omo{Z¶‘ ³bmoamBS go μ’$sZm°b
~) Eo{ZbrZ go 2, 4, 6 - Q´>mB~«mo‘moEo{ZbrZ
g) EWoZo‘mBS> go ‘oWoZo‘rZ
[1+1+1=3]
Convert the following in single step -
(Write chemical equation only)
a) Benzenediazoniumchloride to phenol
b) Aniline to 2, 4, 6 - tribromoaniline
c) Ethanamide to Methanamine
AWdm/OR
{ZåZ{b{IV H$mo EH$ nX ‘| n[ad{V©V H$s{OE -
(Ho$db amgm¶{ZH$ g‘rH$aU {b{IE)
A) ~oÝOrZS>mBEo‹Omo{Z¶‘ ³bmoamBS go gm¶Zmo~oÝOrZ
~) Eo{ZbrZ go ~oÝOrZS>mBEoμOmo{Z¶‘ ³bmoamBS>
g) ZmBQ´>mo‘oWoZ go ‘oWoZo‘rZ

Convert the following in single step -
(Write chemical equation only)
a) Benzenediazoniumchloride to cyanobenzene
b) Aniline to benzenediazonium chloride
c) Nitromethane to methanamine

SS-41-Chem. [ Turn Over

14
IÊS> - X

SECTION - D

{Z~§ Y mË‘H$ àíZ :- (CÎma gr‘m bJ^J 250 eãX)
Essay type questions :- (Answer limit about 250 words)

17) A) A{^{H«$¶m H$s AmpÊdH$Vm H$mo n[a^m{fV H$s{OE &

~) eyݶ H$mo{Q> A{^{H«$¶m Ho$ {bE AYm©¶w H$m 춧OH$ ì¶wËnÝZ H$s{OE &
g) Xem©BE {H$ EH$ àW‘ H$mo{Q> A{^{H«$¶m ‘| 99.9% A{^{H«$¶m nyU© hmoZo ‘| bJm g‘¶ AYm©¶w H$m 10 JwZm
hmoVm h¡ & ({X¶m h¡ log1010 = 1)
[1+1+2=4]

a) Define the molecularity of reaction.

b) Derive the expression of half-life for zero order reaction.

c) Show that in a first order reaction time required for completion of 99.9% is
10 times of half - life of the reaction (Given log1010 = 1)

AWdm / OR
A) g§KQ²>Q> Amd¥{V H$mo n[a^m{fV H$s{OE &
~) àW‘ H$mo{Q> A{^{H«$¶m Ho$ {bE AYm©¶w H$m 춧OH$ ì¶wËnÝZ H$s{OE &
g) Xem©BE {H$ EH$ àW‘ H$mo{Q> A{^{H«$¶m ‘| 75% A{^{H«$¶m nyU© hmoZo ‘| bJm g‘¶ AYm©¶w H$m XþJwZm hmoVm
h¡ & ({X¶m h¡ log102 = 0.3010, log1010 = 1)

a) Define collision frequency.

b) Derive the expression of half-life for first order reaction.

c) Show that in a first order reaction time required for completion of 75% is
twice of half - life of the reaction. (Given log102 = 0.3010, log1010 = 1)

SS-41-Chem.

15
18) A) ~¡Ho$bmBQ> Ho$ {daMZ ‘| à¶w³V EopëS>hmBS> H$m Zm‘ {b{IE &
~) ½byQ>o[aH$ Aåb H$m IUPAC Zm‘ {b{IE &
g) amoμOoZ‘w§S> AnM¶Z A{^{H«$¶m H$mo CXmhaU H$s ghm¶Vm go g‘PmBE &
[1+1+2=4]

a) Write the name of aldehyde used in the preparation of bakelite.

b) Write IUPAC name of glutaric acid.

c) Explain Rosenmund reduction reaction with the help of an example.

AWdm / OR
A) ImÚ CÚmoJm| ‘| {gaHo$ Ho$ ê$n ‘| à¶w³V H$m~m}p³g{bH$ Aåb H$m Zm‘ {b{IE &
~) Eo{S>{nH$ Aåb H$m IUPAC Zm‘ {b{IE &
g) hob’$mobmS>© OoqbñH$s A{^{H«$¶m H$mo CXmhaU H$s ghm¶Vm go g‘PmBE &
a) Write the name of carboxylic acid used as vinegar in food industry.

b) Write IUPAC name of adipic acid.

c) Explain Hell-Volhard Zelinsky reaction wtih the help of an example.

♦♦♦

SS-41-Chem.

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