Rajasthan Board Class 12 Question Paper 2023 Chemistry

Rajasthan Board

QUESTION
PAPER

Zm_m§H$ Roll No.

Tear Here
Sl.No. :

No. of Questions – 20 SS–41–Chem.
No. of Printed Pages – 15

CÀM _mÜ`{_H$ narjm, 2023
SENIOR SECONDARY EXAMINATION, 2023
agm¶Z {dkmZ

TEAR HERE TO OPEN THE QUESTION PAPER
CHEMISTRY
g_` : 3 KÊQ>o 15 {‘ZQ>
nyUmªH$ : 56

àíZ nÌ H$mo ImobZo Ho$ {bE `hm± \$m‹S>|
narjm{W©`m| Ho$ {bE gm_mÝ` {ZX}e …
GENERAL INSTRUCTIONS TO THE EXAMINEES :
1) narjmWu gd©àW_ AnZo àíZ-nÌ na Zm_m§H$ A{Zdm`©V… {bI| &
Candidate must write first his / her Roll No. on the question paper
compulsorily.
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
be written together in continuity.
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$mo ghr _mZ| &
If there is any error / difference / contradiction in Hindi & English version
of the question paper, the question of Hindi version should be treated
valid.
6) àíZ H$m CÎma {bIZo go nyd© àíZ H$m H«$‘m§H$ Adí¶ {bI|&
`hm± go H$m{Q>E

Write down the serial number of the question before attempting it.
7) àíZ H«$_m§H$ 19 go 20 ‘| AmÝV[aH$ {dH$ën h¢ &
Question No. 19 to 20 have internal choice.

SS-41-Chem. 3029 [ Turn Over

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IÊS> - A

SECTION - A

dñVw{Zð> àíZ :

Multiple Choice Questions :

1) {ZåZm§{H$V àíZm| ‘| {X¶o J¶o ghr {dH$ën H$m M¶Z H$a CÎma nwpñVH$m ‘| {b{IE : [9 × 1 = 9]

Write the answer of following multiple choice questions in the given answer book :

i) S>oݶb gob ‘| Zn2+ d Cu2+ Am¶Zm| H$s gmÝÐVm EH$ BH$mB© (1 ‘mob S>ogr‘rQ>a –3) hmo Vmo {dÚwVr¶
{d^d H$m ‘mZ hmoJm - [1]

(A) 0.00 V

(~) 1.10 V

(g) 1.35 V

(X) 2.00 V

When concentration of Zn2+ and Cu2+ ions is unity (1 mol dm–3), then electrical
potential of Daniell cell will be -

(A) 0.00 V

(B) 1.10 V

(C) 1.35 V

(D) 2.00 V

SS-41-Chem.

3
2.303 [R]
ii) 춧OH$ k  log  H$mo{Q> H$s A{^{H«$¶m H$m g‘mH${bV doJ g‘rH$aU h¡ - [1]
t [R]

(A) eyݶ H$mo{Q>
(~) àW‘ H$mo{Q>
(g) {ÛVr¶ H$mo{Q>
(X) V¥Vr¶ H$mo{Q>

2.303 [R]
Expression k  log  is integrated rate equation of order of reaction -
t [R]

(A) Zero order
(B) First order
(C) Second order
(D) Third order

iii) g‘¶ Ho$ {H$gr jU na doJ 춳V H$aZo Ho$ {bE ...................... kmV {H$¶m OmVm h¡ - [1]
(A) àma§{^H$ doJ
(~) VmËj{UH$ doJ
(g) Am¡gV doJ
(X) ‘mZH$ doJ
To express the rate at a particular moment of time we determine the
___________.
(A) Initial rate
(B) Instantaneous rate
(C) Average rate
(D) Standard rate

SS-41-Chem. [ Turn Over

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iv) H$mobmB‹S>r EÝQ>r‘Zr H$m Cn¶moJ {H$g amoJ Ho$ BbmO ‘| hmoVm h¡ - [1]

(A) H$mbmOma

(~) noQ> H$s J‹S>~‹S>r

(g) ËdMm g§~§Yr amoJ

(X) b¢{JH$ amoJ

Colloidal antimony is used in curing of -

(A) Kalaazar

(B) Stomach disorders

(C) Skin disease

(D) Sexual disease

v) H¡$bm‘mBZ A¶ñH$ h¡ - [1]

(A) Al H$m

(~) Fe H$m

(g) Cu H$m

(X) Zn H$m

Calamine is ore of -

(A) Al

(B) Fe

(C) Cu

(D) Zn

SS-41-Chem.

5
vi) {ÛX§Vwa {bJÊS> h¡ - [1]

(A) C 2O 42–
–
(~) SCN
(g) NH3
–
(X) Cl
Didentate Ligand is -

(A) C 2O 42–
–
(B) SCN

(C) NH3
–
(D) Cl

vii) CF2Cl2 H$m {’«$Am°Z nÕ{V ‘| Zm‘ h¡ - [1]

(A) {’«$Am°Z 112

(~) {’«$Am°Z 12

(g) {’«$Am°Z 122

(X) {’«$Am°Z 11

The name of CF2Cl2 in freon method is -

(A) Freon 112

(B) Freon 12

(C) Freon 122

(D) Freon 11

SS-41-Chem. [ Turn Over

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viii) ³¶y‘rZ go {’$Zm°b àmá H$aZo H$s A{^{H«$¶m ‘o§ CnmoËnmX h¡& [1]

(A) Q´>mB~«mo‘mo{’$Zm°b

(~) ~oÝOmo{³dZmoZ

(g) {n{H«$H$ Aåb

(X) EogrQ>moZ

In reaction of manufacturation of phenol from cumene the by-product is

(A) Tribromophenol

(B) Benzoquenone

(C) Picric acid

(D) Acetone

ix) ZmBQ´>moOZr jmaH$ DNA ‘| Zht nm¶m OmVm - [1]

(A) EoS>oZrZ

(~) gmBQ>m{o gZ

(g) ½dmZrZ

(X) ¶yao{gb

The nitrogeneous base not present in DNA -

(A) Adenine

(B) Cytosine

(C) Guanine

(D) Uracil

SS-41-Chem.

7
2) [aº$ ñWmZm| H$s ny{V© H$s{OE -

Fill in the blanks - [4 × 1 = 4]

i) O~ {‘bm¶m J¶m nXmW© A{^{H«$¶m H$s Xa H$mo H$‘ H$aVm h¡, Vmo CËàoaH$ Ho$ ñWmZ na Cgo ...............
H$hVo h¡& [1]

When the added substance reduces the rate of reaction, then it called
__________ in place of catalyst.

ii) AUwH$ ñnrerO H$m {H$gr R>mog ¶m Ðd H$s ñWyb H$s Anojm n¥ð> na g§{MV hmoZm .................
H$hbmVm h¡& [1]

The accumulation of molecular species at the surface rather than in the bulk
of a solid or liquid is termed __________.

iii) {d{b¶‘gZ g§íbofU ‘| ........................ H$s gmo{S>¶‘ EoëH$mo³gmBS> Ho$ gmW A{^{H«$¶m go S>mB
EopëH$b B©Wa ~ZVm h¡& [1]

In Williamson synthesis the ____________ reacts with sodium alkoxide and
give dialkyl ether.

iv) ........................ H$m Obr¶ {db¶Z ’o$qbJ {db¶Z A H$hbmVm h¡& [1]

The aqueous solution of ___________ is called fehling solution A.

SS-41-Chem. [ Turn Over

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3) A{V bKwÎmamË‘H$ àíZ :

Very short answer type questions : [8 × 1 = 8]

i) àmH¥${VH$ Ed§ H¥${Ì‘ Zm{^H$s¶ (aoS>r¶moEop³Q>d) j¶ H$s H$mo{Q> {b{IE& [1]

Write order of reaction of natural and artificial nuclear (radioactive) decay.

ii) ¶w[a¶m H$m A‘mo{Z¶m Ed§ H$m~©Z S>mBAm°³gmBS> ‘| AnKQ>Z ‘| à¶w³V EÝOmB‘ H$m Zm‘ {b{IE& [1]

Write the name of enzyme used in decomposition of urea into ammonia and
carbondioxide.

iii) gwH«$mog H$mo hmdW© g§aMZm Ûmam {Zê${nV H$s{OE& [1]

Represent sucrose by Haworth structure.

iv) d¡ÚwV AnmohZ H$m Zm‘m§{H$V {MÌ ~ZmB¶o& [1]

Draw labeled diagram of electro-dialysis.

v) ’o$Z ßbdZ {d{Y H$m Zm‘m§{H$V {MÌ ~ZmB¶o& [1]

Draw labeled diagram of frouth floatation process.

SS-41-Chem.

9
vi) {’$Zm°b go go{b{g{bH$ Aåb ~ZmZo H$s amgm¶{ZH$ g‘rH$aU {b{IE& [1]

Write chemical equation to prepare salicylic acid from phenol.

vii) AmBgmo ã¶w{Q>b EoëH$mohm°b H$m IUPAC Zm‘ {b{IE& [1]

Write IUPAC name of isobutyl alcohol.

viii) ~oÝOrZ S>mBEoOmo{Z¶‘ ³bmoamB‹S> H$m amgm¶{ZH$ gyÌ {b{IE& [1]

Write chemical formula of benzene diazonium chloride.

IÊS> - ~

SECTION - B

bKw Î mamË‘H$ àíZ :

Short answer type questions : [12×1½=18]

4) ’$bH$ - Ho$pÝÐV KZr¶ EH$H$ H$mo{ï>H$m ‘| Hw$b H$Um| H$s g§»¶m n[aH${bV H$s{OE& [1½]

Calculate number of particles in face centred cubic unit cell.

SS-41-Chem. [ Turn Over

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5) P - àH$ma Ho$ AY©MmbH$ H$mo EH$ CXmhaU XoH$a g‘PmB¶o& [1½]

Explain P - type semiconductor by one example.

6) ³bmoamo ~oÝOrZ go S>mB’o${Zb ~ZmZo H$s amgm¶{ZH$ A{^{H«$¶m H$s amgm¶{ZH$ g‘rH$aU {b{IE& [1½]

Write chemical equation to prepare diphenyl from chlorobenzene.

7) E{WbrZ ½bmBH$m°b H$m 35% (V/V) {db¶Z dmhZm| Ho$ B§OZ H$mo R>ÊS>m H$aZo Ho$ H$m‘ AmVm h¡& Bg‘| Ob H$m
Am¶VZ {‘brbrQ>a ‘| kmV H$s{OE& [1½]

A 35% (V/V) solution of ethylene glycol is used in vehicle for cooling the engine.
Determine the volume of water in millilitre.

8) namgaU H$s n[a^mfm {b{IE& g‘wÐr Ob Ho$ {dbdUrH$aU ‘| à¶w³V {d{Y H$m Zm‘ {b{IE& [1½]

Write definition of osmosis. Write name of method used in desalination of sea
water.

9) [Pt(H2O)2Br2] Ho$ Á¶m{‘Vr¶ g‘md¶{d¶m| H$s Á¶m{‘{V ~ZmH$a {dݶmg {b{IE& [1½]

Draw the geometries of geometrical isomers of [Pt(H2O)2Br2] and write their
configurations.

SS-41-Chem.

11
10) {ZåZm§{H$V Ho$ IUPAC Zm‘ {b{IE& [3×½=1½]

i) [Cu(H2O)4]2+

ii) [Co(NH3)6]Br3

iii) [Fe(CN)6]3–

Write IUPAC names of following.

i) [Cu(H2O)4]2+

ii) [Co(NH3)6]Br3

iii) [Fe(CN)6]3–

11) hm°’$‘mZ ~«mo‘m‘mBS> {ZåZrH$aU A{^{H«$¶m na {Q>ßnUr {b{IE& [1½]

Write short note on Hoffmann bromamide degradation reaction.

12) H$maU Xr{OE {H$ Q´>mB‘o{Wb E‘rZ, ‘o{Wb E‘rZ go H$‘ jmar¶ h¡& [1½]

Give reason that trimethyl amine is less basic than methyl amine.

13) H¥${Ì‘ ‘YwaH$ H$mo H$moB© Xmo CXmhaU XoH$a g‘Pm¶o& [1½]

Explain artificial sweetening agents by any two examples.

SS-41-Chem. [ Turn Over

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14) {ZåZm§{H$V Ho$ H$moB© EH$ CXmhaU Xr{OE - [3×½=1½]

i) à{VO¡{dH$ Am¡fY
ii) ñdmnH$ nr‹S>mhmar
iii) à{VAåb Am¡fY
Give any one example of following -

i) Antibiotics

ii) Narcotic analgesics

iii) Antacids

15) ñdmQ>© A{^{H«$¶m H$mo EH$ CXmhaU XoH$a g‘Pm¶o& [1½]

Explain Swarts reaction by any one example.

IÊS> - g
SECTION - C
XrK© CÎmamË‘H$ àíZ :
Long answer type questions : [3×3=9]

16) i) BªYZ gob H$s g§aMZm H$m dU©Z H$s{OE&
ii) BªYZ gob H$s g§aMZm H$m Zm‘m§{H$V {MÌ ~ZmB¶o&
[2+1=3]

i) Describe structure of fuel cell.

ii) Draw labeled diagram of fuel cell.

SS-41-Chem.

13

17) i) Cu (2aq ) Am¶Z Ho$ {bE "àMH«$U ‘mÌ' Mwå~H$s¶ AmKwU© H$s JUZm H$s{OE&

ii) H$maU Xr{OE {H$ Zn, Cd, Hg d Cn g§H«$‘U VËd Zht h¡&

iii) {‘l YmVw nrVb Ho$ Ad¶dm| Ho$ Zm‘ {b{IE&

[1+1+1=3]

i) Calculate the 'Spin only' magnetic moment of Cu (2aq ) ion.

ii) Give reason that Zn, Cd, Hg, and Cn are not transition elements.

iii) Write names of components of brass.

18) AÝVa {b{IE -

i) Aën KZËd nm°{bWrZ d CÀM KZËd nm°{bWrZ&

ii) g‘~hþbH$ d gh~hþbH$&

iii) àmH¥${VH$ ~hþbH$ d g§íbo{fV ~hþbH$&

[1+1+1=3]

Write differences -

i) Low density polythene and High density polythene.

ii) Homopolymers and copolymers.

iii) Natural polymers and synthetic polymers.

SS-41-Chem. [ Turn Over

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IÊS> - X

SECTION - D
{Z~§ Y mË‘H$ àíZ :

Essay type questions : [2×4=8]

19) i) nmBamo’$m°ñ’$mo[aH$ Aåb d gmB³bmo Q´>mB©‘oQ>m’$m°ñ’$mo[aH$ Aåb Ho$ g§aMZm gyÌ {b{IE&

ii) {df‘b§~mj J§YH$ d EH$ZVmj J§YH$ ‘o§ H$moB© Xmo A§Va {b{IE&

[2+2=4]

AWdm

i) naAm°³gmoS>mBgëâ¶w[aH$Aåb d nmBamogëâ¶w[aH$ Aåb Ho$ g§aMZm gyÌ {b{IE&

ii) ídoV ’$m°ñ’$moag d bmb ’$m°ñ’$moag ‘| H$moB© Xmo A§Va {b{IE&

i) Write structural formula of pyrophosphoric acid and cyclo trimetaphosphoric
acid.

ii) Write any two differences between rhombic sulphur and monoclinic sulphur.

OR

i) Write structural formula of peroxodisulphuric acid and pyrosulphuric acid.

ii) Write any two differences between white phosphorus and red phosphorus.

SS-41-Chem.

15

2 CH3CHO 
 x   y Cnamo³V A{^{H«$¶m AZwH«$‘ ‘|o x d y Ho$ amgm¶{ZH$
VZw NaOH
20) i)  H 2O

gyÌ {bIH$a IUPAC Zm‘ {b{IE&

ii) JmQ>a‘mZ H$m°I A{^{H«$¶m na {Q>ßnUr {b{IE&

[2+2=4]

AWdm

i) CH3MgBr + CO2 
eîwH$ B¶©a H O
 x    y Cnamo³V A{^{H«$¶m AZwH«$‘ ‘| x d y Ho$ amgm¶{ZH$
3

gyÌ {bIH$a Zm‘ {b{IE&

ii) amoOoZ‘wÊS> AnM¶Z na {Q>ßnUr {b{IE&


2 CH3CHO 
 x   y Write chemical formula and IUPAC name
dil.NaOH
i)  H 2O

of x and y in above chemical sequence.

ii) Write short note on Gattermann - Koch reaction.

OR


 H3 O
i) CH3MgBr + CO2  
dry ether
 x   y Write chemical formula and name
of x and y in above chemical sequence.

ii) Write short note on Rosenmund reduction.



SS-41-Chem.

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