HBSE Class 12 Question Paper 2023 Chemistry

CLASS : 12th (Sr. Secondary) Code No. 229
Series : SS/Annual-2023
Roll No. SET : A
jlk;u foKku
CHEMISTRY
[ Hindi and English Medium ]

ACADEMIC/OPEN

(Only for Fresh/Re-appear/Improvement/Additional Candidates)

Time allowed : 3 hours ] [ Maximum Marks : 70

• Ñi;k tk¡p dj ysa fd bl iz'u&i= esa eqfnzr i`"B 16 rFkk iz'u 20 gSaA
Please make sure that the printed pages in this question paper are 16 in number
and it contains 20 questions.

• iz'u&i= esa nkfgus gkFk dh vksj fn;s x;s dksM uEcj rFkk lsV dks Nk= mÙkj&iqfLrdk ds eq[;&i`"B ij
fy[ksaA
The Code No. and Set on the right side of the question paper should be written by
the candidate on the front page of the answer-book.

• Ñi;k iz'u dk mÙkj fy[kuk 'kq: djus ls igys] iz'u dk Øekad vo'; fy[ksaA
Before beginning to answer a question, its Serial Number must be written.

• mÙkj&iqfLrdk ds chp esa [kkyh iUuk@iUus u NksMsa+A
Don’t leave blank page/pages in your answer-book.

229/(Set : A) P. T. O.

(2) 229/(Set : A)
• mÙkj&iqfLrdk ds vfrfjDr dksbZ vU; 'khV ugha feysxhA vr% vko';drkuqlkj gh fy[ksa vkSj fy[kk mÙkj u
dkVsaA
Except answer-book, no extra sheet will be given. Write to the point and do not
strike the written answer.
• ijh{kkFkhZ viuk jksy ua0 iz'u&i= ij vo'; fy[ksaA jksy ua0 ds vfrfjDr iz'u&i= ij vU; dqN Hkh u
fy[ksa vkSj oSdfYid iz'uksa ds mÙkjksa ij fdlh izdkj dk fu'kku u yxk,¡A
Candidates must write their Roll No. on the question paper. Except Roll No. do not
write anything on question paper and don't make any mark on answers of objective
type questions.
• d`i;k iz'uksa ds mÙkj nsus lss iwoZ ;g lqfuf'pr dj ysa fd iz'u&i= iw.kZ o lgh gS] ijh{kk ds mijkUr bl
lEcU/k esa dksbZ Hkh nkok Lohdkj ugha fd;k tk;sxkA
Before answering the questions, ensure that you have been supplied the correct and
complete question paper, no claim in this regard, will be entertained after
examination.

lkekU; funsZ'k %
(i) LkHkh iz'u vfuok;Z gSaA
(ii) izR;sd iz'u ds vad mlds lkeus n'kkZ, x, gSaA
(iii) ç'u la[;k 1 esa iUnzg (i - xv) oLrqfu"B izdkj ds iz'u gSAa izR;sd iz'u 1 vad dk gSA ftuds lgh
mÙkj viuh mÙkj&iqfLrdk esa fy[kus gSaA
(iv) ç'u la[;k 2 ls 9 rd vfry?kq mÙkjh; ç'u gSaA çR;sd iz'u 2 vadksa dk gSA izR;sd iz'u dk mÙkj
yxHkx 30 'kCnksa esa nhft,A
(v) ç'u la[;k 10 ls 17 rd y?kq mÙkjh; ç'u gSaA çR;sd ç'u 3 vadksa dk gSA izR;sd iz'u dk mÙkj
yxHkx 40 'kCnksa esa nhft,A

229/(Set : A)

(3) 229/(Set : A)
(vi) ç'u la[;k 18 ls 20 rd nh?kZ mÙkjh; ç'u gSaA çR;sd ç'u 5 vadksa dk gSA izR;sd iz'u dk mÙkj
yxHkx 70 'kCnksa esa nhft,A
(vii) iz'u-i= esa lexz :i ls dksbZ fodYi ugha gSA rFkkfi 5 vadksa okys lHkh nh?kZ mÙkjh; iz'uksa esa
vkarfjd p;u iznku fd;k x;k gSA ,sls iz'uksa esa ls vkidks dsoy ,d gh iz'u djuk gSA
General Instructions :

(i) All questions are compulsory.

(ii) Marks for each question are indicated against it.

(iii) Question Number 1 consists of fifteen (i-xv) objective type questions carrying
1 mark each. Candidates have to write the correct answer in their answer-
book.

(iv) Question Numbers 2 to 9 are very short answer type questions of 2 marks
each. Answer these in about 30 words each.

(v) Question Numbers 10 to 17 are short answer type questions of 3 marks
each. Answer these in about 40 words each.

(vi) Question Numbers 18 to 20 are long answer type questions of 5 marks each.
Answer these in about 70 words each.

(vii) There is no over all choice. However, internal choice is given in all long
answer type questions of 5 marks each. You have to attempt only one of the
given choice in such questions.

229/(Set : A) P. T. O.

(4) 229/(Set : A)
[ oLrqfu"B iz'u ]

[ Objective Type Questions ]

1. (i) leijkljh foy;uksa esa leku gksrk gS % 1

(A) lkUnzrk (B) ijklj.k nkc
(C) i`"Bh; ruko (D) ';kurk

Isotonic solutions are those solutions which have same :

(A) Concentration (B) Osmotic Pressure

(C) Surface Tension (D) Viscocity

(ii) LVSaMMZ gkbMªkstu bysDVªksM (SHE) ds fy, LVSaMMZ bysDVªksM iksVsfU'k;y gS % 1

(A) –0.5 V (B) + 1.0 V

(C) 0.0 V (D) + 2.0 V

Standard Electrode Potential for Standard Hydrogen Electrode (SHE) is :

(A) –0.5 V (B) + 1.0 V

(C) 0.0 V (D) + 2.0 V

229/(Set : A)

(5) 229/(Set : A)
(iii) fuEufyf[kr osx fLFkjkad ls vfHkfØ;k dh dksfV Kkr dhft, % 1

K = 1.6 × 10 −6 L Mol −1 Sec −1

(A) 'kwU; (B) izFke

(C) f}rh; (D) buesa ls dksbZ ugha
Identify the order of reaction from the given rate constant
K = 1.6 × 10 −6 L Mol −1 Sec −1 :

(A) Zero (B) First

(C) Second (D) None of these

(iv) ;kSfxd [Co (NH 3 )5 (CO3 ) ] Cl esa dksckYV dh milgla;kstdrk D;k gS \ 1

(A) 4 (B) 6

(C) 8 (D) 5

What is the co-ordination number of Cobalt in the [Co (NH 3 )5 (CO3 ) ] Cl
compound ?

(A) 4 (B) 6

(C) 8 (D) 5

229/(Set : A) P. T. O.

(6) 229/(Set : A)
(v) fuEufyf[kr esa ls fdldk f}/kqzo vk?kw.kZ lokZf/kd gksxk \ 1
(A) CHCl3 (B) CH 3Cl

(C) CH 2Cl 2 (D) CCl4

Which one of the following has the highest dipole moment ?
(A) CHCl3 (B) CH 3Cl

(C) CH 2Cl 2 (D) CCl4

(vi) 373
vfHkfØ;k C 6 H 5OCH 3 + HI  K
 → A + B esa] A vkSj B gSa % 1

(A) C 6 H 5 I , CH 3OH

(B) C 6 H 5OH , CH 3 I

(C) C 6 H 5CH 2OH , CH 3 I

(D) CH 3CH 2 I , C 6 H 5OH

373
In the reaction C 6 H 5OCH 3 + HI  K
 → A + B , A and B are :

(A) C 6 H 5 I , CH 3OH

(B) C 6 H 5OH , CH 3 I

(C) C 6 H 5CH 2OH , CH 3 I

(D) CH 3CH 2 I , C 6 H 5OH

229/(Set : A)

(7) 229/(Set : A)
(vii) ;kSfxd C 6H 5CH = CHCHO dk IUPAC uke ………….. gSA 1

IUPAC name of the compound C 6H 5CH = CHCHO is ………….. .

(viii) ,sfFky ,sehu ty esa ?kqyu'khy gSA ysfdu ,sfuyhu ty esa ?kqyu'khy ugha gSA 1

Ethyl amine is soluble in water but Aniline does not.

(ix) fuEu esa ls dkSu-lk {kkjd RNA esa gS ysfdu DNA esa ugha \ 1

(A) Fkk;ehu (B) lkbVkslhu

(C) Xokuhu (D) ;wjsfly

Which base is present in RNA but not in DNA ?

(A) Thymine (B) Cytosine

(C) Guanine (D) Uracil

(x) vfHkfØ;k dh dksfV gS ………….., tc K = 3 × 10 −4 S −1 . 1
Order of reaction is ………….., when K = 3 × 10 −4 S −1 .

229/(Set : A) P. T. O.

(8) 229/(Set : A)
(xi) fuEu lehdj.k dks iwjk dhft, % 1

Conc . H SO 4
CH 3CH 2OH    2  → .............
443 K

Complete the following equation :

Conc . H SO 4
CH 3CH 2OH    2  → .............
443 K

(xii) foVkfeu ^Mh* dh deh ls gksus okyh chekjh ………….. gSA 1

Deficiency of Vitamin 'D' causes ………….. .

(xiii) leijkljh foy;u D;k gSa \ 1

What are isotonic solutions ?

(xiv) K 3 [Fe (CN )6 ] ;kSfxd dk IUPAC uke fyf[k,A 1

Write IUPAC name of K 3 [Fe (CN )6 ] Compound.

(xv) QhukWy] ,sYdksgy ls T;knk vEyh; D;ksa gS \ 1

Why Phenol is more Acidic then Alcohol ?

229/(Set : A)

(9) 229/(Set : A)
[ vfry?kq mÙkjh; iz'u ]

[ Very Short Answer Type Questions ]

2. ml foy;u dh eksyjrk dh x.kuk dhft, ftlesa 4g NaOH, 200 ml foy;u esa ?kqyk gqvk gSA 2

Calculate the Molarity of a solution containing 4g NaOH in 200 ml of solution.

3. mRizsjd rFkk lfØ;.k ÅtkZ dks ifjHkkf"kr dhft,A 2

Define Catalyst and Activation Energy.

4. leUo; la[;k fdls dgrs gSa \ [PtCl6 ]−2 esa IysfVue dh leUo; la[;k Kkr djsaA 2

What is co-ordination number ? What will be the co-ordination number of Pt in
−2
[PtCl6 ] ?

5. fuEufyf[kr gSykstu ;kSfxd tksM+ksa esa ls dkSu rhoz SN 2 vfHkfØ;k nsxk ? 2

(i) CH 2Cl vkSj Cl

(ii) I vkSj Cl

In the following pairs of halogen compound which would undergo SN 2 reaction
faster ?

(i) CH 2Cl and Cl

(ii) I and Cl

229/(Set : A) P. T. O.

( 10 ) 229/(Set : A)
6. laØe.k /kkrq,¡ rFkk muds vf/kdka'k ;kSfxd vuqpqacdh; D;ksa gSa \ 2

Why transition metals and many of their compounds show paramagnetic
behaviour ?

7. dksYcs vfHkfØ;k dh mnkgj.k lfgr O;k[;k dhft,A 2

Explain with example Kolbe's reaction.

8. dkj.k crkb, fd] D;ksa ,sFksukWy dk DoFkukad esFkkWDlhesFksu ls vf/kd gS \ 2

Give reason for the higher boiling point of ethanol in comparison to
methoxymethane ?

9. xkVjeku vfHkfØ;k fyf[k,] xkVjeku vfHkfØ;k dks lSUMek;j vfHkfØ;k ls vf/kd izkFkfedrk D;ksa nh tkrh
gS \ 2

Write down the Gattermann reaction, and why this reaction preferred over
Sandmeyer reaction ?
[ y?kq mÙkjh; iz'u ]
[ Short Answer Type Questions ]

10. (i) gsujh dk fu;e rFkk nks vuqiz;ksx nhft,A 2

State Henry's law and give two applications.

(ii) rki c<+kus ij xSlksa dh nzoksa esa foys;rk esa ges'kk deh vkus dh izo`fÙk D;ksa gksrh gS \ 1
Why do gases always tend to be less soluble in liquids as the temperature is
raised ?

229/(Set : A)

( 11 ) 229/(Set : A)
11. fuEufyf[kr ds vip;u ;k vkWDlhdj.k ds fy, fdrus vkos'k dwykWe dh vko';drk gS \

(i) ,d eksy Al 3 + dks Al 1

(ii) ,d eksy H 2O dks O 2 1

(iii) ,d eksy MnO4− dks Mn 2 + 1
How much charge required in Coulomb for the following reductions or
oxidations ?
(i) 1 mole of Al 3 + to Al
(ii) 1 mole of H 2O to O 2
−
(iii) 1 mole of MnO 4 to Mn 2 +

12. ,d izFke dksfV dh vfHkfØ;k esa 30% fo;kstu gksus esa 40 feuV yxrs gSaA t1/2 dh x.kuk dhft,A 3

A first order reaction takes 40 min. for 30% decomposition. Calculate half-life
period.

13. ,dnUrh] f}nUrh ,oa mHk;nUrh fyxs.M D;k gS \ izR;sd dk mnkgj.k nhft,A 3

What is meant by unidentate, didentate, and ambidentate ligand ? Give an
example of each.

14. laf{kIr fVIi.kh fy[ksa %
(a) fÝ;kWu 1

(b) Mh0 Mh0 Vh0 1

(c) VsVªkDyksjksehFksu 1

229/(Set : A) P. T. O.

( 12 ) 229/(Set : A)
Write short notes on :
(a) Freon
(b) D.D.T.
(c) Tetrachloromethane

15. ,FksukWy ds vEyh; futZyu ls ,Fkhu izkIr djus ds rhu pj.kksa dh fØ;kfof/k fyf[k,A 3

Write three steps mechanism of acid dehydration of ethanol to yield ethene.

16. (i) ;qXeu vfHkfØ;k ij y?kq fVIi.kh fyf[k,A 2

Write short note on coupling reaction.

(ii) izkFkfed ,sehu ds la'ys"k.k esa xSfcz,y FkSfyekbM la'ys"k.k dks izkFkfedrk D;ksa nh tkrh gS \ 1

Why Gabriel phthalimide synthesis is preferred for synthesizing primary
amines ?

17. (i) LVkpZ rFkk lsyqyksl esa eq[; lajpukRed vUrj D;k gS \ 2

What is the basic structural difference between starch and cellulose ?

(ii) vuko';d ,sehuks vEy D;k gksrs gSa \ 1

What are non-essential amino acid ?
[ nh?kZ mÙkjh; iz'u ]
[ Long Answer Type Questions ]
18. (i) QSjkMs ds fo|qr vi?kV~; ds nksuksa fu;eksa dk o.kZu djsAa 3
Explain the both laws of Faraday Electrolysis.

229/(Set : A)

( 13 ) 229/(Set : A)
(ii) Ni (NO 3 )2 ds ,d foy;u dk IySfVue bysDVªksMksa ds chp 5 ,sfEi;j dh /kkjk izokfgr djrs gq,

20 feuV rd fo|qr~ vi?kVu fd;k x;k] Ni dh fdruh ek=k dSFkksM ij fu{ksfir gksxh \
(Ni = 58.7) 2

A solution of Ni (NO 3 )2 is electrolysed between platinum electrode using a
current of 5 ampere for 20 min., what mass of Ni is deposited at cathode ?
(Ni = 58.7)

vFkok

OR

(i) oS|qrjklk;fud Js.kh D;k gS \ blds vuqiz;ksx nhft,A 3

What is electrochemical series ? Give its applications.

(ii) ;fn ,d /kkfRod rkj esa 0.5 ,sfEi;j dh /kkjk 2 ?kaVksa ds fy, izokfgr gksrh gS] rks rkj esa ls fdrus
bysDVªkWu izokfgr gksaxs \ 2

If a current of 0.5 ampere flows through a metallic wire for 2 hours, then
how many electrons would flow through the wire ?

19. dkj.k nsrs gq, Li"V/o.kZu djsa %
(i) laØe.k rÙo ,oa muds ;kSfxd vuqpqEcdh; O;ogkj D;ksa fn[kkrs gSa \ 1

(ii) laØe.k rÙoksa dh d.ku ,sUFkSYih vf/kd D;ksa gksrh gS \ 1

229/(Set : A) P. T. O.

( 14 ) 229/(Set : A)
(iii) laØe.k rÙo lkekU;r;k jaxhu ;kSfxd D;ksa cukrs gSa \ 1

(iv) laØe.k rÙo vPNs mRiszjd D;ksa gS \ 1

MnO 4 vk;u dh lajpuk cukb,A
−
(v) 1

Explain giving reason :

(i) Transition metal and many of their compounds show paramagnetic
behaviour.

(ii) The enthalpy of atomization of the transition metal are high.

(iii) The transition metal generally forms coloured compounds.

(iv) Transition metal acts as good catalyst.

−
(v) Draw the structure of MnO 4 Ion.

vFkok

OR

(i) ikbjksyqlkbV v;Ld ls KMnO4 cukus ds fy, fofHkUu inksa dk mYys[k dhft,A 3

Describe the preparation of KMnO4 from Pyrolusite ore.

(ii) feJkrq,¡ D;k gSa \ nks mnkgj.k nhft,A 2

What are alloys ? Give two examples.

229/(Set : A)

( 15 ) 229/(Set : A)
20. (a) fuEu dk o.kZu djsa % 2

(i) dSfutkjks vfHkfØ;k

(ii) fMdkcksZfDlys'ku

(b) ,sFksuy dks fuEu esa ifjofrZr djsa % 3

(i) C;wVsu 1, 3-MkbZvkWy

(ii) C;wV 2-busy
(iii) C;wV-2 buksbd ,sflM

(a) Describe the following :

(i) Cannizaro Reaction

(ii) Decarboxylation

(b) Convert Ethanal into following :

(i) Ethanal to Butane 1,3-diol

(ii) Ethanal to But 2-enal

(iii) Ethanal to But-2 enoic acid

229/(Set : A) P. T. O.

( 16 ) 229/(Set : A)
vFkok
OR

vfHkfØ;k dk lehdj.k }kjk o.kZu dhft, %
(i) ØkWl ,sYMksy la?kuu vfHkfØ;k 2

(ii) gsy-QksykMZ tsfyaLdh vfHkfØ;k 2

(iii) ,LVjhdj.k 1

Describe the reaction with the help of equation :

(i) Cross Aldol condensation reaction

(ii) Hell-Volhard-Zelinsky reaction

(iii) Esterification

S

229/(Set : A)