HBSE Class 11 Question Paper 2021 Chemistry

Code No. 1529
CLASS : 11th (Eleventh) Series : 11-April/2021
Roll No.











jlk;u foKku
CHEMISTRY
[ fgUnh ,oa vaxzsth ek/;e ]
[ Hindi and English Medium ]
(Only for Fresh/School Candidates)

le; : 2 21 ?k.Vs ] [ iw.kk±d : 70

Time allowed : 2 21 hours ] [ Maximum Marks : 70

• Ñi;k tk¡p dj ysa fd bl iz'u-i= esa eqfnzr i`"B 16 rFkk iz'u 47 gSaA
Please make sure that the printed pages in this question paper are 16 in number
and it contains 47 questions.
• iz'u-i= esa lcls Åij fn;s x;s dksM uEcj dks Nk= mÙkj-iqfLrdk ds eq[;-i`"B ij fy[ksaA
The Code No. on the top 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.
• 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
Candidates must write their Roll Number on the question paper.
• d`i;k iz'uksa dk 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 question, ensure that you have been supplied the correct and
complete question paper, no claim in this regard, will be entertained after
examination.

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lkekU; funsZ'k %
General Instructions :

(i) lHkh iz'u vfuok;Z gSaA
All questions are compulsory.

(ii) çR;sd ç'u ds vad mlds lkeus n'kkZ, x, gSaA
Marks of each question are indicated against it.

(iii) ç'u Øekad 1 ls 35 rd oLrqfu"B ç'u gSaA çR;sd ç'u 1 vad dk gS ftuds lgh mÙkj viuh
mÙkj-iqfLrdk esa fy[kus gSaA
Question Nos. 1 to 35 are objective type questions carrying 1 mark each.
Candidate have to write the correct answer in their answer-book.

(iv) ç'u Øekad 36 ls 40 rd vfr-y?kwÙkjkRed ç'u gSaA çR;sd ç'u 2 vadksa dk gSA çR;sd ç'u dk
mÙkj yxHkx 30 'kCnksa esa nhft,A
Question Nos. 36 to 40 are very short answer type questions carrying
2 marks each. Answer these in about 30 words each.

(v) ç'u Øekad 41 ls 45 rd y?kwÙkjkRed ç'u gSaA çR;sd ç'u 3 vadksa dk gSA çR;sd ç'u dk mÙkj
yxHkx 40 'kCnksa esa nhft,A
Question Nos. 41 to 45 are short answer type questions carrying 3 marks
each. Answer these in about 40 words each.

(vi) ç'u Øekad 46 ,oa 47 nh?kZ mÙkjkRed ç'u gSaA çR;sd ç'u 5 vadksa dk gSA çR;sd ç'u dk mÙkj
yxHkx 70 'kCnksa esa nhft,A
Question Nos. 46 & 47 are long answer type questions carrying 5 marks
each. Answer these in about 70 words each.

(vii) ç'u-i= esa lexz :i ls dksbZ fodYi ugha gSA rFkkfi 5 vadksa okys nksuksa ç'uksa esa vkarfjd p;u
çnku fd;k x;k gSA ,sls ç'uksa esa ls vkidks dsoy ,d gh ç'u djuk gSA
There is no overall choice. However, internal choice is given in both long
answer type questions of 5 marks each. You have to attempt only one of the
given choice in such questions.

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1. 64 g vkWDlhtu esa fdrus eksy gSa \ 1

(A) 1.5 (B) 2.0

(C) 2.5 (D) 3.0

Number of moles in 64 g of Oxygen are :

(A) 1.5 (B) 2.0

(C) 2.5 (D) 3.0

2. ukbVªkstu ijek.kq esa fdrus v;qfXer bysDVªkWu gksrs gSa \ 1

(A) 1 (B) 2

(C) 3 (D) 4

Find number of unpaired electrons in Nitrogen atom :

(A) 1 (B) 2

(C) 3 (D) 4

3. B, C, N, F rFkk Si rÙoksa ds v/kkrq vfHky{k.k dk lgh Øe gS % 1

(A) B > C > Si > N > F

(B) Si > C > B > N > F

(C) F > N > C > B > Si

(D) F > N > C > Si > B

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Arrange B, C, N, F and Si in correct order of their non-metallic character.

(A) B > C > Si > N > F

(B) Si > C > B > N > F

(C) F > N > C > B > Si

(D) F > N > C > Si > B

4. vk/kqfud vkorZ lkj.kh esa fdruh {kSfrt iafDr;k¡ gSa \ 1

(A) 2 (B) 6

(C) 7 (D) 8

How many horizontal rows in Modern periodic table ?

(A) 2 (B) 6

(C) 7 (D) 8

5. dkSu-lk ;kSfxd 'kwU; f}/kzqo vk?kw.kZ fn[kkrk gS \ 1

(A) CCl 4 (B) H 2O

(C) SO 2 (D) H 2S

Which compound shows zero dipole moment ?

(A) CCl 4 (B) H 2O

(C) SO 2 (D) H 2S

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6. H 2S v.kqvksa esa fdl çdkj dk varjk-v.kqd cy gksrk gS \ 1

(A) f}/kzqo-f}/kzqo cy

(B) f}/kzqo çsfjr f}/kzqo cy

(C) çdh.kZu cy

(D) gkbMªkstu ca/k

Which type of intermolecular force exists in H 2S molecules ?

(A) Dipole-dipole forces

(B) Dipole-induced dipole forces

(C) Dispersion forces

(D) Hydrogen bond

7. fdl 'krZ ij okLrfod xSl] ,d vkn'kZ xSl ds :i esa O;ogkj djrh gS \ 1

(A) vf/kd rkieku] de nkc

(B) de rkieku] vf/kd nkc

(C) vf/kd rkieku] vf/kd nkc

(D) de rkieku] de nkc

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A real gas acts as an ideal gas under which condition ?

(A) High temperature, low pressure

(B) Low temperature, high pressure

(C) High temperature, high pressure

(D) Low temperature, low pressure

8. lHkh rÙoksa dh ,aFkSYih mudh lanHkZ-voLFkk esa gksrh gS \ 1

(A) bdkbZ (B) 'kwU;

(C) <0 (D) >0

The enthalpies of all elements in their standard states are :

(A) Unity (B) Zero

(C) <0 (D) >0

9. nw/k dk pH fdruk gS \ 1

(A) 7.4 (B) 9.2

(C) 7.8 (D) 6.8

The pH of milk is :

(A) 7.4 (B) 9.2

(C) 7.8 (D) 6.8

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10. KMnO 4 esa Mn dh vkWDlhdj.k la[;k D;k gS \ 1

(A) +1 (B) +5

(C) +7 (D) +3

The oxidation number of Mn in KMnO 4 is :

(A) +1 (B) +5

(C) +7 (D) +3

11. NO 3− esa ukbVªkstu dh vkWDlhdj.k la[;k D;k gS \ 1

(A) −3 (B) +1

(C) +3 (D) +5

The oxidation number of Nitrogen in NO 3− is :

(A) −3 (B) +1

(C) +3 (D) +5

12. Hkkjh ty fdls dgrs gSa \ 1

(A) H 2O (B) H 2O 2

(C) D 2O (D) D2O 2

Which is heavy water ?

(A) H 2O (B) H 2O 2

(C) D 2O (D) D2O 2

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13. H 2 cukus ds fy, ruq H 2SO 4 ds lkFk fdl /kkrq dk ç;ksx fd;k tkrk gS \ 1

(A) Cu (B) Hg

(C) Ag (D) Zn

Which metal is used to prepare H 2 with dil. H 2SO 4 ?

(A) Cu (B) Hg

(C) Ag (D) Zn

14. csfdax lksMk dk lw= D;k gS \ 1

(A) NaHCO3 (B) Na 2CO 3

(C) NaOH (D) KOH

What is formula of Baking Soda ?

(A) NaHCO3 (B) Na 2CO 3

(C) NaOH (D) KOH

15. fdl {kkjh; /kkrq dk tyh; yo.k curk gS \ 1

(A) Li (B) Na

(C) K (D) Cs

Which alkali metal gives hydrated salt ?

(A) Li (B) Na

(C) K (D) Cs

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16. Å"ekxfrdh; :i esa dkcZu dk lokZf/kd LFkk;h :i dkSu-lk gS \ 1

(A) dks;yk (B) xzsQkbV

(C) QqyjhUl (D) ghjk

Thermodynamically the most stable form of Carbon is :

(A) Coal (B) Graphites

(C) Fullerenes (D) Diamond

17. Cn H 2n fdldk lkekU; lw= gS \ 1

(A) ,Ydhu (B) ,Ydsu

(C) ,YdkbZu (D) ,jhu

Cn H 2n is general formula of :

(A) alkene (B) alkane

(C) alkyne (D) arene

18. lksfM;e csatks,V rFkk lksMk-ykbe feJ.k dks xeZ djus ls D;k curk gS \ 1

(A) ehFksu (B) csUthu

(C) bZFksu (D) çksisu

Heating a mixture of sodium benzoate with soda-lime gives :

(A) Methane (B) Benzene

(C) Ethane (D) Propane

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19. 10.4107 dks rhu lkFkZd vadksa rd fudfVr dhft,A 1

Round up 10.4107 upto three significant figures.

20. fuEufyf[kr Lih'kht esa fdldk vkdkj U;wure gksxk \ 1

Mg, Mg 2 + , Al, Al 3 +

Which of the following species will have smallest size ?

Mg, Mg 2 + , Al, Al 3 +

21. S-CykWd rÙoksa dk lkekU; bysDVªkWfud foU;kl fyf[k,A 1

Write general electronic configuration of S-block elements.

22. pkYlZ dk fu;e D;k gS \ 1

What is Charle's Law ?

23. ckW;y ds fu;e esa D;k fLFkj gksrk gS \ 1

What is Constant in Boyle's Law ?

24. vip;u fof/k D;k gS \ 1

What is reduction process ?

25. fuEufyf[kr vfHkfØ;k esa vkWDlhdkjd dkSu gS \ 1

Zn + 2HCl → ZnCl 2 + H 2

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Which is oxidizing agent in the following reaction ?

Zn + 2HCl → ZnCl 2 + H 2

26. {kkjh; /kkrq çÑfr esa D;ksa ugha ik;h tkrh gS \ 1

Why are alkali metals not found in nature ?

27. 1 feyhxzke = --------------- fdyksxzkeA 1

1 milligram = ………….. kilogram.

28. Mg rFkk N ls cuus okyk f}vaxh ;kSfxd -------------- gSA 1

Binary compound formed by Mg and N is ……………. .

29. çR;sd xzkQ dh js[kk tks V rFkk T ls cukbZ tkrh gS] ftlesa nkc fLFkj gksrk gS ------------- dgykrh
gSA 1

Each line of V Vs T graph at constant pressure is called ……………. .

30. ,d vfHkfØ;k esa bysDVªkWu nsus okyk ------------- dgykrk gSA 1

In a reaction donor of electrons called ……………. .

31. CuSO 4 .5H 2O esa milgla;kstu vkca/k ikuh ds v.kqvksa dh la[;k ------------- gSA 1

……………. number of coordinated bonded water molecules in CuSO 4 .5H 2O .

32. oxZ 15, 16, 17 ds gkbMªkbM --------------- dgykrs gSAa 1

Group 15, 16, 17 hydrides called …………… .

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33. Na 2O esa Na dh vkWDlhdj.k la[;k --------------- gSA 1

……………. is oxidation state of Na in Na 2O .

34. oxZ 2 Be, Mg, Ca, Sr, Ba /kkrq ----------- dgykrs gSaA 1

Group 2 Be, Mg, Ca, Sr, Ba are called ……………. metals.

35. xzsQkbV esa dkcZu dh ladj.k ------------- çdkj dh gSA 1

The type of hybridization of carbon in graphite is ……………. .

36. KOH ds foy;u dh eksyjrk dk ifjdyu dhft,] ftls 5.6 g KOH dks ty esa feykdj çkIr fd;k

x;k gks] rkfd foy;u ds 250 mL çkIr gks tk,¡A 2

Calculate the molarity of KOH in the solution prepared by dissolving its 5.6 g
in water to form 250 mL of solution.

37. 5800 Å rjaxnS?;Z okys fofdj.k dh vko`fÙk dh x.kuk dhft,A 2

Calculate frequency of radiation having wavelength 5800 Å.

38. ngu ,aFkSYih D;k gS \ ,d mnkgj.k nhft,A 2

What is enthalpy of Combustion ? Give one example.

39. czkUWLVsM vEyksa HF rFkk H 2SO 4 ds la;qXeh {kkjd D;k gksaxs \ 2

What will be the conjugate bases for the Bronsted acids HF and H 2SO 4 ?

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40. ukfHkdjkxh D;k gSa \ blds çdkj mnkgj.k lfgr nhft,A 2

What are Nucleophiles ? Give its types with examples.

41. ikmyh viotZu fl)kar dh mnkgj.k lfgr O;k[;k djsaA 3

Explain Pauli Exclusion principle with example.

42. [kqyk fudk;] foLrh.kZ xq.k rFkk ,aFkSYih dks ifjHkkf"kr djsaA 3

Define open system, extensive properties and enthalpy.

43. vkjsfu;l /kkj.kk esa vEy rFkk {kkjd dks mnkgj.k lfgr ifjHkkf"kr djsaA 3

Define acid and base with example in Arrhenius concept.

44. fuEufyf[kr ds ckjs esa vki D;k tkurs gSa \ 3

(a) vfØ; ;qxy çHkko

(b) vi:irk

(c) Ük`a[kyu ço`fÙk

What do you understand by the following ?

(a) inert pair effect

(b) allotropy

(c) catenation

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45. fuEufyf[kr ds IUPAC uke fyf[k, % 3

(a) CN

O

(b)
OH

Br

(c)

Cl

Give IUPAC names of the following :

(a) CN

O
(b)

OH

Br

(c)

Cl

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46. vkca/k dksfV ls vki D;k le>rs gSa \ N 2 ] O 2 ] O 2+ rFkk O 2− esa vkca/k dksfV dk ifjdyu dhft,A

5

What is meant by the term Bond Order ? Calculate the bond order of N 2 ] O 2 ]

O 2+ and O 2− .

vFkok

OR

ijek.kq d{kdksa ds ladj.k ls vki D;k le>rs gSa \ sp, sp 2 rFkk sp 3 ladj d{kdksa dh vkÑfr dk
mnkgj.k lfgr o.kZu dhft,A 5

What is meant by hybridization of atomic orbitals ? Describe the shapes of sp,

sp 2 and sp 3 hybrid orbitals with examples.

47. (i) ÝhMsy-Øk¶V ,sfYdyu vfHkfØ;k D;k gS \ 2

What is Friedel-Crafts alkylation reaction ?

(ii) ekdksZuhdkWQ fu;e D;k gS \ mnkgj.k lfgr O;k[;k dhft,A 3

What is Markovnikov's rule ? Explain with example.

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vFkok

OR

(i) oqV~Zl vfHkfØ;k D;k gS \ 2

What is Wurtz reaction ?

(ii) çfr-ekdksZuhdkWQ fu;e D;k gS \ mnkgj.k lfgr O;k[;k dhft,A 3

What is anti-Markovnikov's rule ? Explain with example.

S

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