TN 12th Question Paper 2023 Chemistry

Tamil Nadu
State Board

2023
QUESTION
PAPER

No. of Printed Pages : 11
6622
£vÄ Gs
A Register Number

!6622Chemistry!
PART - III
÷Áv°¯À/CHEMISTRY
( uªÌ ©ØÖ® B[Q» ÁÈ / Tamil & English Version )

Põ» AÍÄ : 3.00 ©o ÷|µ® ] [ ö©õzu ©v¨ö£sPÒ : 70
Time Allowed : 3.00 Hours ] [Maximum Marks : 70

AÔÄøµPÒ : (1) AøÚzx ÂÚõUPЮ \›¯õP¨ £vÁõQ EÒÍuõ GߣuøÚ \›£õºzxU
öPõÒÍÄ®. Aa_¨£vÂÀ SøÓ°¸¨¤ß, AøÓU PsPõo¨£õÍ›h®
EhÚi¯õPz öu›ÂUPÄ®.
(2) }»® AÀ»x P¸¨¦ ø©°øÚ ©mk÷© GÊxÁuØS®
AiU÷PõikÁuØS® £¯ß£kzu ÷Ásk®. £h[PÒ ÁøµÁuØS
ö£ß]À £¯ß£kzuÄ®.
Instructions : (1) Check the question paper for fairness of printing. If there is any lack of
fairness, inform the Hall Supervisor immediately.
(2) Use Blue or Black ink to write and underline and pencil to draw
diagrams.

SÔ¨¦ : ÷uøÁ¯õÚ ChzvÀ £h® Áøµ¢x, \©ß£õkPøÍ GÊuÄ®.
Note : Draw diagrams and write equations wherever necessary.

£Sv - I / PART - I

SÔ¨¦ : (i) AøÚzx ÂÚõUPÐUS® Âøh¯ÎUPÄ®. 15x1=15
(ii) öPõkUP¨£mkÒÍ ©õØÖ ÂøhPÎÀ ªPÄ® Hئøh¯ Âøhø¯z
÷uº¢öukzx SÔ±mkhß Âøh°øÚ²® ÷\ºzx GÊuÄ®.
Note : (i) Answer all the questions.

(ii) Choose the most appropriate answer from the given four alternatives
and write the option code and corresponding answer.

[ v¸¨¦P / Turn over

6622 2

1. ö©UÜæ¯õ £õÀ©® __________ BP £¯ß£kQÓx.
(A) ©Ú Aø©v£kzv (B) Á¼ {Áõµo
(C) Aª» }UQ (D) EnºÄ }UQ
Milk of Magnesia is used as __________.

(a) Tranquilizer (b) Analgesic

(c) Antacid (d) Anaesthetic

2. J¸ ÷Áv ÂøÚ°ß÷£õx ÷\ºUP¨£k® ÂøÚ÷ÁP ©õØÔ ¤ßÁ¸ÁÚÁØÖÒ
GuøÚ ©õØÔ¯ø©UQÓx ?
(A) Gßm÷µõ¤ (B) AP BØÓÀ
(C) Q꼀 BØÓÀ (D) GßuõÀ¤
The addition of a catalyst during a chemical reaction alters, which of the following
quantities ?

(a) Entropy (b) Internal energy

(c) Activation energy (d) Enthalpy

3. íõÀ öíµõÀm ö\¯À•øӰߣi ¤›zöukUP¨£k® E÷»õP® :
(A) Cu (B) Al (C) Zn (D) Ni
The metal extracted by Hall-Heroult process is :

(a) Cu (b) Al (c) Zn (d) Ni

4. ¤ßÁ¸ÁÚÁØÖÒ 1.73 BM Põ¢uz v¸¨¦zvÓß ©v¨¤øÚ ö£ØÖÒÍx :
2+
(A) [CoCl 6 ]4− (B) TiCl4 (C) Cu ( NH3 )4  (D) Ni ( CN ) 4  2−

A magnetic moment of 1.73 BM will be shown by one among the following :

2+
(a) [CoCl6 ] 4− (b) TiCl4 (c) Cu ( NH 3 )  (d) Ni ( CN ) 4  2−
 4

A

3 6622

5. ¤ßÁ¸ÁÚÁØÖÒ Gx \›¯õP¨ ö£õ¸¢v²ÒÍx ?
(A) ~øµ¨¦ - £Û‰mh®

(B) £õÀ©® - ¦øP
(C) TÌ©U Pøµ\À - P»UP¨£mh UŸ®
(D) PÎ - öÁsön´

Which one is correctly matched ?

(a) Foam - mist

(b) Emulsion - smoke

(c) Sol - whipped cream

(d) Gel - butter

6. ¤ßÁ¸ÁÚÁØÖÒ Gøu ÷\ºUS® ÷£õx RÌPsh ¤›øPa \©{ø» ÂøÚ°À
ö£õx A¯Û ÂøÍøÁ E¸ÁõUS® ?

CH3COOH(aq) ⇌ CH3COO−(aq) +H+(aq)

(A) CH3COCl (B) AgCl (C) CH3Cl (D) HCl
Which one of the following will cause common-ion-effect when added to the
following dissociation equilibrium reaction ?

CH3COOH(aq) ⇌ CH3COO−(aq) +H+(aq)

(a) CH3COCl (b) AgCl (c) CH3Cl (d) HCl

7. C60 GßÓ Áõ´£õkøh¯ ¦À»ŸÛÀ EÒÍ Põº£ß __________ CÚU P»¨¦øh¯x.

(A) sp2 (B) sp3 (C) sp3d (D) sp

Carbon atoms in Fullerene with formula C60 have __________ hybridisation.

(a) sp2 (b) sp3 (c) sp3d (d) sp

A [ v¸¨¦P / Turn over

6622 4

8. BUiÚõ´kPÎß ö£õxÁõÚ BU]á÷ÚØÓ {ø» :

(A) +4 (B) +2 (C) +6 (D) +3

The most common oxidation state of Actinoids is :

(a) +4 (b) +2 (c) +6 (d) +3

9. TØÖ : öíUì -4- Dßø|m›À &I øhI÷\õ¤³møhÀ A¾ªÛ¯®
øímøµkhß ÂøÚ¨£kzv ¤ß }µõØ£SzuõÀ öíUì -4-
DÚÀ &Iz u¸QÓx.

Põµn® : øhI÷\õ¤³møhÀ A¾ªÛ¯® øímøµk J¸ ÷uº¢u JkUQ
BS®.

(A) TØÖ \› BÚõÀ Põµn® uÁÖ.

(B) TØÖ, Põµn® Cµsk® \›, BÚõÀ Põµn® TØÔØPõÚ \›¯õÚ
ÂÍUP©À».

(C) TØÖ, Põµn® Cµsk® uÁÖ.

(D) TØÖ, Põµn® Cµsk® \›, ÷©¾® Põµn® TØÔØPõÚ \›¯õÚ
ÂÍUP©õS®.

Assertion : Hex-4-ennitrile on reaction with Di-isobutyl aluminium hydride
followed by Hydrolysis gives Hex-4-enal.

Reason : Di-isobutyl aluminium hydride is a selective reducing agent.

(a) Assertion is true but Reason is false.

(b) Both Assertion and Reason are true, but reason is not the correct explanation
of assertion.

(c) Both Assertion and Reason are false.

(d) Both Assertion and Reason are true and reason is the correct explanation
of assertion.

A

5 6622

10. ¤ßÁ¸ÁÚÁØÔÀ Gx Põ©õ PvºÃa]ØS J¸ ‰»©õP £¯ß£kQÓx ?
(A) X e (B) Ar (C) Rn (D) Kr
Which of the following is used as the source of gamma rays ?

(a) Xe (b) Ar (c) Rn (d) Kr

11. vmh øímµáß ªß•øÚ°ß (SHE) emf ©v¨£õÚx __________.
(A) −1.0 (B) 0 (C) 1.1 (D) +1.0
The emf of Standard Hydrogen Electrode (SHE) is __________.

(a) −1.0 (b) 0 (c) 1.1 (d) +1.0

12. E÷»õP® AvP•ÒÍ SøÓ£õk Põn¨£k® £iP® :
(A) NaCl (B) AgBr (C) AgCl (D) FeO
The crystal with metal excess defect is :

(a) NaCl (b) AgBr (c) AgCl (d) FeO

13. ¤ßÁ¸ÁÚÁØÔÀ G¢u Põµ® DNA &ÂÀ CÀø» ?
(A) ³µõ]À (B) AiøÚß (C) ø\m÷hõø\ß (D) SÁõøÚß
Which of the following base is not present in DNA ?
(a) Uracil (b) Adenine (c) Cytosine (d) Guanine

14. ¤ßÁ¸ÁÚÁØÖÒ uõÛ¯[Q C¯¢vµ[PÎß ÷µi÷¯mhºPÎÀ EøÓ Gvº
ö£õ¸ÍõP¨ £¯ß£kÁx Gx ?
(A) ö©zuÚõÀ (B) Dz÷uß-1, 2-øh BÀ
(C) GzuÚõÀ (D) QÍ\µõÀ
Which of the following compound is used as an anti-freeze in automobile radiator ?
(a) Methanol (b) Ethane-1, 2-diol

(c) Ethanol (d) Glycerol

A [ v¸¨¦P / Turn over

6622 6

15. K›øn¯ A«ßPÒ A÷µõ÷©iU BÀiøíkhß ÂøÚ¦›¢x öPõkUS®
ÂøÍö£õ¸Ò :
(A) æL¨ Põµ® (B) Põº£õU]¼U Aª»®
(C) Rm÷hõß (D) A÷µõ÷©iU Aª»®
The product formed by the reaction of an Aromatic aldehyde with primary amines
is :

(a) Schiff’s base (b) Carboxylic acid

(c) Ketone (d) Aromatic acid

£Sv & II/PART - II
SÔ¨¦ : H÷uÝ® BÖ ÂÚõUPÐUS Âøh¯ÎUPÄ®. ÂÚõ Gs 24 &US Pmhõ¯©õP
Âøh¯ÎUPÄ®. 6x2=12

Note : Answer any six questions. Question No. 24 is Compulsory.

16. GÆÁøP uõxUPøÍ Ahº¨¤UP, ~øµªu¨¦ •øÓ HØÓx ? AzuøP¯
uõxUPÐUS C¸ GkzxUPõmkPÒ u¸P.
Which type of ores can be concentrated by froth floatation method ? Give two
examples for such ores.

17. ]¼÷PõßPÎß £¯ßPøÍ GÊxP.
Write the uses of Silicones.

18. AønÄa ÷\º©[PÎÀ ø©¯ Aq GߣuøÚ Áøµ¯ÖUPÄ®.
Define the term central atom in co-ordination compounds.

19. FCC A»SU TmiÀ Põn¨£k® AqUPÎß GsoUøP°øÚU PnUQkP.

Calculate the number of atoms in an FCC unit cell.

A

7 6622

20. Cøn Aª»&Põµ CµmøhPÒ GßÓõÀ GßÚ ?
What is conjugate Acid-Base pairs ?

21. ÂøÚ÷ÁP©õØÓ |a_PÒ GßÓõÀ GßÚ ?
What are catalytic poisons ?

22. A]m÷hõøÚ GÆÁõÖ ¦÷µõ¨÷£ÚõP ©õØÖÁõ´ ?
How will you convert acetone into propane ?

23. íõº÷©õßPÒ GßÓõÀ GßÚ ? Euõµn® u¸P.
What are Hormones ? Give example.

24. ¤ßÁ¸® ÂøÚÁ›ø\°À EÒÍ A ©ØÖ® B ÷\º©[PøÍU PshÔP.
Sn/HCl 3 CH COCl
CH3 CH2 NO 2 → A →B
Identify the compounds A and B in the following sequence of reactions.

Sn/HCl 3 CH COCl
CH3 CH2 NO 2 → A →B

£Sv & III / PART - III
SÔ¨¦ : H÷uÝ® BÖ ÂÚõUPÐUS Âøh¯ÎUPÄ®. ÂÚõ Gs 33 &US Pmhõ¯©õP
Âøh¯ÎUPÄ®. 6x3=18

Note : Answer any six questions. Question No. 33 is Compulsory.

25. L¤èåº m÷µõ¨è öuõS¨¦ •øÓø¯ £ØÔ SÔ¨¦ ÁøµP.
Write a note on Fischer tropsch synthesis.

26. »õ¢uÚõ´kPÒ, BUiÚõ´kPÒ & CÁØÔØS Cøh÷¯¯õÚ ÷ÁÖ£õkPÒ
H÷uÝ® ‰ßÔøÚ GÊxP.

Write any three differences between Lanthanoids and Actinoids.

A [ v¸¨¦P / Turn over

6622 8

27. [Pt(NO2)(H2O)(NH3)2]Br GßÓ AønÂÀ ¤ßÁ¸ÁÚÁØøÓU PshÔP.

(A) ø©¯ E÷»õP Aq/A¯Û
(B) AønÄ Gs
(C) ø©¯ E÷»õP A¯Û°ß BU]á÷ÚØÓ Gs
For the complex, [Pt(NO2)(H2O)(NH3)2]Br identify the following.
(a) Central metal atom/ion
(b) Co-ordination number

(c) Oxidation number of central metal ion

28. öíÀ®÷íõmì ªß Cµmøh AkUS £ØÔ SÔ¨¦ ÁøµP.
Write a note on Helmholtz electrical double layer.

29. ªßÚõØ £SzuÀ £ØÔ¯ L£õµ÷h ÂvPøÍ GÊxP.
State Faraday’s Laws of Electrolysis.

30. _Âmhº A¯Û JßÔß Aø©¨ø£z u¸P.
Give the structure of a Zwitter ion.

31. GzvÀ A]m÷hmøh GÆÁõÖ GzvÀ A]m÷hõ A]m÷hmhõP ©õØÖÁõ´ ?
How will you convert Ethylacetate into Ethylaceto acetate ?

32. EnÄ £uÚ¨ ö£õ¸mPÒ GߣøÁ ¯õøÁ ? C¸ GkzxUPõmkPÒ u¸P.
What are food preservatives ? Give two examples.

33. J¸ •uÀ ÁøP ÂøÚ¯õÚx 99% {øÓ Eøh¯ ÷uøÁ¯õÚ ÷|µ©õÚx AÆÂøÚ
90% {øÓÁøh¯z ÷uøÁ¯õÚ ÷|µzøu¨ ÷£õ» Cµsk ©h[S GÚU PõmkP.

Show that in case of first order reaction the time required for the completion of
99% is twice the time required for the completion of 90% of the reaction.

A

9 6622

£Sv & IV/PART - IV

SÔ¨¦ : AøÚzx ÂÚõUPÐUS® Âøh¯ÎUPÄ®. 5x5=25

Note : Answer all the questions.

34. (A) ¦»zy´ø©¯õUPÀ •øÓ°øÚ J¸ GkzxUPõmkhß ÂÁ›UPÄ®.

AÀ»x

(B) (i) ¤ßÁ¸® ÷\º©[PÎÀ íõ»áßPÎß BU]á÷ÚØÓ {ø»ø¯U
Psk¤iUPÄ®.

(1) OF2 (2) I2O4

(ii) ¤ßÁ¸® ÂøÚPøÍ §ºzv ö\´P.

(1) P4+NaOH+H2O →

(2) XeF6+H2O →

(3) Cu+Ahº H2SO4 →

(a) Explain zone refining process with an example.

OR

(b) (i) Find the oxidation state of Halogen in the following compounds.

(1) OF2 (2) I2O4

(ii) Complete the following reactions.

(1) P4+NaOH+H2O →

(2) XeF6+H2O →

(3) Cu+conc. H2SO4 →

A [ v¸¨¦P / Turn over

6622 10

35. (A) (i) øh÷£õ÷µÛß ÁiÁø©¨ø£ ÂÁ›UPÄ®.
(ii) GzvÀ ÷£õ÷µm ÷\õuøÚø¯ GÊxP.
AÀ»x
(B) E÷»õPU Põº÷£õøÚÀPÎÀ Põn¨£k® ¤øn¨¤ß ußø©PøÍ
ÂÁ›UPÄ®.
(a) (i) Describe the structure of Diborane.
(ii) Write ethylborate test.
OR

(b) Describe the nature of bonding in metallic carbonyls.

36. (A) åõmQ ©ØÖ® L¤µõ[PÀ SøÓ£õkPøÍ ÂÍUSP.
AÀ»x
(B) (i) §ä¯ ÂøÚUS Cµsk Euõµn[PÒ u¸P.
(ii) ÷uõÀ £uÛkuÀ ©ØÖ® Cµ¨£º öuõȼÀ TÌ©[PÒ GÆÁõÖ
£¯ß£kQÓx ?
(a) Explain Schottky and Frenkel defects.
OR
(b) (i) Give two examples for zero order reaction.
(ii) How colloids are used in tanning of leather and in Rubber
industry ?

37. (A) BìÁõÀm&}ºzuÀ ÂvUPõÚ \©ß£õmøh Á¸ÂUPÄ®.
AÀ»x
(B) (i) AÛ½ß, ¨ŸhÀ Qµõ¨m ÂøÚUS Em£kÁvÀø». Hß ?
(ii) ø|»õß-2-ø|»õß-6 GÆÁõÖ u¯õ›UP¨£kQÓx ?
(a) Derive an expression for Ostwald’s Dilution Law.
OR
(b) (i) Why aniline does not undergo Friedel Craft’s reaction ?

(ii) How nylon-2-nylon-6 is prepared ?

A

11 6622

38. (A) (i) ö£ß\õÀiøíi¼¸¢x ©õ»øPm £aø\ GÆÁõÖ u¯õ›UP¨£kQÓx ?
(ii) ÷uõº¨ ø|møµÀ SÖUP ÂøÚø¯¨ £ØÔ ]Ö SÔ¨¦ GÊxP.
AÀ»x
(B) C6H6O GßÓ Áõ´¨£õmøh Eøh¯ ÷\º©® (A) |k{ø» FeCl3 &Ehß Fuõ
{Ózøuz u¸QÓx. ÷\º©® (A) A®÷©õÛ¯õÄhß ÂøÚ¦›¢x (B) GßÓ
÷\º©zøu²®, ÷©¾® Zn &yÐhß ÂøÚ¦›¢x (C) GßÓ ÷\º©zøu²®
u¸QÓx. A, B, C ÷\º©[PøÍ PshÔ¢x ÂøÚPøÍ GÊxP.
(a) (i) How Malachitegreen is prepared from Benzaldehyde ?

(ii) Write short note on Thorpe nitrile Condensation reaction.
OR
(b) Compound (A) of molecular formula C6H6O gives purple colouration with
neutral FeCl3. Compound (A) reacts with ammonia to give Compound (B)
and it also reacts with Zn dust to give Compound (C). Identify the Compounds
A, B and C and write down the equations.

-o0o-

A [ v¸¨¦P / Turn over