TN 12th Question Paper 2024 Chemistry

TN PUBLIC EXAM

QUESTION
PAPER
2024

No. of Printed Pages : 11
7422
£vÄ Gs
A Register Number

!7422Chemistry!
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 |õßS ©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

7422 2

1. TØÖ : ÷©õ÷Úõ QÎÛU P¢uP® Gߣx ÷©õ÷ÚõQÎÛU £iP ÁøPUS
J¸ Euõµn®.
Põµn® : ÷©õ÷ÚõQÎÛU £iP Aø©¨¤ØS a ≠ b ≠ c ÷©¾® α=γ=908,
β ≠ 908.

(A) TØÖ \› BÚõÀ Põµn® uÁÖ.
(B) TØÖ ©ØÖ® Põµn® Cµsk® \›, ÷©¾® Põµn©õÚx TØÔØPõÚ
\›¯õÚ ÂÍUP©õS®.
(C) TØÖ ©ØÖ® Põµn® Cµsk® uÁÖ.
(D) TØÖ ©ØÖ® Põµn® Cµsk® \› BÚõÀ Põµn©õÚx TØÔØPõÚ
\›¯õÚ ÂÍUP©À».
Assertion : Monoclinic sulphur is an example of monoclinic crystal system.
Reason : For a monoclinic system, a ≠ b ≠ c and α=γ=908, β ≠ 908.
(a) Assertion is true but Reason is false.
(b) Both Assertion and Reason are true and Reason is the correct explanation of Assertion.
(c) Both Assertion and Reason are false.
(d) Both Assertion and Reason are true, but Reason is not the correct explanation of
Assertion.

2. K3[Al(C2O4)3] GßÓ AønÄa ÷\º©zvß IUPAC ö£¯º :

(A) ö£õmhõ]¯® m›ì BU\÷»m÷hõ A¾ª÷Úm (III)
(B) ö£õmhõ]¯® møµ BU\÷»m÷hõ A¾ªÛ¯® (III)
(C) ö£õmhõ]¯® møµ BU\÷»m÷hõ A¾ª÷Úm (III)
(D) ö£õmhõ]¯® møµ BU\÷»m÷hõ A¾ª÷Úm (II)
IUPAC name of the complex K3[Al(C2O4)3] is :
(a) Potassium trisoxalato aluminate (III)
(b) Potassium trioxalato aluminium (III)
(c) Potassium trioxalato aluminate (III)
(d) Potassium trioxalato aluminate (II)

A

3 7422

3. ¤ßÁ¸ÁÚÁØÖÒ Á¼ø©¯õÚ Aª»® Gx ?

(A) HBr (B) HI (C) HCl (D) HF

Which of the following is the strongest acid among all ?

(a) HBr (b) HI (c) HCl (d) HF

4. ¤ßÁ¸ÁÚÁØÖÒ sp2 CÚUP»¨¦ CÀ»õux Gx ?

(A) ¦À»Ÿß (B) QµõLø£m

(C) E»º £ÛUPmi (D) QµõL¥ß

Which of the following is not sp2 hybridised ?

(a) Fullerene (b) Graphite

(c) Dry ice (d) Graphene

5. RNA &ÂÀ Põn¨£k® ¤›ªiß Põµ[PÒ :

(A) ø\m÷hõ]ß ©ØÖ® øu¯ªß

(B) ø\m÷hõ]ß ©ØÖ® AiøÚß

(C) ø\m÷hõ]ß ©ØÖ® ²µõ]À

(D) ø\m÷hõ]ß ©ØÖ® SÁõøÚß

The pyrimidine bases present in RNA are :

(a) Cytosine and Thiamine

(b) Cytosine and Adenine

(c) Cytosine and Uracil

(d) Cytosine and Guanine

A [ v¸¨¦P / Turn over

7422 4

6. Bì¤›ß Gߣx :
(A) S÷Íõ÷µõ ö£ß\õ°U Aª»®
(B) A]møhÀ \õ¼]¼U Aª»®
(C) B¢zµÛ¼U Aª»®
(D) ö£ß\õ°À \õ¼]¼U Aª»®
Aspirin is :
(a) chlorobenzoic acid
(b) acetyl salicylic acid
(c) anthranilic acid
(d) benzoyl salicylic acid

7. Aª» FhPzvÀ ö£õmhõ]¯® ö£º©õ[P÷Úm BÚx BU\õ¼U Aª»zøu
__________ BP BU]á÷ÚØÓ® Aøh¯a ö\´QÓx.

(A) A]m÷hm (B) BU\÷»m
(C) A]miU Aª»® (D) Põº£ß øh BUøék
In acid medium, potassium permanganate oxidizes oxalic acid to :
(a) acetate (b) oxalate
(c) acetic acid (d) carbon dioxide

8. AÛ½ÚõÚx A]miU Aª» }›¼²hß ÂøÚ¨£mk öPõkUS® ÂøÍö£õ¸Ò :
(A) p-Aª÷Úõ A]m÷hõ¥÷Úõß
(B) o&Aª÷Úõ A]m÷hõ¥÷Úõß
(C) A]mhÛø»k
(D) m-Aª÷Úõ A]m÷hõ¥÷Úõß
When aniline reacts with acetic anhydride, the product formed is :
(a) p-aminoacetophenone
(b) o-aminoacetophenone
(c) acetanilide
(d) m-aminoacetophenone

A

5 7422

9. RÌUPshÁØÖÒ Gx }µõØ £S¨£øh¯õx ?
(A) ÷\õi¯® S÷Íõøµk (B) ÷\õi¯® £õº÷©m
(C) A®÷©õÛ¯® £õº÷©m (D) A®÷©õÛ¯® ø|m÷µm
Among the following which will not be hydrolysed ?
(a) Sodium Chloride (b) Sodium Formate
(c) Ammonium Formate (d) Ammonium Nitrate

10. ¤ßÁ¸® ªßP»[PÎÀ GøÁ •ußø© ªßP»[PÍõS® ?
(i) ö»U»õg÷\ ªßP»® (ii) {UPÀ&Põmª¯® ªßP»®
(iii) ö»m ÷\ª¨¦U P»® (iv) ö©ºS› ªßP»®
(A) (iii) ©ØÖ® (iv) (B) (i) ©ØÖ® (iv)
(C) (ii) ©ØÖ® (iii) (D) (i) ©ØÖ® (iii)
Among the following cells primary cells are :
(i) Leclanche cell (ii) Nickel-Cadmium cell
(iii) Lead Storage Battery (iv) Mercury cell
(a) (iii) and (iv) (b) (i) and (iv)
(c) (ii) and (iii) (d) (i) and (iii)

11. A]m÷hõÛ¼¸¢x \¯÷Úõøím›ß E¸ÁõS® ÂøÚ ¤ßÁ¸ÁÚÁØÖÒ
GuØS \õßÓõP EÒÍx ?
(A) G»Umµõß PÁº ÷\º¨¦ ÂøÚ
(B) P¸PÁº £v½mk ÂøÚ
(C) P¸PÁº ÷\º¨¦ ÂøÚ
(D) G»Umµõß PÁº £v½mk ÂøÚ
The formation of cyanohydrin from acetone is an example of :
(a) electrophilic addition
(b) nucleophilic substitution
(c) nucleophilic addition
(d) electrophilic substitution

A [ v¸¨¦P / Turn over

7422 6

12. J¸ ÂøÚ°ß ÂøÚ÷ÁP ©õÔ¼°ß ©v¨¦ 5.8×10−2 s−1 GÛÀ AÆÂøÚ°ß
ÂøÚÁøP :
(A) Cµshõ® ÁøP (B) •uÀ ÁøP
(C) ‰ßÓõ® ÁøP (D) §ä⯠ÁøP
The rate constant of a reaction is 5.8×10−2 s−1. The order of the reaction is :

(a) Second order (b) First order

(c) Third order (d) Zero order

13. ªßÚõØ£SzuÀ •øÓ°À Põ¨£øµz y´ø©¯õUSÁvÀ ¤ßÁ¸ÁÚÁØÖÒ Gx
÷|ºªßÁõ¯õP ö\¯À£kQÓx ?
(A) Põº£ß usk (B) y¯ Põ¨£º
(C) ¤ÍõmiÚ® ªßÁõ´ (D) y´ø©¯ØÓ Põ¨£º
In the electrolytic refining of copper, which one of the following is used as anode ?

(a) Carbon rod (b) Pure copper

(c) Platinum electrode (d) Impure copper

14. C¸®¦ ÂøÚ÷ÁP©õØÔ°ß ö\¯ÀvÓøÚ AvP›US® ÷\º©® :
(A) CH3COOH (B) H2S (C) Al2O3 (D) As2O3
Activity of iron catalyst is increased by the __________ compound.

(a) CH3COOH (b) H2S (c) Al2O3 (d) As2O3

15. K›øn¯ BÀPíõÀPÎß BU]á÷ÚØÓzøu BÀiøík E¸ÁõS®
{ø»°÷»÷¯ {øÓÄ ö\´¯¨ £¯ß£k® BU]á÷ÚØÔ¯õÚx :
(A) Na2Cr2O7 (B) KMnO4 (C) K2Cr2O7 (D) PCC
The oxidising agent used to stop the oxidation of primary alcohol at the aldehyde stage is :

(a) Na2Cr 2O7 (b) KMnO4 (c) K2Cr 2O 7 (d) PCC

A

7 7422

£Sv & II / PART - II
SÔ¨¦ : H÷uÝ® BÖ ÂÚõU-PÐ
- US Âøh-¯Î
- U-PÄ
- ®. ÂÚõ Gs 24 &US Pm-hõ-¯©õP
Âøh-¯-ÎU-P-Ä®. 6x2=12

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

16. PõØÔÀ»õa `ǼÀ ÁÖzuÀ GßÓõÀ GßÚ ?
What is Calcination ?

17. ÷£õ›U Aª»zøu GÆÁõÖ ÷£õµõß ø|møµk BP ©õØÖÁõ´ ?
How will you convert boric acid to boron nitride ?

18. P¢uP Aª»® J¸ }º}US® Põµo. J¸ GkzxUPõmkhß {ÖÄP.
Sulphuric acid is a dehydrating agent. Justify with an example.

19. ö£õx A¯Û ÂøÍøÁ J¸ GkzxUPõmkhß ÂÍUSP.
Explain common ion effect with an example.

20. Fe3+ A¯ÛPÒ vmh {ø»ø©PÎÀ ¦÷µõø©øh ¦÷µõªÚõP BU]á÷ÚØÓ®
Aøh¯a ö\´²©õ ?
öPõkUP¨£mhx : EᑻFe 3+ᎂFe 2+= 0.771 V

EᑻBr ᎂBr−= 1.09 V
2

Can Fe3+ oxidise bromide to bromine under Standard Conditions ?

Given : EᑻFe 3+ᎂFe 2+= 0.771 V

ᑻ
EBr ᎂBr−
= 1.09 V
2

21. ÷PõÀL¨ ÂøÚø¯ GÊxP.
Write Kolbe’s reaction.

A [ v¸¨¦P / Turn over

7422 8

22. RÌUPshÁØÔß Aø©¨ø£ GÊxP.
α−D-SÐU÷Põø£µ÷Úõì ©ØÖ®

β−D-SÐU÷Põø£µ÷Úõì

Write the structure of the following :
α−D-glucopyranose and
β−D-glucopyranose

23. Gvº E°›PÒ GßÓõÀ GßÚ ?
What are antibiotics ?

24. ÂøÚÁøP GßÓõÀ GßÚ ?
What is an order of a reaction ?

£Sv & III / PART - III
SÔ¨¦ : H÷u-Ý® BÖ ÂÚõU-PÐ
- US Âøh-¯Î
- U-PÄ
- ®. ÂÚõ Gs 33 &US Pm-hõ-¯©
- õP
6x3=18
Âøh-¯-ÎU-P-Ä®.
Note : Answer any six questions. Question No. 33 is compulsory.

25. Ｏzvß £¯ßPøÍz u¸P.
Give the uses of helium.

26. Fe3+ AÀ»x Fe2+ Gx AvP {ø»¨¦z ußø© Eøh¯x ? Hß ?

Which is more stable Fe3+ or Fe2+ ? Why ?

27. A¾ªÛ¯©õÚx PÚ\xµ ö|¸[Q¨ ö£õv¢u Aø©¨¤À £iP©õQÓx. Auß
E÷»õP Bµ® 125 pm. A»SU Tmiß Âή¦ }ÍzøuU PnUQkP.
Aluminium crystallizes in a cubic close packed structure. Its metallic radius is 125 pm.
Calculate the edge length of unit cell.

A

9 7422

28. AºïÛ¯ì \©ß£õmiøÚ GÊv AvÀ Ch®ö£ØÖÒÍÁØøÓ ÂÍUSP.
Write Arrhenius equation and explain the terms involved.

29. C¯Ø¦Ó¨£µ¨¦ PÁºuÀ ©ØÖ® ÷Áv¨¦Ó¨£µ¨¦ PÁºuÀ BQ¯ÁØÔß «x
öÁ¨£{ø» ©ØÖ® AÊzuzvß ÂøÍÂøÚ ÂÍUSP.
Explain the effect of temperature and pressure on physisorption and chemisorption.

30. ÷|õöÁ|PÀ ÂøÚø¯ ÂÍUSP.
Explain Knoevenagal reaction.

31. K›øn¯ A«ß, Põº£ß øh \Àø£khß ¦›²® ÂøÚø¯ GÊxP.
Write the reaction of primary amine with Carbon disulphide (CS2).

32. ö£¨øhk ¤øn¨¦ £ØÔ ]ÖSÔ¨¦ ÁøµP.
Write a short note on peptide bond.

33. [Co(CN)2 Cl2]Cl GßÓ AønÂÀ ¤ßÁ¸ÁÚÁØøÓU PshÔP.

(i) IUPAC ö£¯º

(ii) ø©¯ E÷»õP A¯Û

(iii) AønÄ Gs
In the complex, [Co(CN)2 Cl2]Cl, identify the following.

(i) IUPAC name

(ii) Central metal ion

(iii) Co-ordination number

A [ v¸¨¦P / Turn over

7422 10

£Sv & IV / PART - IV
SÔ¨¦ : AøÚz-x ÂÚõU-P-ÐU-S® Âøh-¯-ÎU-P-Ä®. 5x5=25

Note : Answer all the questions.

34. (A) (i) PÛ©®, uõx BQ¯ÁØÔØQøh÷¯¯õÚ ÷ÁÖ£õkPÒ ¯õøÁ ?
(ii) Põ¨£º ¤›zöukzuÀ ö\¯À•øÓ°À ]¼UPõÂß £[S GßÚ ?
AÀ»x
(B) (i) ÷£õ›U Aª»zvß £¯ßPøÍ GÊxP.
(ii) ]¼U÷PmkPÒ GßÓõÀ GßÚ ?
(a) (i) What are the differences between minerals and ores ?

(ii) What is the role of silica in the extraction of copper ?

OR

(b) (i) Give the uses of Boric acid.

(ii) What are silicates ?

35. (A) »õ¢uÚõ´k SÖUP® GßÓõÀ GßÚ ? Auß ÂøÍÄPÒ ¯õøÁ ?
AÀ»x
(B) (i) Cµmøh E¨¦PÒ ©ØÖ® AønÄa ÷\º©[PÒ £ØÔ ]ÖSÔ¨¦ GÊxP.
(ii) ©¸zxÁz xøÓ°À £¯ß£k® Kº AønÄa ÷\º©® ©ØÖ® E°›¯À
•UQ¯zxÁ® Áõ´¢u AønÄa ÷\º©® BQ¯ÁØÖUS Euõµn® u¸P.
(a) What is Lanthanoid Contraction and what are the consequences of Lanthanoid
Contraction ?

OR

(b) (i) Write a short notes on double salts and co-ordination compounds.

(ii) Give an example of Coordination Compound used in medicine and a biologically
important Coordination Compound.

A

11 7422

36. (A) Gί PÚa\xµ £iP Aø©¨¤ß ö£õvÄz vÓøÚ PnUQkP.
AÀ»x
(B) (i) A → ÂøÍö£õ¸Ò GßÓ §ä¯ ÁøP ÂøÚUPõÚ öuõøP¨£kzu¨&
£mh ÷ÁP Âv°øÚ Á¸ÂUPÄ®.
(ii) uõ[PÀ vÓß & Áøµ¯ÖUPÄ®.
(a) Calculate the percentage efficiency of packing in case of simple cubic crystal.
OR
(b) (i) Derive the integrated rate law for a Zero order reaction, A → product.
(ii) Define buffer Index.

37. (A) (i) PõÀÁõÛU ªßP» SÔ±k •øÓø¯¨ £ØÔ ÂÍUSP.
(ii) ÷PõÀk Gs & Áøµ¯ÖUPÄ®.
AÀ»x
(B) ¿Põì ÷\õuøÚ £ØÔ SÔ¨ö£ÊxP.
(a) (i) Explain about Galvanic cell notation.
(ii) Define gold number.
OR
(b) Write notes on Lucas Test.

38. (A) (i) Q›UÚõºk ÂøÚUPõµo°¼¸¢x A]miU Aª»® GÆÁõÖ
u¯õ›UP¨£kQÓx ?
(ii) ©US® £»£iPÒ GßÓõÀ GßÚ ? GkzxUPõmk u¸P.
AÀ»x
(B) C2H4O GßÓ Áõ´£õk öPõsh P›©a ÷\º©® (A) BÚx Zn-Hg/Ahº HCl
Ehß ÂøÚ¦›¢x ÷\º©® (B) &ø¯z u¸QÓx. ÷\º©® (B) BÚx HNO3 Ehß
ÂøÚ¦›¢x ÷\º©® (C) (•ußø© ÂøÍö£õ¸Ò) ©ØÖ® ÷\º©® (D) &ø¯z
u¸QÓx. ÷©¾® ÷\º©® (C) BÚx Ahº HCl Ehß ÂøÚ¦›¢x ÷\º©® (E)
(\ø©¯À ÂÛPº) ©ØÖ® øímµõU]»ªøÚz u¸QÓx. A, B, C, D ©ØÖ® E
BQ¯ÁØøÓU PshÔ¢x uS¢u ÂøÚPøÍz u¸P.
(a) (i) How acetic acid is prepared from Grignard reagent ?
(ii) What are bio-degradable polymers ? Give an example.
OR
(b) An organic Compound (A) of molecular formula C2H4O reacts with Zn-Hg/Conc. HCl
to give Compound (B) which reacts with HNO3 forming Compound (C) (as major product)
and Compound (D). Compound (C) reacts with conc. HCl to give Compound (E)
(Table vinegar) and hydroxylamine. Identify A, B, C, D and E with suitable reactions.

-oOo-

A [ v¸¨¦P / Turn over

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