TN 12th Question Paper 2026 Chemistry

FOR TN 12TH EXAM PREPARATION

TN 12th 2026
Question Paper ·
Chemistry
EXAM YEAR TYPE SUBJECT

TN 12th 2026 Question Paper Chemistry

Notes · Sample Papers · Previous Year Papers · Mock Tests

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No. of Printed Pages : 11
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!9022Chemistry!
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PART - III
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( / Tamil & English Version )
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Põ» AÍÄ : 3.00 ©o ÷|µ® ] [ ö©õzu ©v¨ö£sPÒ : 70

Time Allowed : 3.00 Hours ] [Maximum Marks : 70

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Instructions : (1) a
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®.
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Note : Draw diagrams and write equations wherever necessary.

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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

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9022 2

1. ¤ßÁ¸ÁÚÁØÖÒ GzuÛ© ¤›zöukzu¼À ªß ÷Áv •øÓ £¯ß£kQÓx ?
(A) ÷\õi¯® (B) C¸®¦ (C) ]ÀÁº (D) ö»m
Electrochemical process is used in the extraction of which of the following element ?

(a) Sodium (b) Iron (c) Silver (d) Lead

2. +1 BU]á÷ÚØÓ {ø»°ß {ø»¨¦zußø© AvP›US® Á›ø\ __________ .
(A) (B)
In < Tl < Ga < Al Al < Ga < In < Tl

(C) (D)
Ga < In < Al < Tl Tl < In < Ga < Al

The stability of +1 oxidation state increases in the sequence __________.

(a) In < Tl < Ga < Al (b) Al < Ga < In < Tl

(c) Ga < In < Al < Tl (d) Tl < In < Ga < Al

3. XeF &ß •Êø©¯õÚ }µõØ £S¨¤ÚõÀ E¸ÁõÁx :
6

(A) XeO(B)3
(C) XeOF
4
XeO
2
(D) XeO F
2 2

XeF on complete hydrolysis produces :
6

(a) XeO (b) XeOF (c) XeO (d) XeO F
3 4 2 2 2

4. ¤ßÁ¸ÁÚÁØÖÒ ö£õ¸zu©ØÓ TØÖ Gx ?
3+ 2+
(A) ©ØÖ®
Co &À \© GsoUøP°»õÚ uÛzu Cøn¯õPõu
Fe

G»UmµõßPÒ EÒÍÚ.
(B) CxÁøµ AÔ¯¨£mh AøÚzx E÷»õP[PÎÀ, AøÓ öÁ¨£{ø»°À
öÁÒίõÚx AvP ªßPhzx® vÓøÚ¨ ö£ØÖÒÍx.
(C) J¸ £v½høh¢u E÷»õPU P»øÁ E¸ÁõP, Pøµ¨£õß ©ØÖ® Pøµö£õ¸Ò
BQ¯ÁØÔß Aq Bµ[PÐUQøh÷¯¯õÚ ÷ÁÖ£õk Âh SøÓÁõP 15%

C¸UP ÷Ásk®.
(D) J¸ E÷»õPzvß vmh ªß•øÚ ªßÚÊzu ©v¨£õÚx AvP GvºUSÔ (E8)

©v¨ø£¨ ö£ØÔ¸¨¤ß, A¢u E÷»õP©õÚx J¸ Á¼ø©¯õÚ
BU]á÷ÚØÔ.
Which of the following statements is incorrect ?

3+ 2+
(a) Co and Fe have same number of unpaired electrons.

(b) Of all the known elements, Silver has the highest electrical conductivity at room

temperature.

(c) To form a substitute alloy, the difference between the atomic radii of solvent and solute

should be less than 15%.

(d) If the standard electrode potential (E8) of a metal is large and negative, the metal is a

powerful oxidising agent.

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5. [ Pt (Py) (NH ) (Br) (Cl) ]
3
GßÓ AønÄa ÷\º©zvØS \õzv¯©õÚ ÁiÁ ©õØÔ¯[PÒ
GzuøÚ ?
(A) 0 (B) 3 (C) 15 (D) 4

How many geometrical isomers are possible for [ Pt (Py) (NH ) (Br) (Cl) ] ?

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(a) 0 (b) 3 (c) 15 (d) 4

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SøÓQÓx.
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Põµn® :
öÁÎ÷¯ÖQßÓÚ.
(A) TØÖ \› BÚõÀ Põµn® uÁÖ.
(B) TØÖ ©ØÖ® Põµn® Cµsk® \›, ÷©¾® Põµn©õÚx TØÔØS \›¯õÚ
ÂÍUP©õS®.
(C) TØÖ ©ØÖ® Põµn® Cµsk® uÁÖ.
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(D) TØÖ ©ØÖ® Põµn® Cµsk® \›, BÚõÀ Põµn©õÚx TØÔØS \›¯õÚ
ÂÍUP©À».
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Assertion : Due to Frenkel defect, density of the crystalline solid decreases.

Reason :

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In Frenkel defect, cation and anion leaves the crystal.

(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.

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J¸ Pv›¯UPz uÛ©zvß Aøµ ÁõÌ Põ»® |õmPÒ GÛÀ, 140 560
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|õmPÐUS¨

m .co ¤ßÚº, uÛ©©õÚx ¤ßÁ¸©õÖ SøÓ¢v¸US®.
1 g

s e m
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g a
l(D)  1 

g la (A)  g
 8
(B)  g
 2 
(C)  g
 16  a  g
 4 

a The half life period of a radioactive element is 140 days. After 560 days 1 g of element will be

reduced to :

 1  1   1   1 
(a)  g (b)  g (c)  g (d)  g
 8  2   16   4 

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9022 4

8. K
a
©ØÖ® ªß£S롧 ö\ÔÄPÎß Ai¨£øh°À ÷\õi¯® £õº÷©m Pøµ\¼ß
pH Gߣx :

1 1
(A) pH = 7 − pK
a
− logC
2 2

1 1
(B) pH = 7 −
2
pK
a
+
2
logC

1 1
(C) pH = 7 +
2
pK
a
+
2
logC

1 1
(D) pH = 7 + pK
a
− logC
2 2

The pH of sodium formate solution in terms of K and the concentration of the electrolyte
a

is :

1 1
(a) pH = 7 − pK − logC
a
2 2

1 1
(b) pH = 7 − pK + logC
a
2 2

1 1
(c) pH = 7 + pK + logC
a
2 2

1 1
(d) pH = 7 + pK − logC
a
2 2

9. öÁ¨£{ø»°À
298 K 0.5 mol dm ö\ÔÄøh¯
−3
Pøµ\¼ß {¯© PhzxzvÓß
AgNO
3

©v¨¦ 5.76×10
−3
S cm
−1
GÛÀ, Auß ÷©õ»õº PhzxzvÓß ©v¨¦ :
2 2
(A) 0.086 S cm mol
−1
(B) 2.88 S cm mol
−1

2 2
(C) 28.8 S cm mol
−1
(D) 11.52 S cm mol
−1

−3
The molar conductivity of a 0.5 mol dm solution of AgNO with specific conductance
3

−3 −1
5.76×10 S cm at 298 K is :

2 −1 2 −1
(a) 0.086 S cm mol (b) 2.88 S cm mol

2 −1 2 −1
(c) 28.8 S cm mol (d) 11.52 S cm mol

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10. J¸ A¯Û°ß ÃÌ£iÁõS® vÓß ¤ßÁ¸® £s¦PÎÀ Gøua \õº¢x
Aø©¢xÒÍx ?
(A) A¯Û°ß ªß_ø©¯ÍøÁ ©mk®.
(B) A¯Û°ß ªß_ø©¯ÍÄ ©ØÖ® ªß_ø©°ß SÔ.
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(C) A¯Û°ß ªß_ø©°ß SÔø¯ ©mk®.
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(D) A¯Û°ß E¸ÁÍøÁ ©mk®.
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On which of the following properties does the coagulating power of an ion depend ?

s l a
(a)

l a
The magnitude of the charge on the ion alone.

g ag
(b)

(c)
a
Both magnitude and sign of the charge on the ion.

The sign of charge on the ion alone.

(d) Size of the ion alone.

11. ¦µ¨£ß& &BÀ }µØÓ 2 ©ØÖ® Ahº ZnCl
2
HCl Ehß ÂøÚ¦›¢x u¸Áx __________.

(A) &S÷Íõ÷µõ ¦µ¨÷£ß
1

(B) GzvÀ S÷Íõøµk
m
(C) &S÷Íõ÷µõ& &ö©zvÀ ¦µ¨÷£ß
2 2

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(D) &S÷Íõ÷µõ ¦µ¨÷£ß
2
s e
Propan-2-ol on reaction with anhydrous ZnCl
g la and concentrated HCl gives __________.

a
2

(a) 1-chloropropane

(b) Ethyl chloride

(c) 2-chloro-2-methyl propane

(d) 2-chloropropane

(i) O 3 NH 3

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12. CH =CH
2 2
→ X → Y


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(ii) Zn/H O
2

omGߣx
c. (A)
‘Y’ :

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l as
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ag
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2 2
(i) O
3
→ X → Y

(ii) Zn/H O
NH
3

2

‘Y’ is :

(a) Hexamethylene tetramine (b) Formaldehyde

(c) Oxime (d) Diacetone ammonia

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9022 6

Sn/HCl NaNO /HCl H O
2 2
13. C H NO → A → B → C
6 5 2
273 K 283 K

‘C’ Gߣx :
(A) C H CHO
6 5
(B) C H OH
6 5

(C) C H NH
6 5 2
(D) C H CH OH
6 5 2

Sn/HCl NaNO /HCl H O
2 2
C H NO → A → B → C
6 5 2
273 K 283 K

‘C’ is :

(a) C H CHO (b) C H OH
6 5 6 5

(c) C H NH (d) C H CH OH
6 5 2 6 5 2

14. α-D(+) SÐU÷Põì ©ØÖ® β-D(+) SÐU÷Põì BQ¯Ú :
(A) CÚßæ÷¯õ©ºPÒ (B) G¤©ºPÒ
(C) Á\ ©õØÔ¯[PÒ (D) B÷Úõ©ºPÒ
α-D(+) Glucose and β-D(+) Glucose are :

(a) Enantiomers (b) Epimers

(c) Conformational isomers (d) Anomers

15. Enº÷Áؤ ø©¯zxhß ¤øn¢x Auß C¯À£õÚ ö\¯À£õmøhz ukUS®
©¸¢xPÒ GßÓøÇUP¨£kQßÓÚ.
__________

(A) ö|õvPÒ (B) GvºÂøÚ³UQ
(C) ‰»UTÖ C»USPÒ (D) •ußø© C¯UQ
Drugs that bind to the receptor site and inhibit its natural function are called __________.

(a) enzymes (b) antagonists

(c) molecular targets (d) agonists

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£Sv & II / PART - II

SÔ¨¦ : GøÁ÷¯Ý® BÖ ÂÚõUPÐUS Âøh¯ÎUPÄ®. ÂÚõ Gs 24 &US
Pmhõ¯©õP Âøh¯ÎUPÄ®. 6x2=12

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

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PõØÔÀ»õa `ǼÀ ÁÖzuÀ GßÓõÀ GßÚ ? Kº GkzxUPõmk u¸P.
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What is calcination ? Give an example.

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17.

(A) ag
l
BrF
a
¤ßÁ¸® ÷\º©[PÎÀ Põn¨£k® CÚUP»¨£õuø»U SÔ¨¤kP.
(B) BrF
ag
5 3

Mention the type of hybridisation in the following compounds.

(a) BrF (b) BrF
5 3

18. Cµmøh E¨¦PÒ ©ØÖ® AønÄa ÷\º©[PÐUS Cøh÷¯¯õÚ ÷ÁÖ£õkPøÍz
u¸P.
Give the differences between double salts and coordination compounds.

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19. J¸ ÂøÚ°À ÂøÚ£k ö£õ¸mPÒ ©ØÖ® &I ö£õÖzx ÂøÚÁøP¯õÚx X, Y

m.co Z

•øÓ÷¯ ©ØÖ® §ä⯮ GÛÀ, AÆÂøÚUPõÚ ÷ÁP Âvø¯ GÊxP.
1/2, 3/2
s e
g la
Write the rate law for the reaction in which the order with respect to the reactants X, Y and

Z are 1/2, 3/2 and zero respectively. a
20. C[U ©ØÖ® QµõLø£m TÌ©[PÒ u¯õ›US® •øÓø¯¨ £ØÔ ÂÍUSP.
Explain the method by which colloidal solutions of ink and graphite are prepared.

21. ¥Úõø» GÆÁõÖ ¥ÚõÀ¨u½ÚõP ©õØÖÁõ´ ?
How will you convert phenol to phenolphthalein ?

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Aª» öuõSvUPõÚ ÷\õuøÚPøÍz u¸P. .co
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22.

em l as
Give the tests for carboxylic acid group.

las ag
ag ¦øµz uk¨£õßPÒ GÆÁõÖ Q¸ª|õ]ÛPÎhª¸¢x ÷ÁÖ£kQßÓÚ
23. ?
How do antiseptics differ from disinfectants ?

24. 1.5×10
−3
M Ba(OH)
2
Pøµ\¼ß pH ©v¨ø£ PnUQkP.
−3
Calculate the pH of 1.5×10 M solution of Ba(OH) .
2

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9022 8

£Sv & III / PART - III

SÔ¨¦ : GøÁ÷¯Ý® 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. Áõ² {ø»ø©z y´ø©¯õUP¾UPõÚ Ai¨£øhz ÷uøÁPøÍz u¸P.
Give the basic requirement for vapour phase refining.

4+ 2+
26. Ce ©ØÖ® Co &ß G»Umµõß Aø©¨¦PøÍz u¸P.
4+ 2+
Give the electronic configuration of Ce and Co .

27. ¤ßÁ¸® ÷\º©[PÒ GÆÁøP¯õÚ ©õØÔ¯zøu öÁΨ£kzxQßÓÚ ?
(A) ©ØÖ®
[Co (NH )
3 4
Br ] Cl
2
[Co (NH )
3 4
ClBr] Br

2+ 2+
(B) ©ØÖ®
[Co (NH )
3 5
NO ]
2
[Co (NH )
3 5
ONO]

(C) ©ØÖ®
[Pt (NH ) ] [PdCl ]
3 4 4
[Pd (NH ) ][PtCl ]
3 4 4

Which type of isomerism is exhibited by the following compounds ?

(a) [Co (NH ) Br ] Cl and [Co (NH ) ClBr] Br
3 4 2 3 4

2+ 2+
(b) [Co (NH ) NO ] and [Co (NH ) ONO]
3 5 2 3 5

(c) [Pt (NH ) ] [PdCl ] and [Pd (NH ) ][Pt Cl ]
3 4 4 3 4 4

28. ö£õ¸Òø©¯ PÚa\xµ Aø©¨¤À ö£õvÄz vÓß \uÃuzvøÚU PnUQkP.
Calculate the percentage efficiency of packing in case of body centered cubic crystal.

29. J¸ •uÀ ÁøP ÂøÚ°À, t
99.9%
=10 t
½
Gߣøu {¹¤.
Prove that in case of first order reaction t =10 t
99.9% ½

30. ÂøÚ÷ÁP ©õØÔPÎß ]Ó¨¤¯À¦PÒ H÷uÝ® ‰ßøÓ £mi¯¼kP.
List any three characteristics of catalysts.

31. íõº÷©õßPÒ GßÓõÀ GßÚ ? GkzxUPõmkPÒ u¸P.
What are harmones ? Give examples.

32. öh›½ß GÆÁõÖ u¯õ›UP¨£kQÓx ?
How is terylene prepared ?

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33. C
2
GßÓ ‰»UTÖ Áõ´£õk Eøh¯ P›©a ÷\º©®
H N
7
BÚx ø|mµì (A)

Aª»zxhß ÂøÚ¦›¢x {ø»¨¦z ußø©¯ØÓ ÷\º©® &ø¯z u¸QÓx. (B)

GÚ÷Á ÷\º©® BÚx ÷\º©® BP ©õØÓ® AøhQßÓx. ÷\º©®
(B) (C)

(C)ö£m÷µõ¼¯® £v¼¯õP¨ £¯ß£kzu¨£kQßÓx. ÷\º©[PÒ ©ØÖ® (A), (B)

&I PshÔP.
(C)
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An organic compound (A) with molecular formula C H N reacts with nitrous acid to form
.co
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2 7

compound (B) which is unstable. Hence compound (B) gets converted to compound (C).

e m
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Compound (C) is used as a substitute for petrol. Identify compounds (A), (B) and (C).

l as
l as ag
ag £Sv & IV / PART - IV

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

Note : Answer all the questions.

34. (A) (i) ¦Â Dº¨¦ •øÓ £ØÔ ]Ö SÔ¨¦ GÊxP.
(ii) P¢uP Aª»® J¸ }º }US® Põµo GߣuøÚ uS¢u GkzxUPõmk
PÐhß ÂÍUSP.
AÀ»x
m
(B) (i) ]¼U÷PõßPÎß H÷uÝ® ‰ßÖ £¯ßPøÍz u¸P.
m .co
(ii)

s e
L¤èåº&m÷µõ¨è öuõS¨¦ •øÓ £ØÔ ]Ö SÔ¨¦ GÊxP.
(a) (i)

g la
Write a short note on Gravity Separation process.

(ii) a
Sulphuric acid is a dehydrating agent. Explain with suitable examples.

OR

(b) (i) Give any three uses of silicones.

(ii) Write a short note on Fischer Tropsch synthesis.

35. (A) »õ¢uÚõ´k SÖUP® GßÓõÀ GßÚ ? Auß Põµn[PÒ ©ØÖ® ÂøÍÄPÒ
¯õøÁ ?
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[Ni(CO) ]
4
BÚx uÍa\xµ [Ni(CN) ]

s
4
e 2−
m
s e ÁiÁzøu²® Hß ö£ØÔ¸UQÓx Gߣøu CønvÓ ¤øn¨¦U
g l a
g la öPõÒøP°ß Ai¨£øh°À ÂÍUSP. a
a (a) What is Lanthanoid contraction ? What are the causes and effects of Lanthanoid

contraction ?

OR

(b) Based on Valence bond theory, explain why the geometry of [Ni(CO) ] is tetrahedral
4

2−
and [Ni(CN) ] is squareplanar.
4

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9022 10

36. (A) (i) £iP ÁiÁ•øh¯ vs©[PøÍ £iP ÁiÁ©ØÓ vs©[Pμ¸¢x
÷ÁÖ£kzxP.
(ii) ÂøÚ÷ÁPzøu wº©õÛUS® £i GߣuøÚ Euõµnzxhß ÂÍUSP.
AÀ»x
(B) BìÁõÀm }ºzuÀ ÂvUPõÚ \©ß£õmøhz u¸Â.
(a) (i) Differentiate crystalline solids and amorphous solids.

(ii) Explain the rate determining step with an example.

OR

(b) Derive an expression for Ostwald’s dilution law.

37. (A) (i) P»ÂøÚPÎß öÁ¨£ C¯UP¯À £ØÔ ÂÍUSP.
(ii) PõÀÁõÛU ªßP»ßPÎÀ Hß E¨¦ £õ»® £¯ß£kzu¨£kQÓx ?
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(ii) dil H SO /H O
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