TN 11th Question Paper 2026 Chemistry

FOR TN 11TH EXAM PREPARATION

TN 11th 2026
Question Paper ·
Chemistry
EXAM YEAR TYPE SUBJECT

TN 11th 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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9122

!9122IstYearChemistry! £vÄ Gs
Register Number

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PART - III
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: 3.00 ] [ ö©õzu ©v¨ö£sPÒ : 70

Time Allowed : 3.00 Hours ] [Maximum Marks : 70

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Instructions : (1)
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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.

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a (ii) öPõkUP¨£mkÒÍ |õßS ©õØÖ ÂøhPÎÀ ªPÄ® Hئøh¯
Âøhø¯z ÷uº¢öukzxU 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 the corresponding answer.

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1. Qµõ® Gøh²ÒÍ }ºzxΰÀ EÒÍ }º ‰»UTÖPÎß GsoUøP :
0.018

20 26 22 23
(A) (B)
6.022×10 (C) (D)
6.022×10 9.9×10 6.022×10

The number of water molecules in a drop of water weighing 0.018 g is :

20 26 22 23
(a) 6.022×10 (b) 6.022×10 (c) 9.9×10 (d) 6.022×10

2. TØÖ &ß {Ó©õø»¯õÚx, øímµáÛß {Ó©õø»°øÚ Jzv¸US®
: He
+

GßÖ Gvº¨£õºUP¨£kQÓx.
Põµn® &® J¸ G»UmµõøÚU öPõsh J¸ Aø©¨£õS®.
: He
+

(A) TØÖ \› BÚõÀ Põµn® uÁÖ.
(B) TØÖ ©ØÖ® Põµn® Cµsk® \›¯õÚx, ÷©¾® Põµn©õÚx, TØÔØS
\›¯õÚ ÂÍUP©õS®.
(C) TØÖ ©ØÖ® Põµn® Cµsk® uÁÖ.
(D) TØÖ ©ØÖ® Põµn® Cµsk® \›¯õÚx, BÚõÀ Põµn©õÚx, TØÔØS
\›¯õÚ ÂÍUP©À».
+
Assertion : The spectrum of He is expected to be similar to that of Hydrogen.

+
Reason : He is also one electron system.

(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.

3. RÌUPsh £s¦PÎÀ Gx AÍÂhzuUP ©v¨¦ AÀ» ©ØÖ® J¸ J¨¥mk
£s£õP Áøµ¯ÖUP¨£kQÓx ?
(A) Aq Bµ® (B) G»Umµõß PÁºußø©
(C) A¯Û¯õUS® BØÓÀ (D) G»Umµõß |õmh®
Which of the following property is not a measurable quantity and defined as a relative

property ?

(a) Atomic radius (b) Electronegativity

(c) Ionisation energy (d) Electron affinity

4. öuõS¨¦ Áõ² Gߣx :
(A) CO+H (B) 2
H O
2 (g)
(C) CO+N
2
(D) CO+H O
2

Syn gas is :

(a) CO+H (b) H O (c) CO+N (d) CO+H O
2 2 (g) 2 2

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5. ¤ßÁ¸® TØÖPÎÀ uÁÓõÚx Gx ?
2+
(A) Mg A¯ÛPÒ ATP ‰»UTÖPÐhß AønÄPøÍ EshõUSQßÓÚ.
2+
(B) ^µõÚ Cu¯z xi¨ø£ £µõ©›¨£vÀ Ca A¯ÛPÎß £[PΨ¦ HxªÀø».
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2+
(C) Ca A¯ÛPÒ Cµzu® EøÓu¼À •UQ¯©õÚøÁ.
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(D) uõÁµ[PÎß S÷Íõ÷µõ¤À
m .co Mg
2+
A¯ÛPÒ •UQ¯©õÚøÁ.
s e m
s e l a
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Which of the following statement is false ?

(a) Mg
g l a
2+
ions form a complex with ATP.

(b)
a
Ca
2+
ions are not important in maintaining the regular beating of the heart.

2+
(c) Ca ions are important in blood clotting.

2+
(d) Mg ions are important in the Chlorophyll of the plants.

6. Áõ² ©õÔ¼ R Cß ©v¨¦ :

om
3
(A) 8.3 J mol
−1
K
−1
(B) 0.082 dm atm

. c
(C) 8 erg mol
−1
K
−1

e
(D) m
0.987 cal mol
−1 −1
K

The value of the gas constant R is :
las
(a) 8.3 J mol
−1
K
−1
ag (b) 0.082 dm
3
atm

−1 −1 −1 −1
(c) 8 erg mol K (d) 0.987 cal mol K

7. G›uÀ öÁ¨£® G¨ö£õÊx® :
(A) §ä⯮

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(B) ÷|ºSÔ ©v¨¦ Eøh¯x
om ÷|ºSÔ AÀ»x GvºSÔ ©v¨¦ Eøh¯x
c. (C) e m
e m (D) GvºSÔ ©v¨¦ Eøh¯x l as
las ag
ag Heat of combustion is always :

(a) Zero

(b) Positive

(c) Either positive or negative

(d) Negative

[ v¸¨¦P / Turn over

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8. Sκ¢u }›À Põº£ß øhBUøék Áõ²Âß PøµvÓøÚ __________ ‰»®
AvP›UP»õ®.
(A) PÚ AÍÂøÚ AvP›¨£uß (B) AÊzuzøu AvP›¨£uß
(C) öÁ¨£{ø» AvP›¨£uß (D) AÊzuzøu SøÓ¨£uß
Solubility of carbon dioxide gas in cold water can be increased by __________.

(a) increase in volume (b) increase in pressure

(c) increase in temperature (d) decrease in pressure

9. Pøµ¨£õß ©ØÖ® Pøµö£õ¸Îß ÷©õÀ ¤ßÚ®, X
A
©ØÖ® X
B
Eøh¯ J¸
C¸ TÖ Pøµ\¾US öµÍÀm Âva \©ß£õk :

o o
P
Pøµ\À − PPøµ¨£õß P
Pøµ¨£õß − PPøµ\À
(A) = X (B) = X
A A
o o
P P
Pøµ¨£õß Pøµ¨£õß

o
P o
Pøµ\À − PPøµ¨£õß P
Pøµ¨£õß − PPøµ\À
= X
(C) o
B
(D) = X
B
P o
Pøµ¨£õß P
Pøµ¨£õß

In a binary solution with X and X as the mole fraction for solvent and solute, the Raoult’s
A B

Law expression is :

o o
Psolution − P P − Psolution
solvent solvent
= X = X
(a) o
A (b) o
A
P P
solvent solvent

o o
Psolution − P P − Psolution
solvent solvent
= X = X
(c) o
B (d) o
B
P P
solvent solvent

10. ClF
3
Cß ÁiÁ® :
(A) ‘T’ ÁiÁ® (B) •U÷Põn \©uÍ®
(C) |õß•Q (D) ¤µªk ÁiÁ®
Shape of ClF is :
3

(a) ‘T’ Shaped (b) Planar triangular

(c) Tetrahedral (d) Pyramidal

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11. BÀPõøh±ßPÎß ö£õxÁõÚ Áõ´£õk :
(A) C
n
H
2n−2
(B) C
n
H
2n
(C) C
n
H
n−2
(D) C
n
H
2n−1

The general formula for Alkadienes is :

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(a) C H (b) C H (c) C H (d) C H
n 2n−2 n 2n n n−2 n 2n−1

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RÌPsh ÷\º©[PÎÀ Gx AvP Aª»z ußø© Eøh¯x ?
s e m
s em l a
a ag
(A) øhS÷Íõ÷µõ A]miU Aª»®
g l
a
(B) S÷Íõ÷µõ A]miU Aª»®
(C) møµS÷Íõ÷µõ A]miU Aª»®
(D) A]miU Aª»®
Among the following compounds which is more acidic ?

(a) Dichloro acetic acid

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(b) Chloroacetic acid

(c) Trichloro acetic acid

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(d) Acetic acid

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13. C H Br + 2Na
E»º Duº
→ C H
a+ 2NaBr
2 5 4 10

÷©ØPskÒÍ ÂøÚ ¤ßÁ¸® GÆÂøÚUPõÚ GkzxUPõmhõS® ?
(A) BÀhõÀ SÖUP ÂøÚ (B) Ÿ©º&j©ß ÂøÚ
(C) íõL¨ö©ß ÂøÚ (D) Eºmì ÂøÚ

m
dry ether
C H Br + 2Na →C H +2NaBr

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2 5
 4 10

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The above reaction is an example of which of the following ?

e m
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(a) Aldol condensation reaction (b) Reimer-Tiemann reaction

l as
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14. C F Cl
2 2 4
&ß ö£¯º :
(A) L¨Ÿ¯õß& 114 (B) L¨Ÿ¯õß& 112 (C) L¨Ÿ¯õß& 115 (D) L¨Ÿ¯õß& 113

The name of C F Cl is :
2 2 4

(a) Freon-114 (b) Freon-112 (c) Freon-115 (d) Freon-113

[ v¸¨¦P / Turn over

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15. Cµzuzv¾ÒÍ ï÷©õS÷Íõ¤ß __________ Ehß Põº£õUê ï÷©õS÷Íõ¤øÚ
E¸ÁõUSQÓx.
(A) Põº£ß ÷©õÚõUø\k (B) Põº£ß øhBUø\k
(C) Põº£õÛU Aª»® (D) Põº£ß öhmµõS÷Íõøµk
Haemoglobin of the blood forms carboxy haemoglobin with __________.

(a) Carbon monoxide (b) Carbon dioxide

(c) Carbonic acid (d) Carbon tetrachloride

£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.

16. BU]á÷ÚØÓ®, JkUP® ÷ÁÖ£kzxP.
Distinguish between oxidation and reduction.

17. ö£Í¼ uºUøPz uzxÁzvøÚU TÖP.
State Pauli’s Exclusion Principle.

18. Bºz÷uõ ©ØÖ® £õµõ øímµáß £ØÔ ]Ö SÔ¨¦ GÊxP.
Write a short note on Ortho and Para Hydrogen.

19. £õ°¼ß Âv°øÚ TÖP.
State Boyle’s law.

20. ußÛaø\ ö\¯À•øÓPÐUPõÚ {£¢uøÚPøÍz u¸P.
Give the conditions for the spontaneity of a process.

21. ½&\õm¼¯º uzxÁzvøÚ TÖP.
State Le-Chatelier principle.

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22. J¸ \P¤øn¨¤ß J÷µ ©õv›¯õÚ ¤ÍÄ ©ØÖ® öÁÆ÷ÁÖ ©õv›¯õÚ ¤ÍÄ
GßÓõÀ GßÚ ?
What is Homolytic and Heterolytic cleavage of a Covalent Bond ?

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23. ©s ©õ_£õmk ‰»[PøÍ SÔ¨¤kP.
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Mention the sources of soil pollution.

s e m
s em l a
24.

g a
¤ßÁ¸® l÷\º©[PÎÀ EÒÍ ÂøÚö\¯À öuõSv°øÚ PshÔP. ag
a
(A) A]mhõÀiøík (B) BU\õ¼U Aª»®
(C) øhö©zvÀ Duº (D) ö©zvÀ A«ß
Identify the functional group in the following compounds.

(a) acetaldehyde (b) oxalic acid

(c) dimethyl ether (d) methylamine

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£Sv & III / PART - III

SÔ¨¦ : GøÁ÷¯Ý® BÖ ÂÚõUPÐUS Âøh¯ÎUPÄ®. ÂÚõ Gs
s em 33 &US
Pmhõ¯©õP Âøh¯ÎUPÄ®.
g la 6x3=18

Note : Answer any six questions.
a
Question No. 33 is compulsory.

25. |ÃÚ BÁºzuÚ Âvø¯ Áøµ¯ÖUPÄ®.
Define Modern Periodic Law.

26. |À¼¯À¦ Áõ²a \©ß£õmiøÚ Á¸ÂUPÄ®.
m
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Derive Ideal gas equation.

om
c. PÚ e m
e 27.
m }›ß £¯ßPøÍz u¸P.
l as
las Give the uses of Heavy Water.
ag
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28. ÷©õ»õÀ EøÓ {ø»z uõÌÄ ©õÔ¼ GßÓõÀ GßÚ ? Cx Pøµö£õ¸Îß
ußø©ø¯ ö£õ¸zx Aø©QÓuõ ?
What is molal freezing point depression constant ? Does it depend on nature of the

solute ?

[ v¸¨¦P / Turn over

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29. ]U©õ (σ) - ¤øn¨¦ ©ØÖ® ø£ (π) - ¤øn¨¦ £ØÔ ]Ö SÔ¨¦ GÊxP.
Write a short note on sigma(σ)-bond and pi(π)-bond.

30. ¤ßÁ¸® ÷\º©[PÐUS IUPAC ö£¯›øÚ GÊxP.
(A) CH −CH=CH−C
3
≡ CH

(B)

(C) CH −O−CH
3 3

Write the IUPAC name for the following compounds.

(a) CH −CH=CH−C ≡ CH
3

(b)

(c) CH −O−CH
3 3

31. RÌPsh ÷\º©[PøÍ u¯õ›US® •øÓ°øÚ ÂÁ›UPÄ®.
(i)¥Úõ¼¼¸¢x ö£ß^ß
¤ŸhÀ-&Qµõ¨m ÂøÚ ‰»©õP öhõ¾±ß
(ii)

Describe the preparation of following compounds.

(i) Benzene from phenol

(ii) Toluene by Friedel–Craft’s reaction

32. ¤ßÁ¸® ÂøÚPøÍ {øÓÄ ö\´P.
THF
(i) C H Cl + Mg →
6 5

∆
(ii) CCl + H O →
4 2

Complete the following reactions.

THF
(i) C H Cl + Mg →
6 5

∆
(ii) CCl + H O →
4 2

33. 10 ÷©õÀ A®÷©õÛ¯õøÁ E¸ÁõUP GzuøÚ ÷©õÀ øímµáß ÷uøÁ ?
How many moles of hydrogen are required to produce 10 moles of ammonia ?

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£Sv & IV / PART - IV

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

Note : Answer all the questions.

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34. (A) (i)
o m
¤ßÁ¸® ÷\º©[PÎß ÷©õ»õº {øÓø¯U PnUQkP.
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e
(A)

s
³›¯õ [CO(NH ) ]

l a
ag
2 2

g a
l A]m÷hõß
(B) [CH COCH ]

a
3 3

(ii) 3p ©ØÖ®
x
4d 2
x −y
2 G»UmµõßPÐUS n ©ØÖ® ©v¨¦PÒ ¯õøÁ ?
l

AÀ»x
(B) (i) •uÀ A¯Û¯õUS® BØÓø» Âh Cµshõ® A¯Û¯õUS® BØÓÀ
G¨ö£õÊx® AvP® GÝ® TØÔøÚ GÆÁõÖ ÂÍUSÁõ´ ?
(ii) A¯Û¯õUS® BØÓ¼ß BÁºzuÚ öuõhº¤øÚ ÂÍUSP.
m
(a) (i)

m
Calculate the molar mass of the following compounds.
.co
s e
la
(A) Urea [CO(NH ) ]
2 2

(B) Acetone [CH COCH ]
3
ag 3

(ii) What are the n and l values for 3p and 4d 2 2 electrons ?
x x −y

OR

(b) (i) How would you explain the fact that the second ionisation potential is always

higher than the first ionisation potential ?

(ii) Explain the periodic trend of ionisation potential.

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35.

s e
s em g l a
la a
AÀ»x
ag (B) Q¨ì Pmi»õ BØÓ¼ß ]Ó¨¤¯À¦PøÍ SÔ¨¤kP.
(a) Compare the properties of Lithium with other elements of the group.

OR

(b) Mention the characteristics of Gibbs Free Energy.

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36. (A) (i) K
p
©ØÖ® K
c
&US Cøh÷¯¯õÚ öuõhº¦ ¯õx ?

(ii) \©{ø» ÂøÚ°ß vø\°øÚ GÆÁõÖ Po¨£õ´ Gߣøu ÂÍUSP.

AÀ»x

(B) (i) \ÆÅk £µÁÀ AÊzu® Áøµ¯ÖUPÄ®.

(ii) \ÆÅk £µÁÀ AÊzu® Hß ¤Ó öuõøP\õº £s¦PøÍU Põmi¾®
•UQ¯zxÁ® Eøh¯x ?
(a) (i) What is the relation between K and K ?
p c

(ii) Explain how will you predict the direction of an equilibrium reaction.

OR

(b) (i) Define osmotic pressure.

(ii) Why osmotic pressure is significant over other colligative properties ?

37. (A) COCß ‰»UTÖ Bº¤mhõÀ (MO) Áøµ£hzøu ÁøµP, ÷©¾® Auß
¤øn¨¦z uµzøuU PnUQkP.

AÀ»x

(B) (i) £iÁ›ø\ £ØÔ SÔ¨ö£ÊxP.

(ii) P¸UPÁº ö£õ¸Ò ©ØÖ® G»Umµõß PÁº ö£õ¸Ò GßÓõÀ GßÚ ?
JÆöÁõßÔØS® uS¢u Euõµn[PÒ u¸P.
(a) Draw Molecular Orbital (MO) diagram of CO and calculate its Bond Order.

OR

(b) (i) Write a note on homologous series.

(ii) What are electrophiles and nucleophiles ? Give suitable examples for each.

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38. (A) ]Ö SÔ¨¦ GÊxP.
ÂÀ¼¯®\ß Duº öuõS¨¦
(i)

\õsm÷©¯º ÂøÚ
(ii)

L¤ßöPÀìjß ÂøÚ
(iii)

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AÀ»x
m
(B)
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PõØÔÀ»õ öÁ¨£‰mhÀ (ø£÷µõ¼]ì) GßÓõÀ GßÚ ?
(i)

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(ii)

s
A
e
©ØÖ® &ø¯ PshÔP. ÂøÚPÐUPõÚ \©ß£kzu¨£mh
B
l a
l a
\©ß£õmiøÚ GÊxP.
g ag
a

(a) Write a short note on :

(i) Williamson Ether synthesis

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(ii) Sandmeyer reaction

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(iii) Finkelstein reaction

s e
OR

(b) (i) What is Pyrolysis ?

g la
(ii) Identify A and B.
a
Write balanced equation for the reactions.

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- o O o -

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s e g l a
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