Tamil Nadu 12th Std Model Question Paper Chemistry

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No. of Printed Pages : 11
3272 (NS)
£vÄ Gs
!3272NSChemistry! Register Number

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¢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.

[ v¸¨¦P / Turn over

3272 (NS) 2

1. EÀ¨-µ-ø©m uõ-xøÁ öÁÒ-Ï-¯U-PÀ-¼À C¸¢x ¤›z-öu-kU-S® •øÓ :
(A) ªß-Põ¢-u¨ ¤›¨¦ •øÓ (B) E¸U-S-uÀ
(C) PõØ-ÔÀ-»õa `Ç-¼À ÁÖz-uÀ (D) ÁÖz-uÀ
Wolframite ore is separated from tinstone by the process of :
(a) Electromagnetic separation (b) Smelting
(c) Calcination (d) Roasting

2. ö£õ-¸z-xP :
(1) ¦-Ñ›ß (i) {Ó-•ÒÍ E÷»õP A¯-Û-PøÍ Ps-h-Ô-uÀ
(2) ÷£õ-µõUì (ii) Á¼-ø© ªS BU-ê-á-÷ÚØÓ Pµ-o
(3) A¾-ª-Û-¯® (iii) \õÀ÷PõáßPÒ G›- © - ø »a \õ®- £ - ¼ À
Põ-n¨-£-k-Á-x
(4) \À-£º (iv) Av-P AÍ-ÂÀ Põ-n¨-£-k® uÛ-©®
(A) (1)-(iii), (2)-(ii), (3)-(iv), (4)-(i)
(B) (1)-(ii), (2)-(i), (3)-(iv), (4)-(iii)
(C) (1)-(iv), (2)-(iii), (3)-(ii), (4)-(i)
(D) (1)-(ii), (2)-(iv), (3)-(i), (4)-(iii)
Match the following :
(1) Fluorine (i) Identification of coloured metal ions
(2) Borax (ii) Strong oxidising agent
(3) Aluminium (iii) Chalgogens Present in volcanic ashes
(4) Sulphur (iv) Most abundant element
(a) (1)-(iii), (2)-(ii), (3)-(iv), (4)-(i)
(b) (1)-(ii), (2)-(i), (3)-(iv), (4)-(iii)
(c) (1)-(iv), (2)-(iii), (3)-(ii), (4)-(i)
(d) (1)-(ii), (2)-(iv), (3)-(i), (4)-(iii)

3. øí¨-÷£õ-ø|m-µì Aª-»z-vß Áõ´¨-£õ-k :
(A) HOONO (B) H2N2O2 (C) HNO2 (D) HNO4
Formula for hyponitrous acid :
(a) HOONO (b) H2N2O2 (c) HNO2 (d) HNO4

4. +3 BU-ê-á-÷ÚØÓ {ø»-ø¯ ©m-k® öPõs-kÒÍ Cøh-{-ø»z uÛ©® :
(A) Ni (B) Mn (C) Cr (D) Sc
The transition element which has only +3 oxidation state is :
(a) Ni (b) Mn (c) Cr (d) Sc

3 3272 (NS)

5. bcc A»-S Tm-iÀ Põ-n¨-£-k® öÁØ-Ô-hz-vß \uÃu® :
(A) 26% (B) 48% (C) 23% (D) 32%
The vacant space in bcc lattice unit cell is :
(a) 26% (b) 48% (c) 23% (d) 32%

6. J¸ ÂøÚ°À ÂøÚ- £ - k - ö £õ- ¸ - Î ß ö\Ô- Á õ- Ú x Auß xÁUP AÍÂÀ
\›£õ-v-¯õP SøÓ-Á-uØ-Sz ÷uøÁ¨-£-k® Põ-»® GÚ¨-£-k-Áx :
(A) Aøµ-ÁõÌ Põ-»® (B) •uÀ ÂøÚ- Á-øP
(C) §ä¯ ÂøÚ- ÁøP (D) Cµs-hõ® ÂøÚ ÁøP
Time required for the reactant concentration to reach one half of its initial value is
called :
(a) half life period (b) first order
(c) zero order (d) second order

7. ÷\õ-i-¯® L£õº-÷©m, AÛ-½-Û-¯® S÷Íõ-øµ-k ©Ø-Ö® ö£õm-hõ-]-¯® \¯-øÚk
BQ-¯-ÁØ-Ôß }º-P-øµ-\À-PÒ •øÓ-÷¯ :
(A) Aª-»®, Aª-»®, Aª-»® (B) Aª-»®, Aª-»®, Põ-µ®
(C) Põ-µ®, Aª-»®, Põ-µ® (D) Põ-µ®, |k-{ø», Põ-µ®
The aqueous solutions of sodium formate, anilinium chloride and potassium cyanide
are respectively :
(a) acidic, acidic, acidic (b) acidic, acidic, basic
(c) basic, acidic, basic (d) basic, neutral, basic

8. ©i-P-o-Û-°À Põ-n¨-£-k-Áx :
(A) ö»m ÷\ª¨¦ P»ß
(B) G›-ö£õ-¸Ò ªß-P-»ß
(C) £õ-u-µ\ £m-hß ªß ÷\ª¨¦ P»ß
(D) ¼z-v-¯® A¯-Û ªß ÷\ª¨¦ P»ß
Laptops have :
(a) Lead storage battery
(b) Fuel cell
(c) Mercury button cell
(d) Lithium-ion battery

[ v¸¨¦P / Turn over

3272 (NS) 4

9. ¤ß-Á-¸® ÂøÚ {P-Ç GÆ-ÁÍÄ L£õ-µ÷h ªß-÷Úõm-h® ÷uøÁ¨-£-k® ?
−
MnO 4 → Mn 2+

(A) 7 F (B) 5 F (C) 3 F (D) 1 F
How many Faradays of electricity are required for the following reaction to occur
−
MnO 4 → Mn 2+ ?

(a) 7F (b) 5F (c) 3F (d) 1F

10. 280 K öÁ¨-£-{-ø»-°À, ¥ÚõÀ, Ahº H2SO4 Ehß ÂøÚ-£mk QøhU-S®
•UQ¯ ÂøÍ-ö£õ-¸Ò :
(A) \õ-¼-]-¼U Aª-»®
(B) ¤U-›U Aª-»®
(C) o-¥ÚõÀ \À-÷£õ-ÛU Aª-»®
(D) p-¥ÚõÀ \À-÷£õ-ÛU Aª-»®
The major product obtained when phenol reacts with Con. H2SO4 at 280 K is :
(a) Salicylic acid
(b) Picric acid
(c) o-phenol sulphonic acid
(d) p-phenol sulphonic acid

11. ÂÀ-¼-¯®-\ß öuõ-S¨¦ •øÓ-°À øh ö©z-vÀ Du-øµ E¸-ÁõU-S® ÂøÚ,
J¸ :
(A) G»Um-µõß PÁº £v-½mk ÂøÚ
(B) SN1 ÂøÚ
(C) SN2 ÂøÚ
(D) G»Um-µõß PÁº ö£õ-¸Ò ÷\ºUøP ÂøÚ
Williamson synthesis of preparing dimethyl ether is a/an :
(a) Electrophilic substitution reaction
(b) SN1 reaction
(c) SN2 reaction
(d) Electrophilic addition reaction

5 3272 (NS)

12. TØÖ : p-N,N &øhö©z- v À Aª- ÷ Úõö£ß- \ õÀ- i - ø ík ö£ß- \ õ- ° ß
SÖUP ÂøÚUS Em-£-k-Q-Ó-x.
Põ-µ-n® : BÀ-i-øík (−CHO) öuõ-S-v-¯õ-Úx ö©m-hõ BØ-Ö¨-£-kz-x®
öuõ-S-v-¯õ-S®.
(A) TØÖ, Põ-µ-n® Cµs-k® uÁ-Ö
(B) TØÖ, Põ-µ-n® Cµs-k® \›, ÷©¾® Põ-µ-n® TØ-ÔØ-PõÚ \›-¯õÚ
ÂÍU-P-©õ-S®
(C) TØÖ, Põ-µ-n® Cµs-k® \›, Põ-µ-n® TØ-ÔØ-PõÚ \›-¯õÚ ÂÍU-P-©À-»
(D) TØÖ \› BÚõÀ Põ-µ-n® uÁ-Ö
Assertion : p-N,N-dimethyl aminobenzaldehyde undergoes benzoin
condensation.
Reason : The aldehydic (−CHO) group is meta directing.
(a) Both Assertion and Reason are false.
(b) Both Assertion and Reason are true and Reason is the correct explanation of
Assertion.
(c) Both Assertion and Reason are true but Reason is not the correct explanation of
Assertion.
(d) Assertion is true but Reason is false.

13. ¤ß-Á-¸-Á-Ú-ÁØ-ÖÒ Gx Av-P Põ-µz-uß-ø©-²-øh-¯x ?
(A) 2, 4&øh¦÷µõ-÷©õ AÛ-½ß (B) 2, 4&øhS-÷Íõ-÷µõ AÛ-½ß
(C) 2, 4&øhö©z-vÀ AÛ-½ß (D) 2, 4&øhø|m-÷µõ AÛ-½ß
Which one of the following is most basic ?
(a) 2, 4-dibromo aniline (b) 2, 4-dichloro aniline
(c) 2, 4-dimethyl aniline (d) 2, 4-dinitro aniline

14. DNA &Âß J¸ CøÇ-¯õ-Úx ‘ATGCTTGA’ GÝ® Põµ Á›-ø\ø¯ ö£Ø-ÖÒÍx
GÛÀ Auß {µ¨¦ CøÇ-°ß Põµ Á›ø\ :
(A) TACGRAGT (B) TACGAACT
(C) TCCGAACT (D) TACGTACT
If one strand of the DNA has the sequence ‘ATGCTTGA’, then the sequence of
complementary strand would be :
(a) TACGRAGT (b) TACGAACT
(c) TCCGAACT (d) TACGTACT

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3272 (NS) 6

15. ©¸¢xPÎß uµ©õÚx AÁØÔß __________ Ai¨£øh°À
AÍÂh¨£kQÓx.
(A) iBUê›÷£õì (B) ÷PõÀk Gs
(C) ©¸¢-uõUP Gs (D) \©-{ø» ©õ-Ô-¼
The medicinal value of a drug is measured in terms of its :
(a) Deoxyribose (b) Gold number
(c) Therapeutic index (d) Equilibrium constant

£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. \»-øÁz yÒ GÆ-ÁõÖ u¯õ-›U-P¨-£-k-Q-Óx ?
How is bleaching powder prepared ?

17. RÌU-Põ-q® uÛ-©[-PøÍ d-öuõ-Sv ©Ø-Ö® f&öuõ-Sv GÚ ÁøP¨-£-kz-x-P.
(i) h[ì-hß (ii) ¸z-v-Û-¯®
(iii) ¦÷µõ-ªz-v-¯® (iv) Ißì-j-Û-¯®
Classify the following elements into d-block and f-block elements :
(i) Tungsten (ii) Ruthenium
(iii) Promethium (iv) Einsteinium

18. CrCl3⋅6H2O -GßÓ ‰»U-TÖ Áõ´¨-£õm-i-øÚU öPõsh Aøn-Äa ÷\º-©z-vß
H÷u-Ý® Cµsk }÷µØÓ ©õØ-Ô-¯[-PøÍ GÊ-x-P.
Write any two hydrate isomers of the complex with the molecular formula CrCl3⋅6H2O.

19. ö|¸[Q ö£õ-v¢u ÷PõÍ[-P-Îß Gs-oUøP 6 GÛÀ E¸-Áõ-S® Gs-•Q
©Ø-Ö® |õß-•Q öÁØ-Ô-h[-P-Îß Gs-oU-øP-ø¯U PnU-Q-k-P.
If the no. of close packed sphere is 6, calculate the number of Octahedral voids and
Tetrahedral voids generated.

7 3272 (NS)

20. ¿° Aª-»[-PÒ ©Ø-Ö® Põ-µ[-PÒ Gß-ÓõÀ GßÚ ? JÆ-öÁõß-ÔØ-S® Kº
Gkz-xU-Põmk u¸-P.
What are Lewis acids and bases ? Give an example for each.

21. öÁs- ö n- ° À Põ- n ¨- £ - k ® ¤›- ø P Fh- P ® ©Ø- Ö ® ¤›- ø P {ø»- ø ©ø¯
GÊxP.
Write the dispersed phase and dispersion medium of butter.

22. ÷µõ-\ß •ßm JkUP ÂøÚ-°À £¯ß-£-kz-u¨-£-k® ÂøÚ-÷Á-P ©õØ-Ô-°ß
ö£¯-øµU SÔ¨-¤mk Auß •U-Q-¯z-x-Ázøu Gkz-v-¯®-¦-P.
Name the catalyst used in Rosenmund reduction and state its importance.

23. S÷Íõ-÷µõ-¤U-›ß GÆ-ÁõÖ u¯õ-›U-P¨-£-k-Q-Óx ?
How is chloropicrin prepared ?

24. Du-›ß C−O−C ¤øn¨¦ ÷Põ-n® |õß-•Q ¤øn¨¦ ÷Põ-nz-øu- Âh \ØÖ
Av-P®. Hß ?
Why is C−O−C bond angle in ether slightly greater than the tetrahedral bond
angle ?

£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. S÷µõ-ø©À S÷Íõ-øµk ÷\õ-u-øÚø¯ GÊ-x-P.
Write the Chromyl Chloride Test.

26. [Sc(H2O)6]3+ & {Ó©Ø-Óx & ÂÍU-S-P.
[Sc(H2O)6]3+ is colourless - Explain.

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3272 (NS) 8

27. öís-hº-\ß \©ß-£õmøh Á¸-ÂU-P-Ä®.
Derive Henderson equation.

28. E÷»õ- P [- P Ò GÆ- Á õÖ Gvº- • øÚ £õ- x - P õ¨¦ •øÓ- ø ¯¨ £¯ß- £ - k zv
A›z-u-¼-¼-¸¢x £õ-x-PõU-P¨-£-k-Q-Óx ?
How are metals protected from corrosion by cathodic protection method ?

29. ¤ß-Á-¸® TÌ-©z xPÒ-P-Îß Ái-Á[-PøÍU SÔ¨-¤-k-P.
(i) As2S3
(ii) -}-»-{Ó ÷PõÀk TÌ© Pøµ-\À
(iii) -h[ì-iU Aª-» TÌ© Pøµ-\À
Mention the shapes of the following colloidal particles.
(i) As2S3
(ii) Blue gold sol
(iii) Tungstic acid sol

30. £õº-ªU Aª-»®, hõ»ßì Pµ-oø¯ JkU-S-Q-Óx BÚõÀ A]m-iU Aª-»®
hõ»ßì Pµ-oø¯ JkU-S-Á-vÀø». Põ-µ-n® TÖP.
Formic acid reduces Tollens reagent whereas acetic acid does not reduce. Give reason.

31. ¦÷µõm-j-Ûß Aø©¨-ø£¨ ö£õ-Özx GÆ-ÁõÖ ÁøP¨-£-kz-u¨-£m-kÒÍÚ ?
ÂÍU-S-P.
How are proteins classified based on their structure ? Explain.

32. En-ÄU -Tmk ö£õ-¸m-P-Î-ÚõÀ Es-hõ-S® |ß-ø©-PÒ H÷u-Ý® ‰ß-øÓU
TÖP.
State any three advantages of food additives.

33. A¾-ª-Û-¯z-v-¼-¸¢x uõ-¼-¯® Áøµ, A¯-Û-¯õU-S® Gß-uõÀ¤ SøÓ-Áõ-Úx
ªPU SøÓ¢u AÍ÷Á ©õ-Ö-£-k-Qß-Óx. Hß GßÖ ÂÍU-S-P.
There is only a marginal difference in decrease in ionisation enthalpy from Aluminium
to Thallium - Explain why ?

9 3272 (NS)

£Sv & IV / PART - IV
SÔ¨¦ : AøÚzx ÂÚõUPÐUS® Âøh¯ÎUPÄ®. 5x5=25
Note : Answer all the questions.

34. (A) ¦»z-y´-ø©-¯õU-PÀ •øÓ-°-øÚ ÂÁ-›U-P-Ä®.
AÀ»x
(B) (i) \[- Q - ¼ z öuõ- h - µ õU- P ® {PÌ- Á - u Ø- P õÚ H÷u- Ý ® Cµsk
{£¢uøÚPøÍ GÊ-x-P.
(ii) Ps-nõi £õm-iÀ-P-ÎÀ HF &I ÷\ªUP C¯-»õx. Hß ?
(a) Explain zone refining process.
OR
(b) (i) Write any two conditions for catenation.
(ii) Why HF cannot be stored in glass bottles ?

35. (A) (i) \À- ¤ - ³ - µ ì Aª- » ® ©Ø- Ö ® ©õº- å À Aª- » z- v ß ‰»U- T Ö
Áõ´¨£õm-iøÚ GÊ-v AÁØ-Ôß Ái-Á-ø©¨-¤øÚ Áøµ-P.
(ii) RÌU-Põ-q® Aøn-Äa ÷\º-©z-vß IUPAC ö£¯-›-øÚ GÊ-x-P.
(A) [Ag(NH3)2]+ (B) [Co(NH3)5Cl]2+

AÀ»x
(B) (i) [CoF6]3− GßÓ AønÄ ÷\º-©z-vß Põ¢-u-£s¦ ©Ø-Ö® Põ¢u v¸¨¦
vÓ-øÚU PnU-Q-k-P.
(ii) L¤-µ[-PÀ SøÓ-£õk £ØÔ SÔ¨¦ Áøµ-P.
(a) (i) Write the molecular formula and draw the structure of sulphurous acid
and Marshall’s acid.
(ii) Write the IUPAC name of the following :
(A) [Ag(NH3)2]+ (B) [Co(NH3)5Cl]2+
OR
(b) (i) Calculate the magnetic moment and magnetic property of [CoF6]3−
(ii) Write a note on Frenkel defect.

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3272 (NS) 10

36. (A) A→ÂøÍ-ö£õ-¸Ò GßÓ •uÀ-ÁøP ÂøÚU-PõÚ öuõ-øP¨-£-kz-u¨-£mh
÷ÁP Âv-°-øÚ Á¸-ÂU-P.
AÀ»x
(B) (i) RÌU-Põ-q® ö£õ-¸m-P-Îß pH ©v¨ø£ GÊ-xP.
(A) -Â-Û-Pº (B) -P-k[-Põ-¤
(C) -\-ø©-¯À-÷\õ-hõ (D) -÷\õ¨-¦-}º
(ii) J-¸ ªß-P-hz-xU P»-ÛÀ EÒÍ Cµsk ¤Íõm-i-Ú ªß•øÚ-P-ÐUS
Cøh¨-£mh yµ® 1.5 ö\.«. JÆ-öÁõ¸ ªß-•-øÚ-°ß SÖU-S¨
£µ¨-¦® 4.5 \.ö\.«. GßP. 0.5 N ªß-£S- Î
- U Pøµ-\¾
- US ªß-P»
- z-øu¨
£¯ß-£-kzv Ps-h-Ô-¯¨-£mh ªß-uøh ©v¨¦ 15 K®-PÒ GÛÀ,
Pøµ-\-¼ß {¯-© Phz-xz vÓß ©v¨-ø£U Põs-P.
(a) Derive integrated rate law for a first order reaction A→product.
OR
(b) (i) Write the pH value of the following substances :
(A) Vinegar (B) Black coffee
(C) Baking soda (D) Soapy water
(ii) A conductivity cell has two platinum electrodes separated by a distance of
1.5 cm and the cross sectional area of each electrode is 4.5 sq.cm. Using this
cell, the resistance of 0.5 N electrolytic solution was measured as 15 ohms.
Find the specific conductance of the solution.

37. (A) (i) ÷Áv¨¦Ó¨- £ - µ ¨¦ PÁº- u À ©Ø- Ö ® C¯Ø- ¦ - Ó ¨- £ - µ ¨¦
PÁºu¾UQøh÷¯¯õÚ ÷ÁÖ-£õ-k-P-ÎÀ H÷u-Ý® ‰ß-Ô-øÚz u¸-P.
(ii) Cµ¨-£º Eµ-Þm-hÀ (ÁÀ-P-øÚ-¯õU-PÀ) Gß-ÓõÀ GßÚ ?
AÀ»x
(B) (i) ¥Úõ-¼ß Cøn¨¦ ÂøÚø¯ u¸-P.
(ii) Q›U-Úõºk Pµ-o-ø¯¨ £¯ß-£-kzv RÌU-Põs-£-Ú-ÁØøÓ GÆ-ÁõÖ
u¯õ-›¨-£õ´ ?
(A) -¦-µ¨-£ß&1&BÀ (B) -¦-µ¨-£ß&2&BÀ
(a) (i) Give any three differences between chemisorption and physisorption.
(ii) What is Vulcanization ?
OR
(b) (i) Give the coupling reaction of phenol.
(ii) How will you prepare the following by using Grignard reagent ?
(A) propan-1-ol (B) propan-2-ol

11 3272 (NS)

38. (A) (i) L£õº-©-¼ß Gß-£x ¯õx ? Auß £¯ß ¯õx ?
(ii) QøÍU-÷Põ-ê-iU ¤øn¨¦ Gß-ÓõÀ GßÚ ?
AÀ»x
(B) (i) Põ®-ö£ºU ÂøÚ Gß-ÓõÀ GßÚ ? ÂÍU-S-P.
(ii) A ©Ø-Ö® B &I Ps-h-ÔP.

Na(Hg)/C H OH
2 5
A  → CH3−CH2−NH2
4[H]

Na(Hg)/C H OH
2 5
B  → CH3−NH−CH3
4[H]

(a) (i) What is Formalin ? What is its use ?
(ii) What is glycosidic linkage ?
OR
(b) (i) What is Gomberg reaction ? Explain.
(ii) Identify A and B
Na(Hg)/C H OH
2 5
A  → CH3−CH2−NH2
4[H]

Na(Hg)/C H OH
2 5
B  → CH3−NH−CH3
4[H]

-oOo-

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