1. All questions are compulsory.
2. Question nos. 1 to 8 are very short answer questions and carry 1 mark each.
3. Question nos. 9 to 18 are short answer questions and carry 2 marks each.
4. Question nos. 19 to 27 are also short answer questions and carry 3 marks each.
5. Question nos. 28 to 30 are long answer questions and carry 5 marks each.
6. Use log tables if necessary, use of calculators is not allowed.
1. Explain why p-fluorobenzoic acid is a weaker acid than p-chlorobenzoic acid ?
2. Does the absence of chiral C atom always make a molecule optically active?
3.Out of C6H5CH2Cl & C6H5CHClC6H5, Which is more easily hydrolysed by aq. KOH ?
4. Why AgCl is not soluble in water but soluble in amines?
5. Predict : CCl2 is a nucleophile or electrophile ?
6. Why it is essential to control pH during the reaction of NH3 derivative on aldehydes & ketones .
7. Give one test to distinguish b/n ethylamine from aniline.
8. p-Dichlorobenzene has higher m.p & solubility than those of o- & m- isomers.Discuss
9. Complete the following reaction:
Rh
Cu at 573 K
a. CH3OH + CO
b. (CH3)3COH
10.(i) Write structures of different isomeric amines corresponding to the molecular formula, C4H11N.
(ii) What type of isomerism is exhibited by different pairs of amines?
11. Explain why R – Cl is hydrolysed to R – OH slowly but the reaction is rapid if catalytic amounts of KI are added to the reaction mixture.
12. Suggest a test for distinguishing b/n the following pairs:
a. Aqueous solutions of phenol and benzoic acid . b. Aqueous solutions of formaldehyde and acetaldehyde
13. Explain nitration on aniline.
14. Arrange the following in the order of nucleophilic addition reaction –
Benzaldehyde , p-tolualdehyde , p-nitrobenzaldehyde,acetophenone
1
2
15.Predict the order of reactivity of following compds. in SN & SN reactions: (i)The four isomeric bromo butanes
(ii) C6H5CH2Br,C6H5CH(C6H5)Br,C6H5CH(CH3)Br,C6H5C(CH3)(C6H5)Br
16. Why protonation of phenol is not possible , but that of alcohols is possible ?
17. (i) Why cyclohexanone form cynohydrin in good yield but 2,2,6-trimethylcyclohexanone doe s not explain ?
(ii) Although phenoxide ion has more number of resonating structures than carboxylate ion,Carboxylic acid is a stronger acid than phenol. Why?
18. Compare M.pt. & B.pt. of o-dichloro benzene & p-dichlorobenzene.
0
0
0
19. Give the order of basic strength of 1 , 2 & 3 amine in (a) in aq. Medium (b) in non aq. Medium (c) for aromatic amines
20. Give mechanisms of following reactions: a. Alcohol to ether
b. Alcohol to alkene
21. (i) Write IUPAC name of following compounds :a.
COOH
b. C6H5 - N
N – C6 H5
(ii) Find out R& S configuration of following -
NO2
H2N – OCH3
OH
22. Name the reagents used in the following reaction:
a. Oxidation of a primary alcohol to carboxylic acid b. Oxidation of primary alcohol to an aldehyde .
c. Bromination of phenol to 2,4,6-tribromophenol
d. Benzyl alcohol to benzoic acid .
e. Dehydration of propan-2-ol to propene
f. Butan-2-one to butan-2-ol .
23. How will your bring about the following conversions in not more than two steps?
a. Benzaldehyde to Benzophenone b. Bromobenzene to 1- Phenylethanol
c. Benzoyl chloride to Benzonitrile
24. (i) There are two –NH2 groups in semicarbazide. However, only one is involved in the formation of semicarbazones.
(ii) During the preparation of esters from a carboxylic acid and an alcohol in the presence of an acid catalyst, the water or the
ester should be removed as soon as it is formed.
25. Describe the following:
a. Trans – esterification
b. Cross aldol condensation c. Hofmann bromamide reaction
26. (i) Why are amines less acidic than alcohols of comparable molecular masses?
(ii) Why do primary amines have higher boiling point than tertiary amines?
(iii) Why are aliphatic amines stronger bases than aromatic amines?
27. Draw the structures of major monohalo products:
∆
(i)
-OH + SOCl2
(ii) OH-CH2OH + HCl
∆ , uv light
(iii)
-CH3 + HI
(iv)
+ Br2
(v)
CH3CH2CH2Cl + NaI
acetone ,∆
(vi)
CH3CH2CH=CH2 + HBr
peroxide
28. (a) Describe a method for the identification of primary, secondary and tertiary amines.Also write chemical equations of the reactions involved.
(b) How will you prepare (i) Cinnamaldehyde (ii) Cinnamic acid
29. An organic compound (A) having molecular formula C9H10O forms an orange red precipitate (B) with 2, 4 - DNP reagent. Compound (A) gives a
yellow precipitate (C) when heated in the presence of iodine and NaOH along with a colourless compound (D). (A) does not reduce Tollen’s
reagent or Fehling’s solution nor does it decolorise bromine water. On drastic oxidation of (A) with chromic acid, a corboxylic acid (E) of molecular
formula C7H6O2 is formed. Deduce the structures of the organic compounds (A) to (E).
’
30. .(a) Identify A,B,C,D,E,R & R in the following :dry ether
HOH
(i) C6H11 -Br + Mg
A
B
dry ethet
D2O
(ii) R-Br + Mg
C
CH3CH(D)CH3
Na / ether
Mg
HOH
(iii) (CH3)3 C- C (CH3)3
R-X
D
E
(b) While separating a mixture of ortho and para nitrophenols by steam distillation, name the isomer which will be steam volatile. Give reason.
PRADEEP SHARMA, INSTITUTE OF COMPETITIVE STUDIES, SECTOR – 15 , SONEPAT
CONTACT NUMBER : 0130 – 2232322 , E – mail : pics4iit@gmail.com
log on to- : www.picsinstitute.com
1. All questions are compulsory.
2. Question nos. 1 to 10 are short answer questions and carry 2 marks each.
3. Question nos. 11 to 21 are also short answer questions and carry 3 marks each.
4. Question nos. 22 is long answer question and carry 5 marks .
5. Use log tables if necessary, use of calculators is not allowed.
1. Define (a) Gold number (b) Adsorption isobar with graph .
2. What are gel and what is thixotropy?
3. Define (a) CMC (b) Kraft Temperature .
4.How can blood be purified ? Explain the process.
5. Explain the Delta formation and clotting of blood.
6. A decimolar solutions K4[Fe(CN)6] is 50% dissociated at 300 K .Calculate the osmotic pressure of solutions
7. What current stength in ampere required to deposite 1 g of Cu from soln of CuSO4 in 2 hrs. ( at. mass of Cu =63.5)
n
8. 2 g of a protective collide is added to 5 lt of sol . Find out its gold number.
2+
3+
9. Analysis shows that nickel oxide has formula Ni0.98O1.00. What fractions of the nickel exist as Ni and Ni ions?
10. Give Antifluorite structure with example.
11. An element has d of 19.35 gm/c.c. and length of side of unit cell is 316 pm. The unit cell is b.c.c. How many
atoms of element does 50 gm of element contain ?
12. Define (a) Antiferroelectricity (b) Piezoelectricity
13. How many unit cells are there in a 1.0 g cube shaped ideal crystal of NaCl?
14. Define peptization . What happen when FeCl3 is added to Fe(OH)3.
15.The half life period of a first order reaction is 600 s . What percent of A remain after 30 min.?
16. Derive relation b/n t99.9% and t99%.
17. What are Pseudo first order reaction ? Give example.
18.The activation energy of a reaction is 94.14 kJ mol-1 and the value of rate constant at 313 K is 1.8 x10-1 sec-1.
Calculate frequency factor A.
st
19. The activation energy of a 1 order reaction at 300 K is 60 KJ/mol.In the presence of catalyst the activation energy
lowered to 50 KJ/mol at 300K. How many times the reaction gets change in the presence of catalyst at same
temperature?
20. 2 g of C6H5 COOH dissolved in 25g of benzene shows a depression in freezing point equal to 1.62 K ,
kf 5.15 Kkg mol-1. What is the percentage association of acid if it forms double molecules (dimer) in solution?
21 . (A) Classify the following solutions:
(a) acetone + CH2Cl2 (b) ethyle alcohol + H2O
(B) What is the mole fraction of solute in 2.5 m aq. Solution
22. (i) Why oxygen mixed with helium is used by deep sea divers?
(ii) What care should be taken for intravenous injection ?
iii) Conductivity of 0.00241 M acetic acid is 7.896 x 10-5 S cm-1 .Calculate its molar conductivity and ifΛo for acetic
acid is 390 .5 S cm2 mol-1 , what is its dissociation constant ?
PRADEEP SHARMA, INSTITUTE OF COMPETITIVE STUDIES, SECTOR – 15 , SONEPAT
CONTACT NUMBER : 0130 – 2232322 , E – mail : pics4iit@gmail.com
log on to- : www.picsinstitute.com
1. All questions are compulsory.
2. Question nos. 1 to 8 are very short answer questions and carry 1 mark each.
3. Question nos. 9 to 18 are short answer questions and carry 2 marks each.
4. Question nos. 19 to 27 are also short answer questions and carry 3 marks each.
5. Question nos. 28 to 30 are long answer questions and carry 5 marks each.
6. Use log tables if necessary, use of calculators is not allowed.
1. Sulphur in vapor state exhibits Paramagnetism, why?
2. Although thermodynamically feasible, in practice, Mg metal is not used for the reduction of alumina in the metallurgy of Al why?
3. What is the role of depressant in froth floatation process?
4. What happen when a freshly prepared ferric hydroxide is shaken with ferric chloride solution? Name the process.
2+
5. How does NH3 reacts with a solution of Cu ?
6. Which amongst the following is strongest oxidizing agent - ClO4 , BrO 4 , IO4
7. Why Cu matte is put in silica lined converter ?
8. In the ring test for identification of nitrate ion, what is the formula of the compound responsible for the brown ring formed at the interface of two
liquids?
-2
9. Using valance bond theory, predict the geometry and magnetic behaviour of [NiCl4] .
10.What happens when an acidic solution of the green compound (B) is allowed to stand for some time? Give the equation involved. What is the
type of reaction called?
11. What is lanthanoids contraction? What are the consequences of lanthanoids contraction?
12. (a) How is nitric acid obtained on large scale by Ostwald process?
(b) All the bonds in the molecules of PCl5 are not equal. Why
13. a) Name the catalyst and the promoter used in Habers process for Manufacture of ammonia.
(b) Why is ferric chloride preferred over potassium chloride in case of a cut Leading to bleeding?
0
14. The value of ∆fG for formation of Cr2O3 is -540 kJ/mol. & that of Al2O3 is -827 kJ/mol.Is the reduction of Cr2O3 possible with Al2O3 ?
15. Which out of the following is more covalent & why ? a. CuCl , CuCl2
b. PbCl2 , PbCl4
2+
2+
4+
16. Why are Ni compounds thermodynamically more stable than Pt compounds while Pt compound are relatively more stable than
4+
Ni compounds?
217. Knowing the e gain enthalpy values for O
O &O
O as -141 & 702 kJ/mol ,how can you account for the formation of a large no. of
2oxides having O species & not O ?
18. Why R3P = O exist but R3 N = O does not ?
19. A blakish brown coloured solid A when fused with alkali metal hydroxides in presence of air, produces a dark green coloured compound B, which
on electrolytic oxidation in alkaline medium gives a dark colour purple coloured compound C .Identify A,B,C and write the reactions involved.
20. Give reasons for the following
(i) Only higher members of the group 18 of the periodic table are expected to form compounds.
(ii) SF 6 is used as gaseous electrical insulator
(iii) The electron gain enthalpy value of F2 is less negative than Cl2.
21. Identify complexes with different geometries depending up on type of hybridization mention about colour and magnetic properties.
3+
3(a) [Co(NH3)6]
(b) [Co(CN)6 ]
22. Account for the following observations
(i) among the halogens F2 is the strongest oxidising agent?
(ii) fluorine exhibits only – 1 oxidation state whereas other halogens exhibit higher positive oxidation states also.
(iii) acidity of oxo acid of chlorine is : HOCl < HOClO < HOClO2 < HOClO3
23. (i) Out of H2O & H2S ,which have higher bond angle & why?
(ii) Define inert pair effect along with its cause & consequences ?
24. . Explain the following facts
(a) transition metals act as catalysts.
(b) chromium group elements have the highest melting points in their respective series.
(c) transition metals form coloured complexes.
25. Give the electonic configuration of the 3+
(a) d- orbitals of Ti in [Ti (H2O)6] ion in an octahedral crystal field.
(b) Why is this complex coloured? Explain on the basis of distribution of electrons in the d- orbitals.
3+
(c) How does the colour change on heating [Ti(H2O)6] ion?
26. Outline the principles of refining of metals by the following methods:
(i) Zone refining (ii) Electrolytic refining (iii) Van-Arkel method
27. How does acidified potassium permagnate reacts with (a) iron(II) ions (b) SO2 (c) oxalic acid. Write the ionic eq.
28. (a) In the titration of FeSO4 with KMnO4 in the acidic medium, why is dil H2SO4 used instead of dil HCl?
(b) Give reasons:
(i) Among transition metals, the highest oxidation state is exhibited in oxoanins of a metal.
4+
(ii) Ce is used as an oxidizing agent in volumetric analysis.
(iii) Transition metals form a number of interstitial compounds.
2+
2+
(iv) Zn salts are white while Cu salts are blue.
29. i) Xe has highest polarising power. Why?
ii) Halogens are coloured. Why?
iii) Noble gases are mostly chemically inert. Why?
iv) Nitrogen does not form pentahalide. Why?
v) Bismuth is a strong oxidising agent in pentavalent state. Why?
30. (a).Indicate the steps in the preparation of potassium dichromate from chromite ore.
(b). Account the following
(i)The lowest oxide of transition metal is basic, the highest is amphoteric /acidic
(ii)Transition metals have high enthalpy of atomization
PRADEEP SHARMA, INSTITUTE OF COMPETITIVE STUDIES, SECTOR – 15 , SONEPAT
CONTACT NUMBER : 0130 – 2232322 , E – mail : pics4iit@gmail.com
log on to- : www.picsinstitute.com
1.The electric resistance of a column of 0.05M NaOH soln of diameter 1cm & length 50 cm is 5.55X103 ohm.
Calculate its ٨m
2. Calculate eqm constant for the Rxn –
4Br- + O2 + 4H+
2Br2 +2H2O , E0cell = 0.16V
3. Which type of solids show following (1)both Sckottky & Frankel defect. (2) Ferrimagnetism (3) piezoelectricity (4)
Ferroelectricity
4. Why ZnO looks yellow on heating ?
5. Give electro chemical theory of corrosion?
6. 0.01 molol aqueous solution of K3[Fe(CN)6] freezes at –0.062oC. What is the apparent percentage of dissociation (kf
water =1.86 )
2+
3+
7. Analysis shows that nickel oxide has formula Ni0.98O1.00. What fractions of the nickel exist as Ni and Ni ions?
8. Why we add salt to the snow on the roads?
9.The half life period of a first order reaction is 600 s . What percent of A remain after 30 min.?
10. The activation energy of a 1st order reaction at 300 K is 60 KJ/mol. In the presence of catalyst the activation energy
lowered to 50 KJ/mol at 300K. How many times the reaction gets change in the presence of catalyst at same
temperature?
11. Conductivity of 0.00241 M acetic acid is 7.896 x 10-5 S cm-1 . Calculate its molar conductivity and ifΛo for acetic acid
is 390 .5 S cm2 mol-1 , what is its dissociation constant ?
4
+2
+3
12. Of the d species, Cr is strongly reducing while Mn is strongly oxidizing. Explain ?
13. Write a short note on Lanthanide contraction. Also give consequences ?
14. What is misch metal ?
15. Name two transition element showing only one oxidation state ?
o
16. Give 2 structure of DNA.
17. Define – (a) Mutarotatio (b) Zwitter ion (c) gene (d) codon
18. Prepare Nylon – 6 from cyclohexane.
19. What are the monomers of –
(a) PMMA (b) Buna – N (c) PAN (d) natureal rubber (e) Nylon - 6
20. Why cane sugar is non reducing ? explain .
21. Give the method for the synthesis of Phenol formaldehyde resine.
22. Explain following - 1.[Sc(H2O)6]+3 is colorless & [Ti(H2O)6]+3 is colored. 2.[Ni(H2O )4]3 is coloured & [Ni(CN)4]3 is
colourless.
3+
223.Account for the following : [Cr(NH3)6] is paramagnetic and octahedral whereas [Ni(CN)4] is diamagnetic and
square planer .
24. Write IUPAC Name of a. [Co(NH3)5ONO]Cl2 b. K3[Cr(CN)6]
25. Arrange the following in the order of oxidising strength – ClO4- , BrO4- & IO326. Arrange the following in the order of acidic strength – (a) HClO , HClO2 , HClO3, HClO4 (b) HI , HBr . HCl
n
27.Complete the following eq – (a) BrO3 + F2 + OH
(b) Ca3P2 + H2O
28. Give the structure of XeOF2 .
29. Give distinguishing test b/n following – (a) HCOOH & Acitic acid (b) Aniline & phenol (c)CH3NH2 & CH3CH2NH2
30. What happen when acetamide is treated with NaOBr ?
31. Write a short note on (a) Rosenmund reaction (b) Aldol condensation
32. Why MnO4- is coloured ?
33. An element has d of 19.35 gm/c.c. and length of side of unit cell is 316 pm. The unit cell is b.c.c. How many atoms
of element does 50 gm of element contain ?
34. Which of the following is more acidic – (a)Acetic acid & Benzoic acid (b) Phenol & ethanol (c) CH3OH & ethanol
35. Explain the basic character of 10 , 20 , 30 – ethyl amine is more basic & why?
36. How can we convert following – (a) Nitro ethane to acetic acid (b) Acetone to tert. butylalcohol
37. “ Ranitidine is an anta acid “. Comment on the statement.
38. What is soap chemically ? Why does it not give sufficient lather with hard water ?
39. What is the function of “equanil “. Give example of broad spectrum?
40. What is the disease caused by deficiency of following vitamins – Vit. A , H , K , B12
41. What is meant by hormones ? What are peptide harmones & their types ?
42. What are biopolymer. Give example?
43. Write short note on – (a) Van-de-arkel method (b) Aluminothermy (b) Illingham diagram
Or
Give the various steps involve in the extraction of Fe from hematite ore ?
PRADEEP SHARMA, INSTITUTE OF COMPETITIVE STUDIES, SECTOR – 15 , SONEPAT
CONTACT NUMBER : 0130 – 2232322 , E – mail : pics4iit@gmail.com
log on to- : www.picsinstitute.com