test_7

Dated: 07/02/10 uration: Two Hour

R a n j e e t SCO 48, II

nd

S h a h i

C h e m i s t r y

C l a s s e s

Floor, Sector 20 C, CHANDIGARH Ph: 2725748,3040660

SCF72,

Sector10,

Panchkula,

Ph:

3914844

Test-7A

1

PRACTICE TEST CHEMISTRY f or or IITIIT-JEE -JEE 2010 Section-A

1.

2.

3.

4.

5.

6. 7.

If nitrogen atoms are represented as filled circles and oxygen atoms as open circles, how much NO 2 can be prepared from the mixture given: (a) 4 (b) 5 (c) 6 (d) 8

D

A 25.0-mL sample of a solution of an unknown compound is titrated with a 0.115 M NaOH solution. The titration curve above was obtained. The unknown compound is __________. (a) a weak acid (b) a strong base (c) a weak base (d) a strong acid Sodium hypochlorite (NaOCl) is a good oxidizing agent in alkaline medium. What volume of a 0.15 M alkaline solution of NaOCl would be required to oxidize completely a 20-mL 0.2 M NaCrO 2 solution according to the reaction: NaOCl + NaCrO 2 + NaOH  NaCl + Na2CrO4 + H2O (a) 80-mL (b) 40-mL (c) 20-mL (d)10-mL For any chemical substance, how many combinations of temperature and pressure will allow the solid and liquid states (but not the gas state) to exist at the same time? (a) 1 -- there is just one unique temperature and pressure where the solid and liquid states can both be stable at the same time. (b) 2 -- there are two extremes of temperature and pressure where solid and liquid can both be stable at the same time. (c) 3 -- there are three unique combinations of temperature and pressure where solid and liquid can both be stable at the same time. (d) an infinite number -- there are infinitely many combinations of temperature and pressure where solid and liquid can both be stable at the same time. Which of the following statements is not true? (a) The pressure of a real gas is greater than, equal to or less than that calculated for an ideal gas. (b) The volume of a real gas is greater than or equal to the volume calculated for an ideal gas. (c) The van der Waals equation helps to calculate the pressure and volume of real gases. (d) Real gas molecules do occupy a finite, but small, volume.

A

Consider the reaction : A  C; ∆H = +35 +35 kcal/m. and the reaction C  B; ∆H = -40 kcal/m. List the enthalpy of of formations of A, B, and C respectively in order of increasing enthalpy( ∆Ho). (a) C, B, A (b) C, A, B (c) A, B, C (d) B, A, C A gas is allowed to expand at constant temperature from a volume of 1.0 L to 10.1 L against an external pressure of 0.50 atm. If the gas absorbs 250 J of heat from the surroundings, what are the values of q, w, and ∆E?

D

q

w

∆E

(a)

250 J

-460 J

-210 J

(b)

-250 J

-460 J

-710 J


nd

S h a h i

q

w

∆E

(c)

250 J

460 J

710 J

(d)

-250 J

460 J

245 J

C h e m i s t r y

C l a s s e s


SCF72,

Sector10,

Panchkula,

Ph:

3914844

Test-7A

2

B

D

B

A

Which of the following represents a reaction condition that will only be spontaneous at HIGH temperatures? (a) ∆HoRXN = negative; ∆SoRXN = positive (b) ∆HoRXN = positive; ∆SoRXN = negative o o (c) ∆H RXN = positive; ∆S RXN = positive (d) ∆HoRXN = negative; ∆SoRXN = negative 9. 0.02 mol/L N 2O(g) and 0.056 mol/L of O 2(g) are reacted at 1000K. The equilibrium concentration of NO 2(g) was found to be 0.02 mol/L. The equilibrium constant K C for the reaction is: 2N2O(g) + 3O2(g)  4NO2(g) (a) 0.043 L/mol (b) 23.2 L/mol (c) 4.3 L/mol (d) 0.43 mol/L 10. Compound A is a D-aldopentose that can be oxidized to an optically inactive aldaric acid. A on treatment with HCN followed by treatment with SnCl 2 /Con. HCl yields B and C. B can be oxidized to an optically active aldaric acid while C is oxidized to an optically inactive aldaric acid. Which of the following is correct labeling of A, B and C? 8.

CH O H OH (a) H OH H OH CH 2 O H

CHO OH OH OH OH CH2OH

H H H H

A

CH O H OH OH OH CH 2 O H

HO H H H

B

CHO H OH (c ) H O H H OH CH2OH A

H H H H

C HO H OH ( b) H OH H OH C H 2O H A

C

CHO OH OH OH OH C H 2O H

HO H H H

B

CHO H OH OH OH CH2OH

A

HO HO H H

H H H H

H H H H

CH O OH OH OH OH CH 2 O H C

11. Losing one electron to become the He cation can singly ionize helium. Which of the following statements is true concerning this helium cation? (a) The spectral lines in the line spectrum of this helium cation will be more closely spaced than spectral lines in the line spectrum of a hydrogen atom. (b) The spectral lines in line line spectrum of this helium cation will will appear at same wavelengths as in the line spectrum of a Li2+. (c) The line spectrum of this helium cation will remain the same as for unionized helium. (d) The line spectrum of this helium cation will have same numbers of spectral lines as in the line spectrum of a hydrogen atom. pyramid molecular geometry? 12. Which of these molecules or ions has a trigonal 2– (a) O3 (b) CO3 (c) PF4+ (d) ClO3 – given a small bar of an unknown metal, whose molar mass is X. You find the density of the metal to be 19.32 13. You are 3 g/cm . An X-ray diffraction experiment measures the edge of the unit cell as 4.07 Å. Assuming that the metal crystallizes in a face-centered cubic lattice, what is the most likely atomic weight of X? (a) 197 (b) 108 (c) 63.5 (d) 206 14. Which of the following substances lowers the freezing point of an aqueous solution t he least? (a) 0.10 M KBr (b) 0.10 M CaCl2 (c) 0.05 M Mg(NO3)2 (d) 0.05 M Al(NO3)3 15. The cell shown below generates a potential of 0.65V at 300K. K sp for AgBr is ? Ag | AgBr(s), NaBr (0.10M) | | AgNO 3 (0.10M) | Ag ∆E = 0.65V -9 -30 -13 (a) 1.15 x 10 (b) 2.00 x 10 (c) 1.25 x 10 (d) 3.5 x 10-11 16. Ethylene is reacted with bromine water containing chloride ion and nitrate ion. Which of the following compounds is NOT formed ? (a) Br(CH2)2Br (b) Br(CH2)2Cl (c) Br(CH2)2OH (d) Br(CH2)2ONO2


nd

S h a h i

C h e m i s t r y

C l a s s e s


SCF72,

Sector10,

Panchkula,

Ph:

3914844

B

C

CHO H H OH OH CH2OH B

B

C HO OH OH OH OH C H 2O H

B

CH O H OH ( d) H OH H OH CH 2 O H

C

+

HO H H H

CHO H OH OH OH CH2O H

C

Test-7A

3

D

D A

A C

C

17. The order of stability of complex of trimethyl amine with BX 3 is BF3 < BCl3 < BBr3. The correct statement concerning this order is: (a) This order is as expected based on the relative electronegativities of halogens. (b) This order is contrary to the acid strength, and is due to deviation from planarity of the molecule. (c) This order is expected order in accordance with their acid str ength. (d) This order is unexpected based on the electronegativities of the halogens and attributed to π-bonding between 2pX and the empty B 2p orbitals. 18. The first order decomposition of dinitrogen pentaoxide, N2O5, was studied in chloroform solution at 45°C and the results are expressed on the diagram in the right margin. From the diagram, The expected value for the specific rate constant k for the reaction is: 2 N2O5 → 2 N2O4 + O2 (a) 6.2 x 10 –4 s –1 (b) 9.7 x 10 –5 s –1 (c) 8.7 x 10 –3 s –1 (d) 5.4 x 10 –6 s –1

C

19. An Au(NO3)3 solution containing a gold electrode is connected by means of a salt bridge to a PbCl 2 solution containing lead electrode. Which of the following is the correct representation of this Galvanic cell?

D

20. The order of reactivity of the following alkenes towards electrophilic attack is : Propene(i) Propenoic acid(ii) Ethylene(iii) 2-methylpropene(iv) (a) (i) > (iii) > (iv) > (ii) (b) (i) > (iii) > (ii) > (iv) (c) (iv) > (i) > (iii) > (ii) (d) (i) > (iv) > (iii) > (ii) 21. What would be the product from the photochemical monochlorination of propane at room temperature? (a) 1-chloropropane (b) 2-chloropropane (c) an approximately equal mixture of 1-chloropropane and 2-chloropropane (d) a mixture of 75% 1-chloropropane and 25% 2-chloropropane to be a resonance form of the others in the group? 22. Which of the following structures is least likely to

C

O

O (a) CH3CH=CH

C

(b) CH3CH=CH

NH 2

_ C NH2

(c) CH3CH=CH

C

+

C

B

_ O

_ O

+

NH2

(d) CH3CH=CH

+

C

NH2

23. Which of the following represents best possible starting route for the synthesis of cyclohexanecarboxylic acid. O NaOEt NaOEt (b) (a) CH2(COOEt)2 COOEt Br(CH2)4Br I-(CH2)5-I H3C COOEt (c) H3C

COOEt


nd

O

NaOEt I2

(d) H3C

S h a h i

COOEt

C h e m i s t r y

NaOEt Br-(CH2)5-Br

C l a s s e s


SCF72,

Sector10,

Panchkula,

Ph:

A

3914844

Test-7A

4

B

organic halides towards unimolecular solvolysis? 24. What is the order of reactivity of these organic Br

C

(I)

(II) CH2=CH.CH2Br (III) Ph.CH2.CH2Br (IV) CH2=CH.CH2.CH2.Br (a) I > II > III > IV (b) I > II > IV > III (c) II > III > IV > I (d) II > III > I > IV 25. A carboxylic acid X is treated with bromine (1 mole) in the presence of a little phosphorus. The isolated product is heated with a strong base and in turn oxidized. One of the two oxidation products is a neutral compound which reacts with hydroxylamine to give oximes; X is (a) CH3CH2CH(CH3)CO2H (b) C6H5CH2CH2CO2H (c) (CH3)2CHCH2CO2H (d) CH3CH2CH(CH3)CH2CO2H n l m l l m s n l m l l m s s s 26. Which is a possible set of quantum numbers for a valence electron in ground state atom of phosphorus? (a) 2 1 0 +½ (c) 3 1 -1 +½ (b) 3 0 0 0 (d) 3 2 1 -½ 27. Which one of the following statements is true? (a) Acetamide is a liquid with an ammoniacal smell, which reacts with mineral acids t o form stable salts. (b) Acetamide is a solid, acidic to litmus, which reacts with sodium hydroxide to liberate ammonia. (c) Acetamide reacts with benzene sulphonyl chloride in alkaline soluton to give a crystalline sulphonamide. (d) Acetamide reacts on warming with phosphorous pentaoxide to give acetonitrile. 28. Which of the following is most expected product in the following reaction? CH3 CH3 CH3 CH3 H2SO4 O (c) (a) (d) (b) H3C HO OH heat H2C CH2 O 29. Select the best reaction sequence to accomplish the following transformation:

D

C

D

C

D

O

Cl

HNO3 (a) H2SO4

NH2

HNO3 (b) H2SO4

Zn(Hg), HCl excess

AlCl3

Zn(Hg) ClH

AlCl3

Zn(Hg), HCl excess

O

O HNO 3 (c) H2SO4

Cl

Cl

Cl AlCl3

Zn(Hg), HCl excess

(d)

AlCl3

HNO3 H2SO4

Zn(Hg), HCl excess

30. Amino acids have higher melting points than either amine or acid of comparable molar masses due to? (a) It has more sites available for H-bonding than either amine or acid. (b) In solid state, an amino acids exist predominantly as zwitterionic form. (c) In solid state, amino acids have more effective packing of molecules than either amine or acid. (d) None of the above is correct explanation. Section-B

31.

B

The following Eitht questions may have more than one correct answer.

Which of the following statements are true for the molecule shown below? CH3 CO

H N

Cl N H

CO Cl


nd

CH3

S h a h i

C h e m i s t r y

C l a s s e s


SCF72,

Sector10,

A D

(a) The compound is optically active. (b) The compound has a plane of symmetry. (c) The compound has a center of symmetry. (d) The compound has an axis of symmetry.

Panchkula,

Ph:

3914844

Test-7A

5

32. Which of the following have all the resonance structures more stable than t he shown one?

(a)

+

(b)

+

(c)

+

+

(d)

O

B D

OMe

33. Which of the following compound(s) on treatment with dilute base followed by heating of resulting aldol will produce more than one dehydration products? (a) Ethanal (b) Acetone (c) Propanal (d) 4-methyl cyclohexanone

A C D

34. What are the final product(s) of the following reactions?

A B

PCl5

O + H2NOH

O O (a)

NH

(b)

NH

O (c)

NH

O

(d) N H

35. Which of the following statements is(are) true? (a) The ratio of the average speed to the r.m.s. speed is independent of the temperature. (b) The square of the mean speed of the molecules is equal to the mean squared speed at a certain temperature. (c) Mean kinetic energy of the gas molecules at any given t emperature is independent of the mean speed. (d) The difference between r.m.s. speed and average speed at any temperature for different gases diminishes as larger and yet larger molar masses are considered. 36. Which of the following is(are) correct colligative observations? (a) As surface area of a volatile liquid is decreased at constant temperature, some vapour molecules condenses back decreasing the number of molecule in vapour phase in equilibrium with liquid phase. (b) When a non volatile solute is added to a volatile solvent, a stronger intermolecular Solute-solvent attraction is established lowering the vapour pressure. (c) When a non-volatile solute is added to a volatile solvent, vapour pressure is lowered and resulting solution require higher temperature compared to pure solvent in order to take its vapour pressure equal to external pressure. (d) A solution of non-volatile solute in a volatile solvent is first heated to temperature slightly above to its boiling point and then finally cooled for freezing. The final solution will start freezing at higher temperature than the original solution.

A C D

37. When a micelle is formed, at critical micelle concentration (a) Conductance decreases abruptly (b) Surface tension decreases abruptly (c) Boiling point of solution is less then the boiling point when concentration is less then CMC. (d) Coagulation takes place.

A B C

38. What is true regarding aspartic acid? (a) An aqueous solution of pure aspartic acid has pH < 7. (c) At pH = 8, it bears net negative charge.

A C

(b) At pH = 6, it bears net positive charge. (d) It is a monobasic amino acid.

A C

Section C Following five questions contains Assertion and and Reasons . Answer them according to following options: ( a ) Both assertion and reason are correct and reason is the correct explanation of assertion. ( b ) Both assertion and reason are correct but reason is not the correct explanation of assertion. ( c ) Assertion is correct but reason is wrong. ( d d ) Assertion is wrong but reason is true.

39. A: The thermodynamic function, which determines the spontaneity of a process, is the free energy. R: The change in entropy must be always positive in order t o make ∆G negative, which ensure the spontaneous process.


nd

S h a h i

C h e m i s t r y

C l a s s e s


SCF72,

Sector10,

Panchkula,

Ph:

3914844

Test-7A

6

C

funct ion of temperature and nature of catalyst only. 40. A: Rate of catalytic hydrogenation of alkene is function R: Catalytic hydrogenation of alkene follows zero order kinetics. 41. A: According to law of mass action, active masses of solids and pure liquids are taken to be unity. R: Concentration of solids and pure liquids are constant in a given condition of temperature and pressure. 42. A: Orthonitrophenol is more volatile than its para isomer. R: Paranitrophenol shows intr amolecular H-bonding whereas orthonitrophenol shows int ermolecular H-bonding. 43. A Alkynes are more reactive than alkenes towards electrophilic addition reaction R Alkynes have greater electron density than alkene at multiple bond Section-D

D A C D

The following Nine questions are based on Passages. Read the corresponding passage and answer the following questions based on the information provided in the passage.

Passage-1:

B

An electrochemical cell with inert platinum electrodes is shown on right: The half cell reactions are: Fe + + e-  Fe + Eo =+0.77 V at 25 oC VO2+ + 2H+ + e-  V3+ + H2O Eo =+0.34V at 25 oC 44.

KCl

The statement which is incorrect about this cel is: (a) Eocell is 0.43 V. (b) Electrons flow from left to right electrode. (c) If some Fe 3+ is added to left half-cell, E cell increases. (d) If some VCl 3 is added to right half-cell, E cell increases.

Pt

Fe +, Fe + and Cl +

Pt

V +, VO + and H+

45. Emf of the cell when all the species are at 1.0 M except H which is at 0.01 M is: (a) 1.35 V (b) 0.55 V (c) 0.67 V (d) 0.194 V

C

46. The maximum useful work that can be obtained from this cell under standard condition is: (a) 32.8 kJ (b) 41.5 kJ (c) 74.3 kJ (d) 107 kJ

B

Passage-2:

In a student experiment designed to demonstrate microscale extraction techniques, the three compounds shown below are dissolved in diethyl ether and separated: O

H3COOC (X)

COOH

NH2 (Y)

(Z)

The mixture is created by dissolving 50 mg of each compound in diethyl ether. Some 2M HCl is then added creating a two phase system. The system is mixed thoroughly and then allowed to separate. The aqueous layer is removed and the step is repeated with reminder of the mixture. 6M NaOH is added to the extracted aqueous solution. The solution is cooled in an ice bath and precipitate is collected and washed. The remaining mixture is now separated by extraction with some 3M NaOH. 6 M HCl is added to the alkaline solution, which is then cooled to form a precipitate. The remaining component is washed with distilled water. Next, some Na2SO4 is added. The Na 2SO4 is then filtered off using a filter paper and the remaining solution is transferred to an Erlenmeyer flask. 47. Which of the following comes out in aqueous layer of the f irst extraction with 3M HCl? (a) X (b) Y (c) Z (d) diethyl ether


nd

S h a h i

C h e m i s t r y

B

C l a s s e s


SCF72,

Sector10,

Panchkula,

Ph:

3914844

Test-7A

7

48. What is the expected molecular weight of the compound extracted by NaOH? (a) 46 (b) 122 (c) 165 (d) 180 49. If the last fraction present in the Erlenmeyer flask is treated with Fe/Br 2, the major monobromination product would be?

D

O

Br

(b) H3COOC

(a) Br

NH2

O Br

COOH

(c)

(d) Br

Passage-3:

A white, anhydrous solid A is water soluble. An aqueous solution of A gives a white precipitate with BaCl 2. The precipitate thus obtained is then fused with Na 2CO3 on charcoal and the fusion mixture is extracted in water. This extract on treatment with freshly prepared sodium nitroprusside solution gives a transient purple colouration. A also gives the following reaction: A(aq) + K4[Fe(CN)6]  White precipitate, insoluble in dilute acid. ( NH ) [ Hg ( SCN ) ] A(aq) + CuSO4 + H+    → B(violet precipitate) A(s) + Cu(NO3)2 + Heat  C(green, infusible residue) 4 2

4

50. The salt A is: (a) Al2(SO4)3

(b) Pb(NO3)2

(c) CaSO4

(d) ZnSO4

51. Precipitate B is: (a) Pb[Hg(SCN) 4]

(b) Cu[Hg(SCN)4]

(c) Zn[Hg(SCN)4]

(d) both b and c

52. The residue C is: (a) CoAl2O4

(b) PbCoO2

(c) ZnCoO2

Section E Column-I

Boron(B) Silicon(Si) P4 Cl2

Column-II

Column-I

K4[Fe(CN)6] [Fe(CO)5] [Ti(H2O)6](NO2)2 K4[Sc(SCN)6]

SCO 48, II

nd

Column-II

(P) Diamagnetic (Q) Show Linkage isomerism (R) Show d –p bonding. (S) Paramagnetic π

R a n j e e t

S h a h i

π

C h e m i s t r y

Ans A: PQS B:PRS C:Q D:Q Ans A: PQR B:PR C:S D:QS

C l a s s e s


SCF72,

Sector10,

C

(d) CaCoO2

(P) Can be prepared by thermal decomposition of their iodide. (Q) Its oxide gives acidic solution in water. (R) Its organohalide, on hydrolysis gives polymer. (S) Its hydrides are good reducing agent.

54. Match the quantity from column-I with that in column-II: (A) (B) (C) (D)

D

Matrix Matching Type Questions


D

Panchkula,

Ph:

3914844

Test-7A

8

55. Match the reactions of column-I with the properties of products in column-II: H

Br (A)

Ans: A: PQ B: PQ C: S D:R

Column-II

Column-I Br2 /CCl4

H

(P) one of the product is a meso form

CH3

H3C H

Br

H Ph

Ph (B) O2N

NO2

Br2

(Q) pair of distereomers

heat

a pure enantiomer CH3O

CH3

H

Cl

(C) H3 C (D)

H

H

Cl CH3

H3C

H

CH3ONa CH3OH

(R) pair of enantiomers

(S) only meso

NaCN(aq) one equivalent

Cl


Column-I

Wave function ( ψ ) Probability density ( ψ ) Probability of finding an electron at distance r from nucleus. Radial wave function.


nd

S h a h i

(P) Depends only on “n” and “l” (Q) Depends Depends on “n”, “l” and “m”. (R) Changes sign at nodes.

Ans A: QRS B:QS C:Q

(S) Maximum at nucleus for 1s orbital.

D:PRS

Column-II

C h e m i s t r y

C l a s s e s


SCF72,

Sector10,

Panchkula,

Ph:

3914844

Test-7A

9

Answer Sheet Name: ______________________________________________________ Batch: ______________________________________________________ 1.

A

B

C

D

21.

A

B

C

D

41.

A

B

C

D

2.

A

B

C

D

22.

A

B

C

D

42.

A

B

C

D

3.

A

B

C

D

23.

A

B

C

D

43.

A

B

C

D

4.

A

B

C

D

24.

A

B

C

D

44.

A

B

C

D

5.

A

B

C

D

25.

A

B

C

D

45.

A

B

C

D

6.

A

B

C

D

26.

A

B

C

D

46.

A

B

C

D

7.

A

B

C

D

27.

A

B

C

D

47.

A

B

C

D

8.

A

B

C

D

28.

A

B

C

D

48.

A

B

C

D

9.

A

B

C

D

29.

A

B

C

D

49.

A

B

C

D

10.

A

B

C

D

30.

A

B

C

D

50.

A

B

C

D

11.

A

B

C

D

31.

A

B

C

D

51.

A

B

C

D

12.

A

B

C

D

32.

A

B

C

D

52.

A

B

C

D

13.

A

B

C

D

33.

A

B

C

D

53.

14.

A

B

C

D

34.

A

B

C

D

15.

A

B

C

D

35.

A

B

C

D

16.

A

B

C

D

36.

A

B

C

D

17.

A

B

C

D

37.

A

B

C

D

18.

A

B

C

D

38.

A

B

C

D

19.

A

B

C

D

39.

A

B

C

D

20.

A

B

C

D

40.

A

B

C

D


nd

S h a h i

54.

55.

56.

C h e m i s t r y

C l a s s e s


SCF72,

Sector10,

Panchkula,

Ph:

3914844

Test-7A

10

Answers +2 Test Series

Set-A

Test-7

07-02-2010

Set-B

Set-ABC

1.

D

1.

D

31.

AD

2.

A

2.

D

32.

BD

3.

B

3.

C

33.

ACD

4.

D

4.

A

34.

AB

5.

B

5.

D

35.

ACD

6.

D

6.

A

36.

AC

7.

A

7.

C

37.

ABC

8.

C

8.

B

38.

AC

9.

B

9.

D

39.

C

10.

B

10.

B

40.

D

11.

D

11.

B

41.

A

12.

D

12.

C

42.

C

13.

A

13.

B

43.

D

14.

A

14.

C

44.

B

15.

C

15.

C

45.

C

16.

C

16.

D

46.

B

17.

C

17.

A

47.

B

18.

A

18.

A

48.

B

19.

D

19.

D

49.

D

20.

C

20.

C

50.

D

21.

C

21.

B

51.

D

22.

B

22.

C

52.

C

23.

B

23.

D

53.

A: PQS, B:PRS

24.

C

24.

C

25.

D

25.

A

26.

C

26.

B

27.

D

27.

D

28.

C

28.

C

29.

D

29.

B

30.

B

30.

D


nd

S h a h i

C:Q, D:Q 54.

A: PQR, B:PR C:S, D:QS

55.

A: PQ, B:PQ C:S, D:R

56.

A: QRS, B:QS C:Q, D:PRS

C h e m i s t r y

C l a s s e s


SCF72,

Sector10,

Panchkula,

Ph:

3914844

Test-7A

11

test_7

Recommend Documents