MAHA SET 2018 Question Paper 2 Chemical Science

Test Booklet Code & Serial No.
A
CHEMICAL SCIENCE
Signature and Name of Invigilator Seat No.
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(Name) ................................................ OMR Sheet No.
JAN - 33218 (To be filled by the Candidate)
Time Allowed : 1¼ Hours] [Maximum Marks : 100
Number of Pages in this Booklet : 20 Number of Questions in this Booklet : 50
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Chemical Science
Paper II
Time Allowed : 75 Minutes] [Maximum Marks : 100
Note : This Paper contains Fifty (50) multiple choice questions. Each question
carrying Two (2) marks. Attempt All questions.
1. The number of Metal-Metal bonds in [Re2Cl8]2– is/are :
(A) One (B) Two
(C) Three (D) Four
2. The structure of (NH3)3CrO4 is :
(A) Trigonal bipyramid (B) Pentagonal bipyramid
(C) Square Pyramid (D) Pentagonal Pyramid
3. In gas chromatography, the basis of separation of the components is the
difference in :
(A) Conductivity (B) Molecular Weight
(C) Molarity (D) Partition Coefficient
4. The normality of a solution is determined by four separate titrations, the results
being 0·2041, 0·2049, 0·2039 and 0·2043. The average deviation for the results
is :
(A) 0·0003 (B) 0·2043
(C) 0·0006 (D) 0·0009
5. In the Kroll process Titanium is extracted by reducing TiCl4 with..............
metal.
(A) Barium (B) Magnesium
(C) Aluminum (D) Zinc
6. The X-band EPR spectra of phenyl radical will exhibit.................lines.
(A) 3 (B) 8
(C) 18 (D) 28

3 [P.T.O.

7. The staggered configuration of ferrocene [Fe( 5-C5H5)2] belong to................
symmetry group.

(A) C 5v (B) C 5h

(C) D5d (D) D5h

8. The spin only magnetic moment for a first row transition metal ion with 3F 4
ground state term is :

(A) 3·87 B.M. (B) 4·90 B.M.

(C) 2·83 B.M. (D) 5·92 B.M.

9. Crystal Field Stabilization Energy for a d3 ion in tetrahedral geometry is :

(A) –1·2 (B) –0·8

(C) –0·4 (D) 0·0

10. Which of the following statements is true with respect to 57Fe Mossbauer
spectra of (i) FeSO4·7H2O, (ii) K4[Fe(CN)6], (iii) Na2[Fe(CN)5NO]·2H2O ?

(A) singlet in (i), doublet in (ii) and (iii)

(B) singlet in (ii), doublet in (i) and (iii)

(C) singlet in (i), and (iii), doublet in (ii)

(D) doublet in (i), (ii) and (iii)

11. The geometry of the interhalogen compound BrF 3 is :

(A) Square planar (B) Tetrahedral

(C) Octahedron (D) Trigonal bipyramid

4

12. The IUPAC nomenclature of [Co·Cl·CN·NO2·(NH3)3] is :

(A) Triamminechloridocyanidonitrocobalt (III)

(B) Chloridocyanidonitrotriamminecobalt (III)

(C) Cyanidochloridonitrotriamminecobalt (III)

(D) Triamminechloridonitrocyanidocobalt (III)

13. The cation of dichloro bis(ethylenediamine) cobalt (III) belongs to D3 symmetry
is an example of :

(A) Coordination isomerism (B) Optical isomerism

(C) Linkage isomerism (D) Ionization isomerism

14. The 1G term of nd2 configuration can be assigned to :

(A) 45 microstates (B) 9 microstates

(C) 21 microstates (D) 15 microstates

15. The F—N—F bond angle in NF3 is :

(A) 109° 28 (B) 107° 48

(C) 102° 30 (D) 104° 27

16. The correct order of First Ionization energy of group 13 elements is :

(A) B > Tl > Ga > Al > In (B) B > Tl > Al > Ga > In

(C) B > Al > Ga > In > Tl (D) B > Ga > Tl > In > Al

17. The ionophore valinomycin is highly selective for :

(A) K+ (B) Na+

(C) Mg2+ (D) Ca2+
5 [P.T.O.

18. Common feature of CO, CN– and NO+ ligands is :

(A) They have empty orbitals

(B) They act as donor ligands

(C) They are all weak field ligands

(D) They decrease the value of 0

19. Number of stereoisomers possible for the compound, CH3CH = CH—CH(OH)CH

= CHCH3 is :

(A) 4 (B) 6

(C) 7 (D) 8

20. The correct order of acidity for the following compounds is :

(A) III > I > II > IV (B) II > III > I > IV

(C) IV > II > I > III (D) III > II > I > IV

6

21. Number of signals observed in the 1H NMR and proton decoupled 13C NMR
spectrum of the following compound, respectively, are :

(A) 4, 4 (B) 5, 4
(C) 8, 7 (D) 8, 4
22. The major product formed in the following reaction is :

(A) (B)

(C) (D)

7 [P.T.O.

23. Amongst the following, the compound that will show IR absorption band at
1780 cm–1 is :

(A) (B)

(C) (D)

24. Major product of the following reaction is :

(A) (B)

(C) (D)

8

25. The correct IUPAC nomenclature of the following compound is :

(A) 5-Bromo-2-chloroheptane (B) 2-Chloro-5-bromoheptane

(C) 3-Bromo-6-chloroheptane (D) 6-Chloro-3-bromoheptane

26. Number of signals observed in the 1H NMR spectrum is p-tolualdehyde is :

(A) 3 (B) 4

(C) 5 (D) 6

27. The correct absolute configuration for the chiral centers in the following

compound is :

(A) 1S, 4S (B) 1S, 4R

(C) 1R, 4R (D) 1R, 4S

9 [P.T.O.

28. Major product formed in the following reaction is :

(A)

(B)

(C)

(D)

10

29. Multiplicity of the signal expected in the 1H NMR spectrum of the following
compound is :

(A) singlet (B) doublet

(C) triplet (D) AB quartet

30. The correct IUPAC nomenclature of the following compound is :

(A) 2-Nitro-5-carbaldehydo anisole

(B) 2-Methoxy-4-carbaldehydo nitrobenzene

(C) 4-Nitro-5-methoxy benzaldehyde

(D) 3-Methoxy-4-nitro benzaldehyde

11 [P.T.O.

31. The least stable conformation of 2-methylbutane is :

(A)

(B)

(C)

(D)

12

32. The major product formed in the following reactions is :

(A)

(B)

(C)

(D)

13 [P.T.O.

33. Major product formed in the following reaction is :

(A) (B)

(C) (D)

34. Chiral compound amongst the following is :

(A) (B)

(C) (D)

14

35. The freezing point of a mixture containing 1·60 g of naphthalene (molar

mass = 128 g mol–1) and 20 g of benzene (molar mass = 78 g mol–1) is 2·8°C

and that of pure benzene is 5·5°C. The value of the molal freezing point

depression constant of benzene is :

(A) 4·3°C kg mol–1 (B) 4·3°C g mol–1

(C) 4·3°C mol kg–1 (D) 5·1°C mol g–1

36. T h e vapou r pr essu r e of 0·5 M aqu eou s K N O 3 solution is 749·7 torr at 100°C.

The activity of water in this solution at 100°C is :

(A) 0·9218 (B) 1·0023

(C) 1·0230 (D) 0·9864

37. When an ideal kept in a closed container at constant volume was cooled from

50°C to 25°C, it will lead to :

(A) Increase in the numbers of collisions per unit time

(B) Increase in the mean free path of the gas

(C) Increase in the average velocity of the gas

(D) Decrease in the average velocity of the gas

15 [P.T.O.

38. For the decomposition reaction
A3 3/2A2
The following concentration Vs. time profiles were obtained. At time tA,
percentage of A3 decomposed is :

(A) 75 (B) 50
(C) 25 (D) 10
39. In the reaction :
Cl 2(g) + 3F2(g) 2ClF3; Hr = – 329 kJ
When the reaction is in equilibrium, which of the following will increase the
amount of ClF3 ?
(I) Increasing the temperature
(II) Increasing the volume of the reactor
(III) Removing Cl2
(IV) Adding F2
(A) I, II and III (B) IV only
(C) I and IV (D) II and IV
40. In the reaction :
ZnO + X + heat Zn + XO
Which element represented by X is industrially used to produce Zn metal ?
(A) Cu (B) C
(C) Hg (D) Pb
16

41. Which of the following is not a redox reaction ?

(A) CuO + H2 — Cu + H2O

(B) Fe2O3 + 3CO — 2Fe + 3CO2

(C) 2K + F2 — 2KF

(D) BaCl2 + H2SO4 — BaSO4 + 2HCl

42.

Which of the following statements best describes the flow of electrons in the
above electrochemical cell ?

(A) From Pb electrode to Zn electrode through the Cu wire

(B) From Pb electrode to Zn electrode through the salt bridge

(C) From the Zn electrode to Pb electrode through the salt bridge

(D) From Zn electrode to Pb electrode through Cu wire

43. A radioactive substances has half life of 140 days. The fraction of the substance
that will remain after 2 years and 250 days is :

(A) 1/7 (B) 1/14

(C) 127/128 (D) 1/128

17 [P.T.O.

44. To balance the following reaction :
2– 2–
SO3(aq.) H2O SO4(aq.) 2H (aq.)

one needs to :
(A) Add 2H2O to the left side
(B) Add 2e– to the right side
(C) Add 2e– to the left side
(D) Multiply both sides by a factor of 2
45. When a small amount of copper powder is added to ZnSO 4 solution, what
would be the observation ?
(A) Effervesence (B) Precipitation of a white solid
(C) Formation of a blue solution (D) No reaction
46. General acid (A) Base (B) titration curve is represented as follows :

What should be the equation for estimation of pH at point (L) :
1 1
(A) pH = pKw + log [B] (B) pH = pKa + pKw
2 2
1 1
(C) pH = pKa – log [A]initial (D) pH = pKa
2 2

18

47. The stoichiometric point of the titration of 25·0 mL, 0·100 M HClO with 0·10 M

NaOH(aq) occurs when the molar concentration of NaClO is 0·050 M. The

pH of this solution is about (given pKa of HClO = 7·43; log 0·05 = – 1·301)

(A) 2·63 (B) 3·94

(C) 10·10 (D) 11·36

48. Hydride ion (H–) is :

(A) Not isoelectric with He (B) Bronsted-Lowrry base of H2

(C) Bronsted acid of OH– (D) A Lewis acid

49. The pH of 0·2M HCN(aq.) is (pKa of HCN = 9·31; log10 2 = 0·3010 and

log10 0·2 = – 0·6990) :

(A) 5·0 (B) 9·6

(C) 8·6 (D) 4·3

50. Which of the following is the strongest conjugate base ?

(A) ClCH2COO– (B) Cl·CH2·CH2COO–

(C) CH3COO– (D) Cl2CHCOO–

19 [P.T.O.

ROUGH WORK

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