AIIMS MBBS Entrance Exam Model Question Paper

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AIIMS MBBS Entrance Exam Question Paper


Chemistry

1. Aspirin acts as an analgesic because it

(a) inhibits the synthesis of prostaglandins which stimulates inflammation of the tissue
(b) prevents the release of HCL in the stomach
(c) Prevents the interaction of histamine with its receptor
(d) inhibit activities of enzymes

2. Starch is a mixture of two components, a water soluble component amylase (15-20%) and a water insoluble component amylopectin (80-85%). The aqueous solution, of amylase gives a blue colour with iodine solution due to the formation of

(a) amylose iodide
(b) amylose iodate
(c) inclusion complex
(d) amylase tetraiodide complex

3. What reagent is used in the Hinsberg test of amines?

(a) (CH3CO)2O and pyridine
(b) C6H3SO2CI in aq NaOh
(c) NaNo2 in aq H2 SO4
(d) CH3l(excess) followed by AgOH

4. Aldol condensation between which of the following two compounds followed by dehydration gives methyl vinyl ketone?

(a) Formaldehyde and acetone
(b) Formaldehyde and acetaldehyde
(c) Two molecules of acetone
(d) Two molecules of acetaldehyde

5.Grignard reagents and organolithium compounds on addition to dry ice separately, followed by hydrolysis gives

(a) ketones and carboxylic acids respectively
(b) carboxylic acids and ketones respectively
(c) only carboxylic acids
(d) onty ketones

6.The strongest acid among the following is

(a) o-methoxy phenol
(b) p-methoxy phenol
(c) m-methoxy phenol
(d) phenol

7. On commercial scale phenol is obtained from chlorobenzene. The chlorobenzene needed for the purpose is prepared by Raschigs process. Which one of the following is Raschigs process?

8. How many mL of 0.125 M Cr3+ must be reacted with 12.00 mL of 0.200 M MnO4 if the redox products are CrO2/7 and Mn2+?

(a) 8 mL
(b) 16 mL
(c) 24 mL
(d) 32 mL

9. At 300 K, 36 g of glucose present per litre in its solution has an osmotic pressure of 4.98 bar. If the osmotic pressure of solution is 1.52 bar at the same temperature, what would be its concentration?

(a) 11gL-1
(b) 22gL-1
(c) 36gL-1
(d) 42gL-1

10. The composition of a sample of wustite is Fe0.93O. What percentage of the iron is present in the form of Fe (III)?

(a) 5%
(b) 7 08%
(c) 15.05%
(d) 23.6%

11. When acidified K2Cr2O7 solution is added to Sn2+ salts, then Sn2+ changes to

(a) Sn
(b) Sn3-
(c) Sn4+
(d) Sn4+

12. What would be the expected product of the reaction of propyne with Br2/H2O if the mechanism of this reaction is analogous to that of propene?

(a) 2-brompropenol
(b) Bromoacetone
(c) 2-boromo-b-propanol
(d) Bromoprophenol

13. Which of the following carbocation would have the greatest stability?

14. Electron affinity is positive, when

(a) O changes into O
(b) O changes into O2-
(c) O changes into O+
(d) election affinity is always negative

15. Which one of the following pairs represents stereoisomerism ?
(a) Chain isomerism and rotational isomerism
(b) Structural isomerism and geometrical isomerism
(c) Linkage isomerism and geometrical isomerism
(d) Optical isomerism and geometrical isomerism

16. Using the data given below find out the strongest reducing agent

17. EMF of Daniell cell was found using different concentrations of Zn2+ ion and Cu2+ ion. A graph was then plotted between Ecell and log [Zn2+]/[Cu2+] found to be linear with intercept on Ecell axis equal to 1.10 V.Ecell for Zn/Zn2+ (0.1M)|| Cu 2+ (00.1M)| Cu will be

(a) 1.10 V
(b) 1.0705 V
(c) 0.93 V
(d) 0.078 V

18. Which of the following process is not responsible for the presence of electric charge on the sol particles?

(a) Electron capture by sot particles
(b) Adsorption of one species from solution
(c) Formation of Helmholtz electrical double layer
(d) Absorption of ionic species horn solution

19. In the metallurgy of aluminium

(a) Al3+ is oxidised to Al (s)
(b) graphite anode is oxidised to carbon monoxide and carbon dioxide
(c) oxidation state of oxygen changes in the reaction at anode
(d) oxidation state of oxygen changes in the overall reaction involved in the process

20. In the preparation of HNO3 we get NO gas by catalytic oxidation of ammonia. The moles of NO produced by the oxidation of two moles of NH3 will be

(a) 2
(b) 3
(c) 4
(d) 6

23. The thermal decomposition of HCOOFI is a foot order reaction with a rate constant of
2.4 x 10-3s-1 at certain temperature. Calculate how long will it take for three fourths of initial quantity of HCOOII decompose?

(a) 578 s
(b) 225 s
(c) 436 s
(d) 578 s

24. Rate constant k of a reaction varies, with temperature according to the equation log k = constant Ea/2.303R x 1/T where Eais the energy of activation for the reaction When a graph is plotted for log k vs 1/T a straight line with a slope -6670 k is obtained. The activation energy for this reaction will be (R=8.314JK-1mol-1)

(a) 122.65 kJmol-1
(b) 127.71 kJmol-1
(c) 142.34 kJmol-1
(d) 150.00 kJmol-1

25. Which of the following statements is not correct about order of a reaction?
(a) The order of a reaction can be a fractional number
(b) Order of a reaction is exeperimentally determined quantity
(c) The order of a reaction is always equal to the sum of the stoichiometric coefficients of reactants In the balanced chemical equation for a reaction
(d) The order of a reaction is the sum of the powers of molar concentrations of the reactants in the rate law expression

26. Which of the following reagents would not be a good choice for reducing an aryl nitro compound to an amine?

(a) H2 (excess)/Pt
(b) LiAIH in ether
(c) Fe anc HCl
(d) Sn and HCl

27. Which is the correct statement about birth control pills?

(a) Contain estrogen only
(b) Contain progesterone only
(c) Contain a mixture of estrogen and progesterone derivatives
(d) Progesterone enhances ovulation

28.

29. Glycogen is a branched chain polymer of α-D-glucose units in which chain is formed by C1 C4 glycosidic linkage whereas branching occurs by the formation of C1 C6 glycosidic linkage. Structure of glycogen is similar to
(a) amylose
(b) anylopectin
(c) cellulose
(d) glucose

30. Each polypeptide in a protein has amino acids linked with each other in a specific sequence. This sequence of amino acids is said to be

(a) primary structure of proteins
(P) secondary structure of proteins
(o) tertiary structure of proteins
(d) quaternary structure of proteins

31. The anticodon transfer RNA for the messenger RNA codon GCA is

(a) TGA
(b) GUT
(c) AGT
(d) CGU

32. Which one of the following statements is wrong?

(a) Fuel obtained from plastic waste has high octane rating
(b) H2O2 with suitable catayst is now used in bleaching of paper
(c) Now-a-days ethanol is produced by one step oxidation of ethane in presence of ionic catalyst in aqueous medium
(d) The growth of fish gets inhibited, if the concentration of dissolved oxygen of water in over 6 ppm

33. The enthalpies of all elements in their standard states are

(a) unity
(b) zero
(c) <0
(d) different for each element

34. 2 L of an ideal gas at a pressure of 10 atm expands isothermally into a vacuum until its total volume is 10 L. How much work is done in the expansion?
(a) 8 L-atm
(b) 16 1 L-atm
(c) 24.0 L-atm
(d) No work is done

35. Predict in which of the following entropy decreases.
(a) A liquid crystallizes into a solid
(b) Temperature of a crystalline solid is raised from 0 K to 115 K
(c) 2NaHCO3 (s) → Na2CO3 (s)
+CO2(g)+H2O(g)
(d) H2

36. The number of unpaired electrons in a paramagnetic diatomic molecule of an element with atomic number 16 is
(a) 1
(b) 2
(c) 3
(d) 4

37. How many σ and π bonds are in SO42- ion?
(a) 4.2
(b) 3.2
(c) 4.3
(d) 3.3

38. The shape of the orbital with the value of
l= 2m =0 is
(a) spherical
(b) double dumb-bell
(c) trigonal planar
(d) square planar

39. For the reaction, 1 g mole of CaCO3 is enclosed in 5 L container
CaCO3(s) → CaO(s) CO2(g)
Kp= 1.16 at 1073 K then per cent dissociation of CaCO3 is
(a) zero
(b) 6.58%
(c) 65%
(d) 100%
40. Ionic product of Ni(OH)2 is 2.0 x 10-15 Molar solubility of Ni(OH)2 in 0.10 M NaOH will be
(a) 1.0 x 10-13M
(b) 2.O x 10-13M
(c) 4.0 x 10-13M
(d) 8.0 x 10-13M

Directions (Q. 41 to 60) In the following questions a statement of assertion followed by a statement of reason is given. Choose the correct answer out of the following choice.
(a) Both Assertion and Reason are true and Reason is the correct explanation of Assertion
(b) Both Assertion and Reason are true but Reason is not the correct explanation of Assertion
(c) Assertion is true but Reason is false.
(d) Both Assertion and Reason are false

41. Assertion Neoprene can be further hardened by heating in presence of sulphur.
Reason Neoprene contains allylic double bonds which help in introducing sulphur bridges between different polymer chains.

42.Assertion Deoxyribose, C5H10O4 is not a carbohydrate.
Reason Carbohydrates are hydrates of carbon so compounds which follow Cx(H2O)yformula are carbohydrates.

43. Assertion Aniline does not undergo Friedel-Crafts reaction.
Reason Friedel-Crafts is an electrophilic substitution reaction.

44. Assertion In comparison to ethyl chloride it is difficult to carry out nucleophilic substitution on vinyl chloride.
Reason Vinyl group is electron donating.

45. Assertion Phenol forms 2,4, 6-tribromophenol on treatment with Br2 in carbon disulphide at 273 K
Reason Bromine polarises in carbon disulphide

46. Assertion On cooling, the brown colour of nitrogen dioxide disappears.
Reason On cooling, NO2 undergoes dimerisation resulting in the pairing of odd electrons of NO2

47. Assertion Na+ and Al3+ are isoelectronic but the magnitude of ionic radius of Al3+ is less than that of Na+
Reason The magnitude of effective nuclear charge of the outer shell electrons in Al3- is greater than that in Na+

48. Assertion CpCv = R, for an ideal gas.
Reason R is the work done when temperature of one mole of an ideal gas is increased by 1.

49. Assertion On addition of NH4Cl to NH2OH solution. pH decreases but remains greater than 7.
Reason Addition of NH+ ion decreases ionisation of NH40H thus [OH] .1 is decreased. hence pH decreases.

50. Assertion The mobility of sodium ion is lower than that of potassium ion.
Reason The ionic mobilities depend on the effective radius of the ion.

51. Assertion On adding zinc pieces to aqueous FeCl3 solution, colour changes from deep yellow to light green.
Reason Aqueous FeCl3 is acidic and on adding Zn, nascent hydrogen is produced which reduces deep yellow FeCl3solution to light green FeCl3 solution.

52. Assertion p-chlorobenzoic acid is stronger acid than benzoic acid.
Reason Chlorine has electron donating resonance (+ R) effect.

53. Assertion A free radical is paramagnetic species.
Reason A free radical is formed in homolytic fission of covalent bond.

54. Assertion Addition of one equivalent of HCl to 1,3-butadiene at 80C gives
3-chloro-1-butene as major product.
Reason 3-chlorod-butene is a kinetically controlled product.

55 .Assertion Semiconductors are solids with conductivities in the intermediate
range from 10-6 104 ohm-1m-1

56. Assertion When methanol is added to water boiling point of water increases.
Reason When a volatile solute is added to a volatile solvent, elevation in boiling
point is observed.

57. Assertion The Daniell cell becomes dead after some time.
Reason Oxidation potential of zinc anode decreases and that of copper increases

58. Assertion The highest oxidation state of Os is + 8.
Reason Osmium is a 5 d-block element:

59. Assertion Toxic metal ions are removed by the chelating ligands.
Reason Chelate complexes lead to be more stable.

60Assertion Formic acid reduces. Tollens reagent.
Reason Compounds containing CHO group reduce ‘Pollens reagent.