AIPMT 2007 Prelims

178 Questions • 178 Minutes • 2007

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Q41
RNA and DNA are chiral molecules, their chirality is due to
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Q42
The Langmuir adsorption isotherm is deduced using the assumption
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Q43
A weak acid, HA, has a Ka of 1.00 × 10⁻⁵. If 0.100 mole of this acid dissolved in one litre of water, the percentage of acid dissociated at equilibrium is closest to
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Q44
The reaction of hydrogen and iodine monochloride is given as: H₂(g) + 2ICl(g) → 2HCl(g) + I₂(g) The reaction is of first order with respect to H₂(g) and ICl(g), following mechanisms were proposed. Mechanism A: H₂(g) + 2ICl(g) → 2HCl(g) + I₂(g) Mechanism B: H₂(g) + ICl(g) → HI(g) ; slow HI(g) + ICl(g) → HCl(g) + I₂(g) ; fast Which of the above mechanism(s) can be consistent with the given information about the reaction?
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Q45
The efficiency of a fuel cell is given by
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Q46
Consider the following reactions: (i) H⁺(aq) + OH⁻(aq) = H₂O(l), ΔH = −X₁ kJ mol⁻¹ (ii) H₂(g) + ½O₂(g) = H₂O(l), ΔH = −X₂ kJ mol⁻¹ (iii) CO₂(g) + H₂(g) = CO(g) + H₂O, ΔH = −X₃ kJ mol⁻¹ (iv) C₂H₂(g) + (5/2)O₂(g) = 2CO₂(g) + H₂O(l), ΔH = −X₄ kJ mol⁻¹ Enthalpy of formation of H₂O(l) is
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Q47
The correct order of increasing thermal stability of K₂CO₃, MgCO₃, CaCO₃ and BeCO₃ is
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Q48
In which of the following pairs, the two species are iso-structure?
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Q49
Which of the following oxidation states are the most characteristic for lead and tin respectively?
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Q50
Which of the following statements, about the advantage of roasting of sulphide ore before reduction is not true?
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Q51
In a first-order reaction A → B, if k is rate constant and initial concentration of the reactant A is 0.5 M, then the half-life is
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Q52
Consider the following compounds. (i) C₆H₅COCl (ii) O₂N–C₆H₄–COCl (para) (iii) H₃C–C₆H₄–COCl (para) (iv) OHC–C₆H₄–COCl (para) The correct decreasing order of their reactivity towards hydrolysis is
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Q53
Predict the product C obtained in the following reaction of butyne-1. CH₃CH₂–C≡CH + HCl → B —HI→ C
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Q54
Concentrated aqueous sulphuric acid is 98% H₂SO₄ by mass and has a density of 1.80 g mL⁻¹. Volume of acid required to make one litre of 0.1 M H₂SO₄ solution is
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Q55
Reduction of aldehydes and ketones into hydrocarbons using zinc amalgam and conc. HCl is called
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Q56
Given that bond energies of H–H and Cl–Cl are 430 kJ mol⁻¹ and 240 kJ mol⁻¹ respectively and ΔHf for HCl is −90 kJ mol⁻¹, bond enthalpy of HCl is
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Q57
Which of the following represents the correct order of the acidity in the given compounds?
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Q58
If there is no rotation of plane polarised light by a compound in a specific solvent, though to be chiral, it may mean that
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Q59
Which of the following is water-soluble?
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Q60
0.5 molal aqueous solution of a weak acid (HX) is 20% ionised. If Kf for water is 1.86 K kg mol⁻¹, the lowering in freezing point of the solution is
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Paper Info
  • Exam: AIPMT Prelims
  • Year: 2007
  • Questions: 178
  • Duration: 178 mins
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