AIPMT 2012 Mains

89 Questions • 89 Minutes • 2012

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Q21
The half life of a radioactive nucleus is 50 days. The time interval (t₂ − t₁) between the time t₂ when 2/3 of it has decayed and the time t₁ when 1/3 of it had decayed is
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Q22
The input resistance of a silicon transistor is 100 Ω. Base current is changed by 40 µA which results in a change in collector current by 2 mA. This transistor is used as a common emitter amplifier with a load resistance of 4 kΩ. The voltage gain of the amplifier is
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Q23
Given that the equilibrium constant for the reaction 2SO₂(g) + O₂(g) ⇌ 2SO₃(g) has a value of 278 at a particular temperature. What is the value of the equilibrium constant for the following reaction at the same temperature? SO₃(g) ⇌ SO₂(g) + (1/2)O₂(g)
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Q24
Given the reaction between 2 gases represented by A₂ and B₂ to give the compound AB(g): A₂(g) + B₂(g) ⇌ 2AB(g). At equilibrium, the concentration of A₂ = 3.0 × 10⁻³ M, of B₂ = 4.2 × 10⁻³ M and of AB = 2.8 × 10⁻³ M. If the reaction takes place in a sealed vessel at 527°C, then the value of Kc will be
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Q25
During change of O₂ to O₂⁻ ion, the electron adds on which one of the following orbitals?
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Q26
Standard reduction potentials of the half reactions are given below: F₂(g) + 2e⁻ → 2F⁻(aq); E° = +2.85 V Cl₂(g) + 2e⁻ → 2Cl⁻(aq); E° = +1.36 V Br₂(l) + 2e⁻ → 2Br⁻(aq); E° = +1.06 V I₂(s) + 2e⁻ → 2I⁻(aq); E° = +0.53 V The strongest oxidising and reducing agents respectively are
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Q27
The orbital angular momentum of a p-electron is given as :
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Q28
Structure of a mixed oxide is cubic close-packed (c.c.p.). The cubic unit cell of mixed oxide is composed of oxide ions. One fourth of the tetrahedral voids are occupied by divalent metal A and the octahedral voids are occupied by a monovalent metal B. The formula of the oxide is
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Q29
Molar conductivities (Λ°m) at infinite dilution of NaCl, HCl and CH₃COONa are 126.4, 425.9 and 91.0 S cm² mol⁻¹ respectively. Λ°m for CH₃COOH will be
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Q30
Equal volumes of two monoatomic gases, A and B, at same temperature and pressure are mixed. The ratio of specific heats (Cp/Cv) of the mixture will be
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Q31
Which one of the following does not correctly represent the correct order of the property indicated against it?
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Q32
A certain gas takes three times as long to effuse out as helium. Its molecular mass will be :
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Q33
Four successive members of the first series of the transition metals are listed below. For which one of them the standard potential E°(M²⁺/M) value has a positive sign?
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Q34
Four diatomic species are listed below. Identify the correct order in which the bond order is increasing in them:
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Q35
Which of the following exhibits only +3 oxidation state?
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Q36
Consider the following reaction: C₆H₅COCl —(H₂, Pd–BaSO₄)→ 'A' The product 'A' is
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Q37
An organic compound C₃H₉N (A), when treated with nitrous acid, gave an alcohol and N₂ gas was evolved. (A) on warming with CHCl₃ and caustic potash gave (C) which on reduction gave isopropylmethylamine. Predict the structure of (A).
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Q38
Which of the following reagents will be able to distinguish between 1-butyne and 2-butyne?
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Q39
Consider the reaction: RCHO + NH₂NH₂ → RCH=N–NH₂. What sort of reaction is it?
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Q40
Which of the following compounds can be used as antifreeze in automobile radiators ?
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Paper Info
  • Exam: AIPMT Mains
  • Year: 2012
  • Questions: 89
  • Duration: 89 mins
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