AIPMT 2008 · Chemistry

AIPMT 2008 Chemistry Questions with Solutions

The AIPMT 2008 paper had 45 Chemistry questions from 19 chapters.

Equilibrium had the most questions (6), followed by Organic Chemistry: Some Basic Principles and Techniques and Solid State with 4 each.

4 questions below have the answer and explanation free; the other 41 are in Premium.

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Chemistry questions: 45
Chapters covered: 19
Solved free here: 4 of 45
Easy / Medium / Hard: 6 / 24 / 15

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Chapter-wise: AIPMT 2008 Chemistry

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All 45 AIPMT 2008 Chemistry questions

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Question 1 (AIPMT 2008, Q48)
Solid StateMedium
If the lattice parameter for a crystalline structure is 3.6 Å, then the atomic radius in fcc crystal is
1. Option A: 1.27 Å
2. Option B: 1.81 Å
3. Option C: 2.10 Å
4. Option D: 2.92 Å
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Question 2 (AIPMT 2008, Q53)
EquilibriumMedium
The value of equilibrium constant for the reaction $HI(g) ⇌ 1/2 H₂(g) + 1/2 I₂ (g)$ is 8.0. The equilibrium constant of the reaction $H₂(g) + I₂ (g) ⇌ 2HI(g)$ will be
1. Option A: 1/8
2. Option B: 1/16
3. Option C: 1/64
4. Option D: 16
The answer and explanation for this question are in NEET MIND Premium.
Question 3 (AIPMT 2008, Q54)
Solid StateMedium
If 'a' stands for the edge length of the cubic systems: simple cubic, body centred cubic and face centred cubic, then the ratio of radii of the spheres in these systems will be respectively
1. Option A: 1a : √3a : √2a
2. Option B: (1/2)a : (√3/4)a : (1/(2√2))a
3. Option C: (1/2)a : √3a : (1/√2)a
4. Option D: (1/2)a : (√3/2)a : (√2/2)a
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Question 4 (AIPMT 2008, Q55)
ElectrochemistryEasy
Kohlrausch's law states that at
1. Option A: Infinite dilution, each ion makes definite contribution to equivalent conductance of an electrolyte, whatever be the nature of the other ion of the electrolyte
2. Option B: Finite dilution, each ion makes definite contribution to equivalent conductance of an electrolyte, whatever be the nature of the other ion of the electrolyte
3. Option C: Infinite dilution, each ion makes definite contribution to equivalent conductance of an electrolyte depending on the nature of the other ion of the electrolyte
4. Option D: Infinite dilution, each ion makes definite contribution to conductance of an electrolyte whatever be the nature of the other ion of the electrolyte
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Question 5 (AIPMT 2008, Q57)
ThermodynamicsMedium
Which of the following are not state functions? (I) q + w (II) q (III) w (IV) H − TS
1. Option A: (II) and (III)
2. Option B: (I) and (IV)
3. Option C: (II), (III) and (IV)
4. Option D: (I), (II) and (III)
The answer and explanation for this question are in NEET MIND Premium.
Question 6 (AIPMT 2008, Q58)
Chemical KineticsHard
The bromination of acetone that occurs in acid solution is represented by the equation: $CH₃COCH₃(aq) + Br₂(aq) → CH₃COCH₂Br(aq) + H⁺(aq) + Br⁻(aq)$ These kinetic data were obtained for given reaction concentrations Based on these data, the rate equation is
1. Option A: Rate = k[CH₃COCH₃][Br₂][H⁺]
2. Option B: Rate = k[CH₃COCH₃][H⁺]
3. Option C: Rate = k[CH₂=COCH₃][Br₂]
4. Option D: Rate = k[CH₃COCH₃][Br₂][H⁺]²
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Question 7 (AIPMT 2008, Q59)
HydrocarbonsEasy
What volume of oxygen gas (O₂) measured at 0°C and 1 atm is needed to burn completely 1 L of propane gas (C₃H₈) measured under the same conditions?
1. Option A: 10 L
2. Option B: 7 L
3. Option C: 6 L
4. Option D: 5 L
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Question 8 (AIPMT 2008, Q60)
ThermodynamicsMedium
Bond dissociation enthalpy of H₂, Cl₂ and HCl are 434, 242 and 431 kJ mol⁻¹ respectively. Enthalpy of formation of HCl is
1. Option A: 245 kJ mol⁻¹
2. Option B: 93 kJ mol⁻¹
3. Option C: -245 kJ mol⁻¹
4. Option D: -93 kJ mol⁻¹
The answer and explanation for this question are in NEET MIND Premium.
Question 9 (AIPMT 2008, Q61)
Solid StateMedium
Which of the following statements is not correct?
1. Option A: The number of Bravais lattices in which a crystal can be categorized is 14
2. Option B: The fraction of the total volume occupied by the atoms in a primitive cell is 0.48
3. Option C: Molecular solids are generally volatile
4. Option D: The number of carbon atoms in a unit cell of diamond is 4
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Question 10 (AIPMT 2008, Q62)
EquilibriumMedium
Equal volumes of three acid solutions of pH 3, 4 and 5 are mixed in a vessel. What will be the H⁺ ion concentration in the mixture?
1. Option A: 1.11 × 10⁻³ M
2. Option B: 1.11 × 10⁻⁴ M
3. Option C: 3.7 × 10⁻⁴ M
4. Option D: 3.7 × 10⁻³ M
The answer and explanation for this question are in NEET MIND Premium.
Question 11 (AIPMT 2008, Q63)
EquilibriumHard
The values of Kₚ₁ and Kₚ₂ for the reactions $X ⇌ Y + Z .........(1)$ $A ⇌ 2B .............(2)$ are in the ratio 9 : 1. If the degree of dissociation of X and A are equal, then the total pressures at equilibrium for reactions (1) and (2) are in the ratio
1. Option A: 1 : 1
2. Option B: 3 : 1
3. Option C: 1 : 9
4. Option D: 36 : 1
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Question 12 (AIPMT 2008, Q64)
EquilibriumMedium
If the concentration of OH⁻ ions in the reaction $Fe(OH)₃(s) ⇌ Fe³⁺(aq) + 3OH⁻(aq)$ is decreased by 1/4 times, then equilibrium concentration of Fe³⁺ will increase by
1. Option A: 4 times
2. Option B: 8 times
3. Option C: 16 times
4. Option D: 64 times
The answer and explanation for this question are in NEET MIND Premium.
Question 13 (AIPMT 2008, Q65)
ThermodynamicsMedium
For the gas phase reaction, PCl₅(g) ⇌ PCl₃(g) + Cl₂(g) which of the following conditions is correct?
1. Option A: ΔH > 0 and ΔS < 0
2. Option B: ΔH = 0 and ΔS < 0
3. Option C: ΔH > 0 and ΔS > 0
4. Option D: ΔH < 0 and ΔS < 0
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Question 14 (AIPMT 2008, Q66)
Chemical KineticsHard
The rate constants k₁ and k₂ for two different reactions are 10¹⁶ · e⁻²⁰⁰⁰ᐟᵀ and 10¹⁵ · e⁻¹⁰⁰⁰ᐟᵀ respectively. The temperature at which k₁ = k₂ is
1. Option A: 1000/2.303 K
2. Option B: 1000 K
3. Option C: 2000/2.303 K
4. Option D: 2000 K
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Question 15 (AIPMT 2008, Q67)
ElectrochemistryHard
Standard free energies of formation (in kJ mol⁻¹) at 298 K are -237.2, -394.4 and -8.2 for H₂O(l), CO₂(g) and pentane(g) respectively. The value of E°cell for the pentane-oxygen cell is
1. Option A: 0.0968 V
2. Option B: 1.968 V
3. Option C: 2.0968 V
4. Option D: 1.0968 V
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Question 16 (AIPMT 2008, Q68)
EquilibriumHard
The dissociation equilibrium of a gas AB₂ can be represented as: 2AB₂(g) ⇌ 2AB(g) + B₂(g) The degree of dissociation is x and is small compared to 1. The expression relating the degree of dissociation (x) with equilibrium constant Kp and total pressure P is
1. Option A: (Kₚ/P)
2. Option B: (2Kₚ/P)
3. Option C: (2Kₚ/P)¹ᐟ³
4. Option D: (2Kₚ/P)¹ᐟ²
The answer and explanation for this question are in NEET MIND Premium.
Question 17 (AIPMT 2008, Q69)
SolutionsMedium
The sequence of ionic mobility in aqueous solution is
1. Option A: Na⁺ > K⁺ > Rb⁺ > Cs⁺
2. Option B: K⁺ > Na⁺ > Rb⁺ > Cs⁺
3. Option C: Cs⁺ > Rb⁺ > K⁺ > Na⁺
4. Option D: Rb⁺ > K⁺ > Cs⁺ > Na⁺
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Question 18 (AIPMT 2008, Q70)
Solid StateEasy
Percentage of free space in a body centred cubic unit cell is
1. Option A: 28%
2. Option B: 30%
3. Option C: 32%
4. Option D: 34%
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Question 19 (AIPMT 2008, Q71)
Classification of Elements and Periodicity in PropertiesHard
The correct order of decreasing second ionisation enthalpy of Ti (22), V (23), Cr (24) and Mn (25) is
1. Option A: Ti > V > Cr > Mn
2. Option B: Cr > Mn > V > Ti
3. Option C: V > Mn > Cr > Ti
4. Option D: Mn > Cr > Ti > V
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Question 20 (AIPMT 2008, Q72)
Some Basic Concepts of ChemistryMedium
How many moles of lead(II) chloride will be formed from a reaction between 6.5 g of PbO and 3.2 g of HCl?
1. Option A: 0.029
2. Option B: 0.044
3. Option C: 0.333
4. Option D: 0.011
The answer and explanation for this question are in NEET MIND Premium.
Question 21 (AIPMT 2008, Q73)
Coordination CompoundsHard
Which of the following complexes exhibits the highest paramagnetic behaviour? (Where gly = glycine, en = ethylenediamine and bpy = bipyridyl moieties. Atomic numbers: Ti = 22, V = 23, Fe = 26, Co = 27)
1. Option A: [Ti(NH₃)₆]³⁺
2. Option B: [V(gly)₂(OH)₂(NH₃)₂]⁺
3. Option C: [Fe(en)(bpy)(NH₃)₂]²⁺
4. Option D: [Co(OX)₂(OH)₂]⁻
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Question 22 (AIPMT 2008, Q74)
Some Basic Concepts of ChemistryEasy
Volume occupied by one molecule of water (density = 1 g cm⁻³) is
1. Option A: 5.5 × 10⁻²³ cm³
2. Option B: 9.0 × 10⁻²³ cm³
3. Option C: 6.023 × 10⁻²³ cm³
4. Option D: 3.0 × 10⁻²³ cm³
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Question 23 (AIPMT 2008, Q75)
Redox ReactionsHard
Number of moles of MnO₄⁻ required to oxidize one mole of ferrous oxalate completely in acidic medium will be
1. Option A: 0.2 moles
2. Option B: 0.6 moles
3. Option C: 0.4 moles
4. Option D: 7.5 moles
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Correct answer: (B) 0.6 moles
Explanation
Ferrous oxalate contains Fe²⁺ and C₂O₄²⁻. Oxidation half-reaction: FeC₂O₄ → Fe³⁺ + 2CO₂ + 3e⁻ Reduction half-reaction in acidic medium: MnO₄⁻ + 8H⁺ + 5e⁻ → Mn²⁺ + 4H₂O Balancing electrons: 5(FeC₂O₄ → Fe³⁺ + 2CO₂ + 3e⁻) 3(MnO₄⁻ + 8H⁺ + 5e⁻ → Mn²⁺ + 4H₂O) Overall reaction: 5FeC₂O₄ + 3MnO₄⁻ + 24H⁺ → 5Fe³⁺ + 10CO₂ + 3Mn²⁺ + 12H₂O Thus, 5 mol FeC₂O₄ require 3 mol MnO₄⁻ Therefore, 1 mol FeC₂O₄ requires 3/5 mol MnO₄⁻ = 0.6 mol. Hence, the correct answer is 0.6 moles.
Question 24 (AIPMT 2008, Q76)
Coordination CompoundsHard
On the basis of the following E° values, the strongest oxidizing agent is $[Fe(CN)₆]⁴⁻ → [Fe(CN)₆]³⁻ + e⁻¹ ; E° = −0.35 V$ $Fe²⁺ → Fe³⁺ + e⁻¹; E° = −0.77 V$
1. Option A: [Fe(CN)₆]³⁻
2. Option B: [Fe(CN)₆]⁴⁻
3. Option C: Fe²⁺
4. Option D: Fe³⁺
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Question 25 (AIPMT 2008, Q77)
HydrogenMedium
The alkali metals form salt-like hydrides by direct synthesis at elevated temperature. The thermal stability of these hydrides decreases in which of the following orders?
1. Option A: LiH > NaH > KH > RbH > CsH
2. Option B: CsH > RbH > KH > NaH > LiH
3. Option C: KH > NaH > LiH > CsH > RbH
4. Option D: NaH > LiH > KH > RbH > CsH
Show answer & explanationHide answer & explanation
Correct answer: (A) LiH > NaH > KH > RbH > CsH
Explanation
Alkali metal hydrides are ionic in nature. Their thermal stability depends mainly on lattice enthalpy. As the size of the alkali metal cation increases down the group, lattice enthalpy decreases, leading to lower thermal stability. Therefore, the decreasing order of thermal stability is: LiH > NaH > KH > RbH > CsH. Hence, the correct answer is option (A).
Question 26 (AIPMT 2008, Q78)
Classification of Elements and Periodicity in PropertiesMedium
Which one of the following arrangements does not give the correct picture of the trends indicated against it?
1. Option A: F₂ > Cl₂ > Br₂ > I₂ : Electronegativity
2. Option B: F₂ > Cl₂ > Br₂ > I₂ : Oxidizing power
3. Option C: F₂ > Cl₂ > Br₂ > I₂ : Electron gain enthalpy
4. Option D: F₂ > Cl₂ > Br₂ > I₂ : Bond dissociation energy
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Question 27 (AIPMT 2008, Q80)
Coordination CompoundsHard
In which of the following coordination entities is the magnitude of Δo (CFSE in octahedral field) maximum? (Atomic number of Co = 27)
1. Option A: [Co(C₂O₄)₃]³⁻
2. Option B: [Co(H₂O)₆]³⁺
3. Option C: [Co(NH₃)₆]³⁺
4. Option D: [Co(CN)₆]³⁻
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Question 28 (AIPMT 2008, Q81)
Chemical Bonding and Molecular StructureMedium
The angular shape of ozone molecule (O₃) consists of
1. Option A: 2 sigma and 1 pi bond
2. Option B: 1 sigma and 2 pi bonds
3. Option C: 2 sigma and 2 pi bonds
4. Option D: 1 sigma and 1 pi bond
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Question 29 (AIPMT 2008, Q82)
Chemical Bonding and Molecular StructureMedium
The correct order of increasing bond angles in the following triatomic species is
1. Option A: NO₂⁺ < NO₂⁻ < NO₂
2. Option B: NO₂⁻ < NO₂⁺ < NO₂
3. Option C: NO₂⁻ < NO₂ < NO₂⁺
4. Option D: NO₂⁺ < NO₂ < NO₂⁻
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Question 30 (AIPMT 2008, Q83)
Chemical Bonding and Molecular StructureHard
Four diatomic species are listed below in different sequences. Which of these presents the correct order of their increasing bond order?
1. Option A: He₂⁺ < O₂⁻ < NO < C₂²⁻
2. Option B: O₂⁻ < NO < C₂²⁻ < He₂⁺
3. Option C: NO < C₂²⁻ < O₂⁻ < He₂⁺
4. Option D: C₂²⁻ < He₂⁺ < NO < O₂⁻
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Question 31 (AIPMT 2008, Q84)
EquilibriumMedium
Equimolar solutions of the following were prepared in water separately. Which one of the solutions will record the highest pH?
1. Option A: CaCl₂
2. Option B: SrCl₂
3. Option C: BaCl₂
4. Option D: MgCl₂
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Question 32 (AIPMT 2008, Q85)
Organic Chemistry: Some Basic Principles and TechniquesMedium
In the hydrocarbon shown below, the state of hybridization of carbons 1, 3 and 5 are in the following sequence.
1. Option A: sp³, sp², sp
2. Option B: sp², sp, sp³
3. Option C: sp, sp³, sp²
4. Option D: sp, sp², sp³
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Question 33 (AIPMT 2008, Q86)
Environmental ChemistryEasy
Green chemistry means such reactions which
1. Option A: Study the reactions in plants
2. Option B: Produce colour during reactions
3. Option C: Reduce the use and production of hazardous chemicals
4. Option D: Are related to the depletion of ozone layer
Show answer & explanationHide answer & explanation
Correct answer: (C) Reduce the use and production of hazardous chemicals
Explanation
Green chemistry is the design of chemical products and processes that reduce or eliminate the use and generation of hazardous substances. Therefore option (C) is correct.
Question 34 (AIPMT 2008, Q87)
Aldehydes, Ketones and Carboxylic AcidsMedium
A strong base can abstract an α-hydrogen from
1. Option A: Alkane
2. Option B: Alkene
3. Option C: Amine
4. Option D: Ketone
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Question 35 (AIPMT 2008, Q88)
Organic Chemistry: Some Basic Principles and TechniquesMedium
How many stereoisomers does the molecule CH₃CH=CHCH₂CHBrCH₃ have?
1. Option A: 2
2. Option B: 4
3. Option C: 6
4. Option D: 8
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Question 36 (AIPMT 2008, Q89)
Organic Chemistry: Some Basic Principles and TechniquesHard
The stability of carbanions in the following species is in the order of
1. Option A: a > c > b > d
2. Option B: a > b > c > d
3. Option C: b > c > d > a
4. Option D: d > b > c > a
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Question 37 (AIPMT 2008, Q90)
Aldehydes, Ketones and Carboxylic AcidsMedium
The relative reactivities of acyl compounds towards nucleophilic substitution are in the order of
1. Option A: Acyl chloride > Ester > Acid anhydride > Amide
2. Option B: Acyl chloride > Acid anhydride > Ester > Amide
3. Option C: Ester > Acyl chloride > Amide > Acid anhydride
4. Option D: Acid anhydride > Amide > Ester > Acyl chloride
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Question 38 (AIPMT 2008, Q91)
Organic Chemistry: Some Basic Principles and TechniquesMedium
The basic strength of the following carbanions a, b and c is in the order of
1. Option A: a > b > c
2. Option B: b > a > c
3. Option C: c > b > a
4. Option D: a > c > b
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Question 39 (AIPMT 2008, Q92)
HydrocarbonsHard
A (predominantly) is
1. Option A: Structure (1)
2. Option B: Structure (2)
3. Option C: Structure (3)
4. Option D: Structure (4)
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Question 40 (AIPMT 2008, Q94)
HydrocarbonsMedium
Which one of the following is most reactive towards electrophilic attack?
1. Option A: Option (1)
2. Option B: Option (2)
3. Option C: Option (3)
4. Option D: Option (4)
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Question 41 (AIPMT 2008, Q95)
Some Basic Concepts of ChemistryMedium
An organic compound contains carbon, hydrogen and oxygen. Its elemental analysis gave C = 38.71% and H = 9.67%. The empirical formula of the compound would be
1. Option A: CH₄O
2. Option B: CH₃O
3. Option C: CH₂O
4. Option D: CHO
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Question 42 (AIPMT 2008, Q96)
Haloalkanes and HaloarenesMedium
In a S $_N$ 2 substitution reaction of the type which one of the following has the highest relative rate?
1. Option A: Option (1)
2. Option B: Option (2)
3. Option C: Option (3)
4. Option D: Option (4)
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Question 43 (AIPMT 2008, Q97)
Aldehydes, Ketones and Carboxylic AcidsHard
Acetophenone when reacted with a base, C₂H₅ONa, yields a stable compound which has the structure?
1. Option A: Structure (1)
2. Option B: Structure (2)
3. Option C: Structure (3)
4. Option D: Structure (4)
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Question 44 (AIPMT 2008, Q98)
AminesHard
In a reaction of aniline, a coloured product C was obtained.
1. Option A: Option (1)
2. Option B: Option (2)
3. Option C: Option (3)
4. Option D: Option (4)
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Question 45 (AIPMT 2008, Q99)
PolymersEasy
Which of the following statements is not true?
1. Option A: Natural rubber is a 1,4-polymer of isoprene
2. Option B: In vulcanization, the formation of sulphur bridges between different chains makes rubber harder and stronger
3. Option C: Natural rubber has the trans-configuration at every double bond
4. Option D: Buna-S is a copolymer of butadiene and styrene
Show answer & explanationHide answer & explanation
Correct answer: (C) Natural rubber has the trans-configuration at every double bond
Explanation
Natural rubber is cis-1,4-polyisoprene. The trans form of polyisoprene is known as gutta-percha. Therefore the statement that natural rubber has trans configuration at every double bond is incorrect. Hence option (C) is correct.

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