AIPMT 2011 · Chemistry

AIPMT 2011 Chemistry Questions with Solutions

The AIPMT 2011 paper had 28 Chemistry questions from 17 chapters.

Chemical Bonding and Molecular Structure, Chemical Kinetics and The d- and f-Block Elements had the most questions (3 each).

1 question below has the answer and explanation free; the other 27 are in Premium.

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Chemistry questions: 28
Chapters covered: 17
Solved free here: 1 of 28
Easy / Medium / Hard: 5 / 20 / 3

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Chapter-wise: AIPMT 2011 Chemistry

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All 28 AIPMT 2011 Chemistry questions

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Question 1 (AIPMT 2011, Q3)
Some Basic Concepts of ChemistryEasy
Which has the maximum number of molecules among the following?
1. Option A: 44 g CO $_2$
2. Option B: 48 g O $_3$
3. Option C: 8 g H $_2$
4. Option D: 64 g SO $_2$
The answer and explanation for this question are in NEET MIND Premium.
Question 2 (AIPMT 2011, Q4)
Chemical KineticsMedium
The half life of a substance in a certain enzyme-catalysed reaction is 138 s. The time required for the concentration of the substance to fall from 1.28 mg L $^{-1}$ to 0.04 mg L $^{-1}$ is:
1. Option A: 414 s
2. Option B: 552 s
3. Option C: 690 s
4. Option D: 276 s
The answer and explanation for this question are in NEET MIND Premium.
Question 3 (AIPMT 2011, Q5)
Haloalkanes and HaloarenesMedium
Which of the following compounds undergoes nucleophilic substitution reaction most easily?
1. Option A: Option (1)
2. Option B: Option (2)
3. Option C: Option (3)
4. Option D: Option (4)
The answer and explanation for this question are in NEET MIND Premium.
Question 4 (AIPMT 2011, Q6)
The d- and f-Block ElementsEasy
Which of the following statements is incorrect?
1. Option A: Pure sodium metal dissolves in liquid ammonia to give blue solution
2. Option B: NaOH reacts with glass to give sodium silicate
3. Option C: Aluminium reacts with excess NaOH to give Al(OH) $_3$
4. Option D: NaHCO $_3$ on heating gives Na $_2$ CO $_3$
The answer and explanation for this question are in NEET MIND Premium.
Question 5 (AIPMT 2011, Q7)
SolutionsMedium
A 0.1 molal aqueous solution of a weak acid is 30% ionised. If $K_f$ for water is $1.86^\circ$ C/m, the freezing point of the solution will be:
1. Option A: $-0.18^\circ C$
2. Option B: $-0.54^\circ C$
3. Option C: $-0.36^\circ C$
4. Option D: $-0.24^\circ C$
The answer and explanation for this question are in NEET MIND Premium.
Question 6 (AIPMT 2011, Q8)
Chemical KineticsMedium
The rate of the reaction $2N_2O_5 \rightarrow 4NO_2 + O_2$ can be written in three ways: $-\frac{d[N_2O_5]}{dt} = k[N_2O_5]$ $\frac{d[N_2O]}{dt} = k'[N_2O_5]$ $\frac{d[O_2]}{dt} = k''[N_2O_5]$ The relationship between k and k' and between k and k'' are:
1. Option A: $k' = 2k$ ; $k' = k$
2. Option B: $k' = 2k$ ; $k' = \dfrac{k}{2}$
3. Option C: $k' = 2k$ ; $k'' = 2k$
4. Option D: $k' = k$ ; $k'' = k$
The answer and explanation for this question are in NEET MIND Premium.
Question 7 (AIPMT 2011, Q9)
Coordination CompoundsMedium
Which of the following carbonyls will have the strongest C $-$ O bond?
1. Option A: Mn(CO) $_6^+$
2. Option B: Cr(CO) $_6$
3. Option C: V(CO) $_6^-$
4. Option D: Fe(CO) $_5$
The answer and explanation for this question are in NEET MIND Premium.
Question 8 (AIPMT 2011, Q10)
Aldehydes, Ketones and Carboxylic AcidsMedium
The order of reactivity of phenyl magnesium bromide (PhMgBr) with the following compounds is:
1. Option A: III > II > I
2. Option B: II > I > III
3. Option C: I > III > II
4. Option D: I > II > III
The answer and explanation for this question are in NEET MIND Premium.
Question 9 (AIPMT 2011, Q11)
HydrocarbonsMedium
The IUPAC name of the following compound is:
1. Option A: trans-2-chloro-3-iodo-2-pentene
2. Option B: cis-3-iodo-4-chloro-3-pentene
3. Option C: trans-3-iodo-4-chloro-3-pentene
4. Option D: cis-2-chloro-3-iodo-2-pentene
The answer and explanation for this question are in NEET MIND Premium.
Question 10 (AIPMT 2011, Q12)
Structure of AtomMedium
According to the Bohr Theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon?
1. Option A: $n = 6$ to $n = 1$
2. Option B: $n = 5$ to $n = 4$
3. Option C: $n = 6$ to $n = 5$
4. Option D: $n = 5$ to $n = 3$
The answer and explanation for this question are in NEET MIND Premium.
Question 11 (AIPMT 2011, Q13)
Chemical Bonding and Molecular StructureMedium
A solid compound XY has NaCl structure. If the radius of the cation is 100 pm, the radius of the anion $(Y^-)$ will be:
1. Option A: 275.1 pm
2. Option B: 322.5 pm
3. Option C: 241.5 pm
4. Option D: 165.7 pm
The answer and explanation for this question are in NEET MIND Premium.
Question 12 (AIPMT 2011, Q14)
ThermodynamicsMedium
Consider the following processes:
1. Option A: $525\ \text{kJ mol}^{-1}$
2. Option B: $-175\ \text{kJ mol}^{-1}$
3. Option C: $-325\ \text{kJ mol}^{-1}$
4. Option D: $325\ \text{kJ mol}^{-1}$
The answer and explanation for this question are in NEET MIND Premium.
Question 13 (AIPMT 2011, Q15)
Alcohols, Phenols and EthersHard
Match the compounds given in List-I with List-II and select the suitable option using the code given below:
1. Option A: Option (1)
2. Option B: Option (2)
3. Option C: Option (3)
4. Option D: Option (4)
The answer and explanation for this question are in NEET MIND Premium.
Question 14 (AIPMT 2011, Q16)
AminesMedium
Which of the following compounds is most basic?
1. Option A: Option (1)
2. Option B: Option (2)
3. Option C: Option (3)
4. Option D: Option (4)
The answer and explanation for this question are in NEET MIND Premium.
Question 15 (AIPMT 2011, Q17)
Chemical Bonding and Molecular StructureMedium
Which of the following structures is the most preferred and hence of lowest energy for $SO_3$ ?
1. Option A: Structure (1)
2. Option B: Structure (2)
3. Option C: Structure (3)
4. Option D: Structure (4)
The answer and explanation for this question are in NEET MIND Premium.
Question 16 (AIPMT 2011, Q18)
ElectrochemistryMedium
A solution contains $Fe^{2+}$ , $Fe^{3+}$ and $I^-$ ions. This solution was treated with iodine at $35^\circ C$ . $E^\circ$ for $Fe^{3+}/Fe^{2+}$ is $+0.77\,V$ and $E^\circ$ for $I_2/2I^-$ = 0.536 V. The favourable redox reaction is:
1. Option A: $I_2$ will be reduced to $I^-$
2. Option B: There will be no redox reaction
3. Option C: $I^-$ will be oxidised to $I_2$
4. Option D: $Fe^{2+}$ will be oxidised to $Fe^{3+}$
The answer and explanation for this question are in NEET MIND Premium.
Question 17 (AIPMT 2011, Q19)
Classification of Elements and Periodicity in PropertiesMedium
What is the value of electron gain enthalpy of $Na^+$ if the ionisation enthalpy of Na is $5.1\,eV$ ?
1. Option A: $-5.1\,eV$
2. Option B: $-10.2\,eV$
3. Option C: $+2.55\,eV$
4. Option D: $+10.2\,eV$
The answer and explanation for this question are in NEET MIND Premium.
Question 18 (AIPMT 2011, Q20)
Chemical KineticsEasy
The unit of rate constant for a zero order reaction is:
1. Option A: $mol\,L^{-1}\,s^{-1}$
2. Option B: $L\,mol^{-1}\,s^{-1}$
3. Option C: $L^2\,mol^{-2}\,s^{-1}$
4. Option D: $s^{-1}$
The answer and explanation for this question are in NEET MIND Premium.
Question 19 (AIPMT 2011, Q21)
EquilibriumHard
In qualitative analysis, the metals of Group I can be separated from other ions by precipitating them as chloride salts. A solution initially contains $Ag^+$ and $Pb^{2+}$ at a concentration of $0.10\,M$ . Aqueous HCl is added to this solution until the $Cl^-$ concentration is $0.10\,M$ . What will be the concentrations of $Ag^+$ and $Pb^{2+}$ at equilibrium? Given: $K_{sp}(AgCl)=1.8\times10^{-10}$ $K_{sp}(PbCl_2)=1.7\times10^{-5}$
1. Option A: $[Ag^+] = 1.8\times10^{-7}\,M;\ [Pb^{2+}] = 1.7\times10^{-6}\,M$
2. Option B: $[Ag^+] = 1.8\times10^{-11}\,M;\ [Pb^{2+}] = 8.5\times10^{-5}\,M$
3. Option C: $[Ag^+] = 1.8\times10^{-9}\,M;\ [Pb^{2+}] = 1.7\times10^{-3}\,M$
4. Option D: $[Ag^+] = 1.8\times10^{-11}\,M;\ [Pb^{2+}] = 8.5\times10^{-4}\,M$
The answer and explanation for this question are in NEET MIND Premium.
Question 20 (AIPMT 2011, Q22)
ThermodynamicsEasy
A bubble of air is underwater at temperature $15^\circ C$ and pressure $1.5\,bar$ . If the bubble rises to the surface where the temperature is $25^\circ C$ and the pressure is $1.0\,bar$ , what will happen to the volume of the bubble?
1. Option A: Volume will become greater by a factor of $1.6$
2. Option B: Volume will become greater by a factor of $1.1$
3. Option C: Volume will become smaller by a factor of $0.70$
4. Option D: Volume will become greater by a factor of $2.5$
The answer and explanation for this question are in NEET MIND Premium.
Question 21 (AIPMT 2011, Q23)
The d- and f-Block ElementsMedium
Match List-I with List-II for the compositions of substances and select the correct answer using the code given below:
1. Option A: Option (1)
2. Option B: Option (2)
3. Option C: Option (3)
4. Option D: Option (4)
The answer and explanation for this question are in NEET MIND Premium.
Question 22 (AIPMT 2011, Q24)
Chemical Bonding and Molecular StructureMedium
The pairs of species of oxygen and their magnetic behaviours are noted below. Which of the following presents the correct description?
1. Option A: O $_2^-$ , O $_2^{2-}$ — Both diamagnetic
2. Option B: O $_2^+$ , O $_2^{2-}$ — Both paramagnetic
3. Option C: O $_2^+$ , O $_2$ — Both paramagnetic
4. Option D: O $_2$ , O $_2^{2-}$ — Both paramagnetic
The answer and explanation for this question are in NEET MIND Premium.
Question 23 (AIPMT 2011, Q25)
Haloalkanes and HaloarenesMedium
Consider the reactions: The mechanisms of reactions (i) and (ii) are respectively:
1. Option A: S $_N1$ and S $_N2$
2. Option B: S $_N1$ and S $_N1$
3. Option C: S $_N2$ and S $_N2$
4. Option D: S $_N2$ and S $_N1$
The answer and explanation for this question are in NEET MIND Premium.
Question 24 (AIPMT 2011, Q26)
Coordination CompoundsHard
Which of the following complex compounds will exhibit highest paramagnetic behaviour? (Atomic numbers: Ti = 22, Cr = 24, Co = 27, Zn = 30)
1. Option A: [Ti(NH $_3$ ) $_6$ ] $^{3+}$
2. Option B: [Cr(NH $_3$ ) $_6$ ] $^{3+}$
3. Option C: [Co(NH $_3$ ) $_6$ ] $^{3+}$
4. Option D: [Zn(NH $_3$ ) $_6$ ] $^{2+}$
The answer and explanation for this question are in NEET MIND Premium.
Question 25 (AIPMT 2011, Q27)
SolutionsMedium
200 mL of an aqueous solution of a protein contains its 1.26 g. The osmotic pressure of this solution at 300 K is found to be $2.57 \times 10^{-3}$ bar. The molar mass of protein will be (R = 0.083 L bar mol $^{-1}$ K $^{-1}$ ):
1. Option A: 51022 g mol $^{-1}$
2. Option B: 122044 g mol $^{-1}$
3. Option C: 31011 g mol $^{-1}$
4. Option D: 61038 g mol $^{-1}$
The answer and explanation for this question are in NEET MIND Premium.
Question 26 (AIPMT 2011, Q28)
The d- and f-Block ElementsEasy
Which of the following oxide is amphoteric?
1. Option A: SnO $_2$
2. Option B: CaO
3. Option C: SiO $_2$
4. Option D: CO $_2$
The answer and explanation for this question are in NEET MIND Premium.
Question 27 (AIPMT 2011, Q29)
General Principles And Processes Of Isolation Of ElementsMedium
The following reactions take place in the blast furnace in the preparation of impure iron. Identify the reaction pertaining to the formation of the slag.
1. Option A: (1) $Fe_2O_3(s) + 3CO(g) \rightarrow 2Fe(l) + 3CO_2(g)$
2. Option B: (2) $CaCO_3(s) \rightarrow CaO(s) + CO_2(g)$
3. Option C: (3) $CaO(s) + SiO_2(s) \rightarrow CaSiO_3(s)$
4. Option D: (4) $2C(s) + O_2(g) \rightarrow 2CO(g)$
Show answer & explanationHide answer & explanation
Correct answer: (C) (3) $CaO(s) + SiO_2(s) \rightarrow CaSiO_3(s)$
Explanation
Slag is formed when basic flux CaO reacts with acidic impurity SiO $_2$ to form calcium silicate: $CaO + SiO_2 \rightarrow CaSiO_3$
Question 28 (AIPMT 2011, Q30)
AminesMedium
An organic compound 'A' on treatment with NH $_3$ gives 'B' which on heating gives 'C'. 'C' when treated with Br $_2$ in the presence of KOH produces ethylamine. Compound 'A' is:
1. Option A: CH $_3$ COOH
2. Option B: CH $_3$ CH $_2$ CH $_2$ COOH
3. Option C: CH $_3$ CH(CH $_3$ )COOH
4. Option D: CH $_3$ CH $_2$ COOH
The answer and explanation for this question are in NEET MIND Premium.

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