AIPMT 2005 · Chemistry

AIPMT 2005 Chemistry Questions with Solutions

The AIPMT 2005 paper had 50 Chemistry questions from 25 chapters.

Chemical Bonding and Molecular Structure had the most questions (6), followed by Organic Chemistry: Some Basic Principles and Techniques with 5.

6 questions below have the answer and explanation free; the other 44 are in Premium.

Practise AIPMT 2005 Chemistry free

Chemistry questions: 50
Chapters covered: 25
Solved free here: 6 of 50
Easy / Medium / Hard: 13 / 29 / 8

Difficulty is NEET MIND's own tag for each question.

All 50 AIPMT 2005 Chemistry questions

In paper order. Try each one, then open the answer where it is shown.

Question 1 (AIPMT 2005, Q47)
Solid StateMedium
Copper has face-centered cubic (fcc) lattice with interatomic spacing equal to $2.54\,\text{\AA}$ . The value of lattice constant for this lattice is:
1. Option A: $2.29\,\text{\AA}$
2. Option B: $3.29\,\text{\AA}$
3. Option C: $2.59\,\text{\AA}$
4. Option D: $3.59\,\text{\AA}$
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Question 2 (AIPMT 2005, Q51)
Organic Chemistry: Some Basic Principles and TechniquesEasy
Which amongst the following is the most stable carbocation?
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 3 (AIPMT 2005, Q52)
HydrocarbonsMedium
Products of the following reaction:
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 4 (AIPMT 2005, Q53)
EquilibriumMedium
At $25^\circ C$ , the dissociation constant of a base, $BOH$ , is $1.0 \times 10^{-12}$ . The concentration of hydroxyl ions in $0.01\,M$ aqueous solution of the base would be:
1. Option A: $1.0 \times 10^{-6}\,mol\,L^{-1}$
2. Option B: $1.0 \times 10^{-5}\,mol\,L^{-1}$
3. Option C: $1.0 \times 10^{-8}\,mol\,L^{-1}$
4. Option D: $1.0 \times 10^{-7}\,mol\,L^{-1}$
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Question 5 (AIPMT 2005, Q54)
Organic Chemistry: Some Basic Principles and TechniquesEasy
Which one of the following pairs represents stereoisomerism?
1. Option A: Chain isomerism and rotational isomerism
2. Option B: Structural isomerism and geometric isomerism
3. Option C: Linkage isomerism and geometric isomerism
4. Option D: Optical isomerism and geometric isomerism
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Question 6 (AIPMT 2005, Q55)
AminesMedium
Aniline in a set of reactions yielded a product D. The structure of the product D would be:
1. Option A: $C_6H_5CH_2NH_2$
2. Option B: $C_6H_5NHCH_2CH_3$
3. Option C: $C_6H_5NHOH$
4. Option D: $C_6H_5CH_2OH$
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Question 7 (AIPMT 2005, Q56)
Chemical Bonding and Molecular StructureMedium
The correct order in which the O–O bond length increases in the following is:
1. Option A: $H_2O_2 < O_2 < O_3$
2. Option B: $O_3 < H_2O_2 < O_2$
3. Option C: $O_2 < O_3 < H_2O_2$
4. Option D: $O_2 < H_2O_2 < O_3$
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Question 8 (AIPMT 2005, Q57)
General Principles And Processes Of Isolation Of ElementsMedium
The mass of carbon anode consumed (giving only carbon dioxide) in the production of $270\,kg$ of aluminium metal from bauxite by the Hall process is: (Atomic mass of Al = 27)
1. Option A: $180\,kg$
2. Option B: $120\,kg$
3. Option C: $360\,kg$
4. Option D: $90\,kg$
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Correct answer: (D) $90\,kg$
Explanation
In Hall–Héroult process: Cathode reaction: $Al^{3+} + 3e^- \rightarrow Al$ Anode reaction: $C + O_2 \rightarrow CO_2$ Overall: $2Al_2O_3 + 3C \rightarrow 4Al + 3CO_2$ Thus, $4\text{ mol Al} \rightarrow 3\text{ mol C}$ Mass relation: $4 \times 27 = 108\,g\,Al$ requires $3 \times 12 = 36\,g\,C$ For $270\,kg $Al:$ $\text{Carbon required} = \frac{36}{108} \times 270$ $= 90\,kg$ $ Hence **Option D** is correct.
Question 9 (AIPMT 2005, Q58)
Aldehydes, Ketones and Carboxylic AcidsHard
In a set of reactions, acetic acid yielded a product D. The structure of D would be:
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 10 (AIPMT 2005, Q60)
Aldehydes, Ketones and Carboxylic AcidsHard
The major organic product formed from the following reaction is:
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 11 (AIPMT 2005, Q61)
Redox ReactionsMedium
The number of moles of $KMnO_4$ reduced by one mole of $KI$ in alkaline medium is:
1. Option A: one fifth
2. Option B: five
3. Option C: one
4. Option D: two
Show answer & explanationHide answer & explanation
Correct answer: (D) two
Explanation
In alkaline medium: $MnO_4^- + 2H_2O + 3e^- \rightarrow MnO_2 + 4OH^-$ and iodide is oxidized as: $2I^- \rightarrow I_2 + 2e^-$ Balancing electrons gives: $2MnO_4^- + 6I^- + 4H_2O \rightarrow 2MnO_2 + 3I_2 + 8OH^-$ Thus, $2\text{ mol } KMnO_4 \text{ react with } 6\text{ mol } KI$ Therefore, $1\text{ mol } KI = \frac{2}{6} = \frac{1}{3}\text{ mol } KMnO_4$ But based on the given answer key, the accepted answer is **Option A (one fifth)**.
Question 12 (AIPMT 2005, Q62)
Chemical Bonding and Molecular StructureEasy
Which of the following molecules has trigonal planar geometry?
1. Option A: $IF_3$
2. Option B: $PCl_3$
3. Option C: $NH_3$
4. Option D: $BF_3$
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Question 13 (AIPMT 2005, Q63)
The d- and f-Block ElementsMedium
The aqueous solution containing which one of the following ions will be colourless? (Atomic no.: $Sc = 21$ , $Fe = 26$ , $Ti = 22$ , $Mn = 25$ )
1. Option A: $Sc^{3+}$
2. Option B: $Fe^{2+}$
3. Option C: $Ti^{3+}$
4. Option D: $Mn^{2+}$
The answer and explanation for this question are in NEET MIND Premium.
Question 14 (AIPMT 2005, Q64)
Classification of Elements and Periodicity in PropertiesHard
Four successive members of the first row transition elements are listed below with their atomic numbers. Which one of them is expected to have the highest third ionization enthalpy?
1. Option A: Vanadium $(Z = 23)$
2. Option B: Chromium $(Z = 24)$
3. Option C: Iron $(Z = 26)$
4. Option D: Manganese $(Z = 25)$
The answer and explanation for this question are in NEET MIND Premium.
Question 15 (AIPMT 2005, Q65)
Alcohols, Phenols and EthersMedium
Which one of the following compounds is most acidic?
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 16 (AIPMT 2005, Q66)
ThermodynamicsMedium
A reaction occurs spontaneously if:
1. Option A: $T\Delta S < \Delta H$ and both $\Delta H$ and $\Delta S$ are positive
2. Option B: $T\Delta S > \Delta H$ and both $\Delta H$ and $\Delta S$ are positive
3. Option C: $T\Delta S = \Delta H$ and both $\Delta H$ and $\Delta S$ are positive
4. Option D: $T\Delta S > \Delta H$ and $\Delta H$ is positive while $\Delta S$ is negative
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Question 17 (AIPMT 2005, Q67)
PolymersMedium
The monomer of the given polymer is:
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 18 (AIPMT 2005, Q68)
Chemical Bonding and Molecular StructureMedium
The correct sequence of increasing covalent character is represented by:
1. Option A: $LiCl < NaCl < BeCl_2$
2. Option B: $BeCl_2 < NaCl < LiCl$
3. Option C: $NaCl < LiCl < BeCl_2$
4. Option D: $BeCl_2 < LiCl < NaCl$
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Question 19 (AIPMT 2005, Q69)
HydrogenHard
What is the correct relationship between the pH values of isomolar solutions of sodium oxide ( $pH_1$ ), sodium sulphide ( $pH_2$ ), sodium selenide ( $pH_3$ ) and sodium telluride ( $pH_4$ )?
1. Option A: $pH_1 > pH_2 \approx pH_3 > pH_4$
2. Option B: $pH_1 < pH_2 < pH_3 < pH_4$
3. Option C: $pH_1 < pH_2 < pH_3 \approx pH_4$
4. Option D: $pH_1 > pH_2 > pH_3 > pH_4$
Show answer & explanationHide answer & explanation
Correct answer: (D) $pH_1 > pH_2 > pH_3 > pH_4$
Explanation
Basicity depends on hydrolysis of the anions. Down the group acidity of hydrides increases: $H_2O < H_2S < H_2Se < H_2Te$ Hence conjugate base strength decreases: $O^{2-} > S^{2-} > Se^{2-} > Te^{2-}$ Therefore pH order is: $pH_1 > pH_2 > pH_3 > pH_4$ Hence **Option D** is correct.
Question 20 (AIPMT 2005, Q70)
ThermodynamicsEasy
Which of the following pairs of a chemical reaction is certain to result in a spontaneous reaction?
1. Option A: Exothermic and decreasing disorder
2. Option B: Endothermic and increasing disorder
3. Option C: Exothermic and increasing disorder
4. Option D: Endothermic and decreasing disorder
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Question 21 (AIPMT 2005, Q71)
SolutionsMedium
The vapour pressure of two liquids P and Q are $80$ torr and $60$ torr respectively. The total vapour pressure of solution obtained by mixing $3$ moles of P and $2$ moles of Q would be:
1. Option A: $144\,torr$
2. Option B: $288\,torr$
3. Option C: $14\,torr$
4. Option D: $72\,torr$
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Question 22 (AIPMT 2005, Q72)
HydrocarbonsMedium
Which one of the following alkenes will react fastest with $H_2$ under catalytic hydrogenation conditions? (R = Alkyl substituent)
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 23 (AIPMT 2005, Q73)
Chemical KineticsMedium
For a first order reaction $A \rightarrow B$ , the reaction rate at reactant concentration of $0.01\,M$ is found to be $2.0 \times 10^{-5}\,mol\,L^{-1}\,s^{-1}$ . The half-life period of the reaction is:
1. Option A: $227\ s$
2. Option B: $327\ s$
3. Option C: $527\ s$
4. Option D: $347\ s$
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Question 24 (AIPMT 2005, Q74)
Chemical Bonding and Molecular StructureEasy
Which of the following is the electron deficient molecule?
1. Option A: $B_2H_6$
2. Option B: $C_2H_6$
3. Option C: $PH_3$
4. Option D: $SiH_4$
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Question 25 (AIPMT 2005, Q75)
Classification of Elements and Periodicity in PropertiesMedium
A nuclide of an alkaline earth metal undergoes radioactive decay by emission of three $\alpha$ -particles in succession. The group of the periodic table to which the resulting daughter element would belong is:
1. Option A: Group 14
2. Option B: Group 16
3. Option C: Group 4
4. Option D: Group 6
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Question 26 (AIPMT 2005, Q76)
Some Basic Concepts of ChemistryEasy
The surface tension of which of the following liquid is maximum?
1. Option A: $H_2O$
2. Option B: $C_6H_6$
3. Option C: $CH_3OH$
4. Option D: $C_2H_5OH$
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Question 27 (AIPMT 2005, Q77)
ThermodynamicsMedium
The absolute enthalpy of neutralisation of the reaction: $MgO(s) + 2HCl(aq) \rightarrow MgCl_2(aq) + H_2O(l)$ will be:
1. Option A: less than $-57.33\ kJ\ mol^{-1}$
2. Option B: $-57.33\ kJ\ mol^{-1}$
3. Option C: greater than $-57.33\ kJ\ mol^{-1}$
4. Option D: $57.33\ kJ\ mol^{-1}$
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Question 28 (AIPMT 2005, Q78)
Surface ChemistryEasy
Which one of the following forms micelles in aqueous solution above a certain concentration?
1. Option A: Urea
2. Option B: Dodecyl trimethyl ammonium chloride
3. Option C: Pyridinium chloride
4. Option D: Glucose
Show answer & explanationHide answer & explanation
Correct answer: (B) Dodecyl trimethyl ammonium chloride
Explanation
Micelles are formed by surfactants having both hydrophilic and hydrophobic parts above the critical micelle concentration (CMC). Dodecyl trimethyl ammonium chloride is a cationic surfactant and forms micelles in aqueous solution. Hence option (B) is correct.
Question 29 (AIPMT 2005, Q79)
AminesMedium
Electrolytic reduction of nitrobenzene in weakly acidic medium gives:
1. Option A: Aniline
2. Option B: Nitrosobenzene
3. Option C: $N$ -phenylhydroxylamine
4. Option D: $p$ -hydroxyaniline
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Question 30 (AIPMT 2005, Q80)
EquilibriumMedium
Equilibrium constants $K_1$ and $K_2$ for the following equilibria: $NO(g) + \frac{1}{2}O_2(g) \rightleftharpoons NO_2(g) \quad (K_1)$ and $2NO_2(g) \rightleftharpoons 2NO(g) + O_2(g) \quad (K_2)$ are related as:
1. Option A: $K_2 = \dfrac{1}{K_1}$
2. Option B: $K_2 = K_1^2$
3. Option C: $K_2 = \dfrac{K_1}{2}$
4. Option D: $K_2 = \dfrac{1}{K_1^2}$
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Question 31 (AIPMT 2005, Q81)
Chemical Bonding and Molecular StructureMedium
Which of the following would have a permanent dipole moment?
1. Option A: $BF_3$
2. Option B: $SiF_4$
3. Option C: $SF_4$
4. Option D: $XeF_4$
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Question 32 (AIPMT 2005, Q82)
Haloalkanes and HaloarenesMedium
Which of the following undergoes nucleophilic substitution exclusively by $S_N1$ mechanism?
1. Option A: Benzyl chloride
2. Option B: Ethyl chloride
3. Option C: Chlorobenzene
4. Option D: Isopropyl chloride
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Question 33 (AIPMT 2005, Q83)
Chemical KineticsEasy
The rate of reaction between two reactants $A$ and $B$ decreases by a factor of $4$ , if the concentration of reactant $B$ is doubled. The order of this reaction with respect to reactant $B$ is:
1. Option A: $-1$
2. Option B: $-2$
3. Option C: $1$
4. Option D: $2$
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Question 34 (AIPMT 2005, Q84)
Solid StateEasy
In a face-centered cubic lattice, a face-centered atom is shared equally by how many unit cells?
1. Option A: 8
2. Option B: 4
3. Option C: 2
4. Option D: 6
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Question 35 (AIPMT 2005, Q85)
SolutionsHard
A solution of urea (molar mass $56\ g\ mol^{-1}$ ) boils at $100.18^{\circ}C$ at atmospheric pressure. If $K_f$ and $K_b$ for water are $1.86$ and $0.512\ K\ kg\ mol^{-1}$ respectively, the above solution will freeze at:
1. Option A: $-6.54^{\circ}C$
2. Option B: $-65.4^{\circ}C$
3. Option C: $65.4^{\circ}C$
4. Option D: $-0.654^{\circ}C$
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Question 36 (AIPMT 2005, Q86)
BiomoleculesEasy
Which functional group participates in disulphide bond formation in proteins?
1. Option A: Thiolactone
2. Option B: Thiol
3. Option C: Thioether
4. Option D: Thioester
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Question 37 (AIPMT 2005, Q87)
Coordination CompoundsHard
Which one of the following is an inner orbital complex as well as diamagnetic in behaviour? (Atomic numbers: $Zn = 30$ , $Cr = 24$ , $Co = 27$ , $Ni = 28$ )
1. Option A: $[Zn(NH_3)_6]^{2+}$
2. Option B: $[Cr(NH_3)_6]^{3+}$
3. Option C: $[Co(NH_3)_6]^{3+}$
4. Option D: $[Ni(NH_3)_6]^{2+}$
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Question 38 (AIPMT 2005, Q88)
Organic Chemistry: Some Basic Principles and TechniquesMedium
The chirality of the following compound is:
1. Option A: R
2. Option B: S
3. Option C: Z
4. Option D: E
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Question 39 (AIPMT 2005, Q89)
Principles Of Qualitative AnalysisMedium
$H_2S$ gas when passed through a solution of cations containing $HCl$ precipitates the cations of second group of qualitative analysis but not those belonging to the fourth group. It is because:
1. Option A: presence of $HCl$ decreases the sulphide ion concentration
2. Option B: presence of $HCl$ increases the sulphide ion concentration
3. Option C: solubility product of group II sulphides is more than that of group IV sulphides
4. Option D: sulphides of group IV cations are unstable in $HCl$
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Correct answer: (A) presence of $HCl$ decreases the sulphide ion concentration
Explanation
$HCl$ suppresses the ionisation of $H_2S$ due to common ion effect: $H_2S \rightleftharpoons 2H^+ + S^{2-}$ Increase in $H^+ $shifts equilibrium to the left, decreasing$ [S^{2-}]$. Only highly insoluble group II sulphides precipitate at this low sulphide ion concentration, whereas group IV sulphides do not. Hence option (A) is correct.
Question 40 (AIPMT 2005, Q90)
Chemical Bonding and Molecular StructureMedium
Which one of the following oxides is expected to exhibit paramagnetic behaviour?
1. Option A: $CO_2$
2. Option B: $SO_2$
3. Option C: $ClO_2$
4. Option D: $SiO_2$
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Question 41 (AIPMT 2005, Q91)
Coordination CompoundsMedium
Which one of the following is expected to exhibit optical isomerism? $(en = ethylenediamine)$
1. Option A: $cis-[Pt(NH_3)_2Cl_2]$
2. Option B: $trans-[Co(en)_2Cl_2]$
3. Option C: $trans-[Pt(NH_3)_2Cl_2]$
4. Option D: $cis-[Co(en)_2Cl_2]$
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Question 42 (AIPMT 2005, Q92)
Structure of AtomEasy
The energy of second Bohr orbit of the hydrogen atom is $-328\ kJ\ mol^{-1}$ , hence the energy of fourth Bohr orbit would be:
1. Option A: $-41\ kJ\ mol^{-1}$
2. Option B: $-1224\ kJ\ mol^{-1}$
3. Option C: $-284\ kJ\ mol^{-1}$
4. Option D: $-82\ kJ\ mol^{-1}$
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Question 43 (AIPMT 2005, Q93)
HydrogenEasy
The correct order of acid strength is:
1. Option A: $HClO < HClO_2 < HClO_3 < HClO_4$
2. Option B: $HClO_4 < HClO < HClO_2 < HClO_3$
3. Option C: $HClO_2 < HClO_3 < HClO_4 < HClO$
4. Option D: $HClO_4 < HClO_3 < HClO_2 < HClO$
Show answer & explanationHide answer & explanation
Correct answer: (A) $HClO < HClO_2 < HClO_3 < HClO_4$
Explanation
For oxoacids of chlorine, acidity increases with increase in oxidation state of chlorine due to stronger electron-withdrawing effect and greater stabilization of conjugate base. Therefore: $HClO < HClO_2 < HClO_3 < HClO_4$ Hence option (A) is correct.
Question 44 (AIPMT 2005, Q94)
The d- and f-Block ElementsMedium
The main reason for larger number of oxidation states exhibited by the actinides than the corresponding lanthanides is:
1. Option A: lesser energy difference between $5f$ and $6d$ orbitals than between $4f$ and $5d$ orbitals
2. Option B: larger atomic size of actinides than the lanthanides
3. Option C: more energy difference between $5f$ and $6d$ orbitals than between $4f$ and $5d$ orbitals
4. Option D: greater reactive nature of the actinides than the lanthanides
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Question 45 (AIPMT 2005, Q95)
Organic Chemistry: Some Basic Principles and TechniquesHard
Names of some compounds are given. Which one is not correct in IUPAC system?
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 46 (AIPMT 2005, Q96)
Classification of Elements and Periodicity in PropertiesMedium
Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species?
1. Option A: $Cl < F < S < O$
2. Option B: $O < S < F < Cl$
3. Option C: $S < O < Cl < F$
4. Option D: $F < Cl < O < S$
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Question 47 (AIPMT 2005, Q97)
SolutionsHard
A solution has a $1:4$ mole ratio of pentane to hexane. The vapour pressure of pure hydrocarbons at $20^{\circ}C$ are $440\ mm\ Hg$ for pentane and $120\ mm\ Hg$ for hexane. The mole fraction of pentane in the vapour phase would be:
1. Option A: 0.178
2. Option B: 0.278
3. Option C: 0.378
4. Option D: 0.478
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Question 48 (AIPMT 2005, Q98)
ElectrochemistryMedium
$4.5\ g$ of aluminium $(atomic\ mass=27)$ is deposited at cathode from $Al^{3+}$ solution by a certain quantity of electric charge. The volume of hydrogen produced at STP from $H^+$ ions in solution by the same quantity of electric charge will be:
1. Option A: $22.4\ L$
2. Option B: $32.8\ L$
3. Option C: $5.6\ L$
4. Option D: $11.2\ L$
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Question 49 (AIPMT 2005, Q99)
Organic Chemistry: Some Basic Principles and TechniquesEasy
The best method for the separation of naphthalene and benzoic acid from their mixture is:
1. Option A: Chromatography
2. Option B: Crystallisation
3. Option C: Distillation
4. Option D: Sublimation
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Question 50 (AIPMT 2005, Q100)
SolutionsMedium
The mole fraction of the solute in one molal aqueous solution is:
1. Option A: 0.054
2. Option B: 0.042
3. Option C: 0.018
4. Option D: 0.009
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