question_answer5) If\[\alpha \]is the degree of dissociation of\[N{{a}_{2}}S{{O}_{4}},\] the van't Hoff factor (i) used for calculating the molecular mass is
AIEEE Solved Paper-2005
question_answer10) An ionic compound has a unit cell consisting of A ions at the corners of a cube and B ions on the centres of the faces of the cube. The empirical formula for this compound would be
AIEEE Solved Paper-2005
question_answer13) Consider an endothermic reaction\[X\to Y\]with the activation energies\[{{E}_{b}}\]and\[{{E}_{f}}\]for the backward and forward reactions respectively. In general
AIEEE Solved Paper-2005
A)
there is no definite relation between\[{{E}_{b}}\]and \[{{E}_{f}}\]
question_answer14) Aluminium oxide may be electrolysed at \[1000{}^\circ C\]to furnish aluminium metal (Atomic mass\[=27u;\] 1 Faraday = 96500. The cathode reaction is \[A{{l}^{3+}}+3{{e}^{-}}\to A{{l}^{0}}\] To prepare 5.12 kg of aluminium metal by this method would require
AIEEE Solved Paper-2005
question_answer15) The volume of a colloidal particle, \[{{V}_{C}}\] as compared to the volume of a solute particle in a true solution \[{{V}_{S}},\] could be
AIEEE Solved Paper-2005
question_answer16) Consider the reaction \[{{N}_{2}}+3{{H}_{2}}\xrightarrow{\,}2\,N{{H}_{3}}\] carried out at constant temperature and pressure. If\[\Delta H\]and\[\Delta U\]are the enthalpy and internal energy changes for the reaction, which of the following expressions is true?
AIEEE Solved Paper-2005
question_answer17) The solubility product of a salt having general formula\[M{{X}_{2}},\]in water is\[4\times {{10}^{-12}}\]. The concentration of\[{{M}^{2+}}\]ions in the aqueous solution of the salt is
AIEEE Solved Paper-2005
question_answer18) Benzene and toluene form nearly ideal solutions. At\[20{}^\circ C,\]the vapour pressure of benzene is 75 torr and that of toluene is 22 torr. The partial vapour pressure of benzene at \[20{}^\circ C,\]for a solution containing 78 g of benzene and 46 g of toluene in torr is
AIEEE Solved Paper-2005
question_answer19) Which one of the following statements is not true about the effect of an increase in temperature on the distribution, of molecular speeds in a gas?
AIEEE Solved Paper-2005
A)
The area under the distribution curve remains the same as under the lower temperature
doneclear
B)
The distribution becomes broader
doneclear
C)
The fraction of the molecules with the most probable speed increases
question_answer20) For the reaction, \[2N{{O}_{2}}(g)2NO(g)+{{O}_{2}}(g)\] \[({{K}_{c}}=1.8\times {{10}^{-6}}at\text{ }184{}^\circ C)\] \[(R=0.00831\text{ }kJ/(molK))\] When \[{{K}_{p}}\] and\[{{K}_{c}}\]are compared at\[184{}^\circ C\]it is found that
AIEEE Solved Paper-2005
A)
whether \[{{K}_{p}}\] is greater than, less than or equal to\[{{K}_{C}}\]depends upon the total gas pressure
question_answer21) The exothermic formation of \[Cl{{F}_{3}}\] is represented by the equation \[C{{l}_{2}}(g)+3{{F}_{2}}(g)2Cl{{F}_{3}}(g);\] \[\Delta {{H}_{r}}=-329kJ\] Which of the following will increase the quantity of\[Cl{{F}_{3}}\] in an equilibrium mixture of \[C{{l}_{2}},{{F}_{2}}\]and\[Cl{{F}_{3}}\]?
AIEEE Solved Paper-2005
question_answer24) Two solutions of a substance (non electrolyte) are mixed in the following manner. 480 mL of 1.5 M first solution +520 mL of 1.2 M second solution. What is the molarity of the final mixture?
AIEEE Solved Paper-2005
question_answer25) During the process of electrolytic refining of copper, some metals present as impurity settle as 'anode mud'. These are
AIEEE Solved Paper-2005
question_answer27) If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will
AIEEE Solved Paper-2005
A)
be a function of the molecular mass of the substance
question_answer28) In a multi-electron atom, which of the following orbitals described by the three quantum numbers will have the same energy in the absence of magnetic and electric fields? (A)\[n=1,l=0,m=0\] (B)\[n=2,l=0,m=0\] (C)\[n=2,l=1,\text{ }m=1\] (D)\[n=3,l=2,m=1\] (E)\[n=3,l=2,m=0\]
AIEEE Solved Paper-2005
question_answer29) Based on lattice energy and other considerations which one of the following alkali metal chlorides is expected to have the highest melting point?
AIEEE Solved Paper-2005
question_answer30) A schematic plot of In\[{{K}_{eq}}\]versus inverse of temperature for a reaction is shown below \[\log {{K}_{eq}}=\frac{-\Delta {{H}^{o}}}{2.303RT}+\frac{-\Delta {{S}^{o}}}{R}\] The reaction must be
AIEEE Solved Paper-2005
question_answer33) The disperse phase in colloidal iron (III) hydroxide and colloidal gold is positively and negatively charged, respectively. Which of the following statements is not correct?
AIEEE Solved Paper-2005
A)
Coagulation in both sols can be brought about by electrophoresis
doneclear
B)
Mixing the sols has no effect
doneclear
C)
Sodium sulphate solution causes coagulation in both sols
doneclear
D)
Magnesium chloride solution coagulates, the gold sol more readily than the iron (III) hydroxide sol
question_answer40) The oxidation state of chromium in the final product formed by the reaction between \[KI\] and acidified potassium dichromate solution is
AIEEE Solved Paper-2005
question_answer48) Which one of the following cyano complexes would exhibit the lowest value of paramagnetic behaviour? (Atomic number\[Cr=24,Mn=25,\text{ }Fe=26,\] \[Co=27\])
AIEEE Solved Paper-2005
question_answer52) The decreasing order of nucleophilicity among the nucleophiles (A)\[C{{H}_{3}}\underset{\begin{smallmatrix} |\,| \\ O \end{smallmatrix}}{\mathop{C}}\,-{{O}^{-}}\] (B) \[C{{H}_{3}}{{O}^{-}}\] (C) \[C{{N}^{-}}\] (D)
AIEEE Solved Paper-2005
question_answer65) The reaction, \[R-\overset{\begin{smallmatrix} O \\ |\,| \end{smallmatrix}}{\mathop{C}}\,-X+N{{u}^{\text{O-}}}\] \[\xrightarrow{{}}R-\overset{\begin{smallmatrix} O \\ |\,| \end{smallmatrix}}{\mathop{C}}\,-Nu+{{X}^{\text{O-}}}\] is fastest when X is
AIEEE Solved Paper-2005
question_answer69) The value of the 'spin only' magnetic moment for one of the following configurations is 2.84 BM. The correct one is
AIEEE Solved Paper-2005
A)
\[{{d}^{5}}\](in strong ligand field)
doneclear
B)
\[{{d}^{3}}\](in weak as well as in strong fields)
question_answer70) Reaction of cyclohexanone with dimethylamine in the presence of catalytic amount of an acid forms a compound. Water during the reaction is continuously removed. The compound formed is generally known as
AIEEE Solved Paper-2005
question_answer71) p-cresol reacts with chloroform in alkaline medium to give the compound A which adds hydrogen cyanide to form, the compound B. The latter on acidic hydrolysis gives chiral carboxylic acid. The structure of the carboxylic acid is
AIEEE Solved Paper-2005
question_answer72) If the bond dissociation energies of\[XY,{{X}_{2}}\]and \[{{Y}_{2}}\](all diatomic molecules) are in the ratio of 1: 1: 0.5 and\[\Delta {{H}_{f}}\]for the formation of\[XY\]is\[-200\text{ }kJ\text{ }mo{{l}^{-1}}\]. The bond dissociation energy of \[{{X}_{2}}\] will be
AIEEE Solved Paper-2005
question_answer73) An amount of solid\[N{{H}_{4}}HS\]is placed in a flask already containing ammonia gas at a certain temperature and 0.50 atm pressure. Ammonium hydrogen sulphide decomposes to yield\[N{{H}_{3}}\]and\[{{H}_{2}}S\]gases in the flask. When the decomposition reaction reaches equilibrium, the total pressure in the flask rises to 0.84 atm? The equilibrium constant for \[N{{H}_{4}}HS\] decomposition at this temperature is
AIEEE Solved Paper-2005
question_answer74) An organic compound having molecular mass 60 is found to contain C = 20%, H = 6.67% and N = 46.67% while rest is oxygen. On heating it gives\[N{{H}_{3}}\]along with a solid residue. The solid residue give violet colour with alkaline copper sulphate solution. The compound is
AIEEE Solved Paper-2005
question_answer75) \[{{t}_{1/4}}\]can be taken as the time taken for the concentration of a reactant to drop to 3/4 of its Initial value. If the rate constant for a first order reaction is k, the \[{{t}_{1/4}}\] can be written as
AIEEE Solved Paper-2005