Leaked Question Paper of AIEEE 2011 Exam.

20.The half-life period of a second order reaction products


Options:



independent of the initial concentraiton of A
inversely proportional to the initial concentraiton of A
directly proportional to the initial concentration of A
inversely proportional to the square of the initial concentration of A




21.The langmuir adsorption isotherm is based on the characteristic assumption of


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a flat solid surface
a constant heat of adsorption independent of surface coverage
zero activation energy for adsorption and desorption
ideal gaseous behaviour



22.The energy is quantized in all of the following systems EXCEPT


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an electron in an atomic orbital
a particle in free space
a particle in a box
a simple harmonic oscillator



23.An open vessel at 27C is heated until 60% of the air in it has been expelled. Assuming that the volume of the vessel remains constant, the temperature to which the vessel has been heated is


Options:

600C
477C
750C
1000C

24.Which of the following element act as insulator ?


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Po
Pe
S
Se


25. The ionic radii of and are 95 pm and 181 pm, respectively, The length of the unit cell of is


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276 pm
371 pm
357 pm
552 pm

26. Which is true for the following equilibrium reactions, PCL5, PCl3, Cl2


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On addition of the concentration of decreases
Addition of either or will shift the equilibrium towards the left side
On removal of the concentration of increases
Addition of either or will shift the equilibrium towards the right side



27. Molar masses of three gases and are and respectively. If molar masses are in order the incorrect statement about their most probable velocity is :


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Vmp of A > Vmp of B
Vmp of B > Vmp of C
Vmp of A < Vmp of B
Vmp of B > Vmp of B


28.The langmuir adsorption isotherm is based on the characteristic assumption of


Options:



a flat solid surface
a constant heat of adsorption independent of surface coverage
zero activation energy for adsorption and desorption
ideal gaseous behaviour


29.The order of reaction n, the unitial concentration of the reaction and time required for half of the reaction are related by which equation ?


Options:



ln t1/2 = ln(constant)- (n-1)ln a0
ln t1/2 = ln(constant)+ (n-1)ln a0
ln t1/2 = ln(constant)+ (n-1)ln
ln t1/2 = ln(constant)+ (n+1)ln


30.Benzoic acid undergoes dimerization in benzene solution, the Vant Hoff factor i is related to the degree of dissociation x of the acid as


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i = (1-x)
i = (1+x)
i = (1-x/2)
i = (1-x/2)


31. The type of hybridization and the shape of the molecule in are respectively


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Sp3, Tetrahedral
Sp2, Tetrahedral
dsp3, trigonal bipyramidal
Sp3d, T-shaped


32. Helium molecule does not exist because Atomic number of He is 2


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number of antibody orbitals in greater than the number of bonding orbitals
number of bonding orbitals is guater than number of antibody orbitals
its bond and order is zero
its bond order is positive


33. The rate and rate constant of a chemical reaction


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are idmtical gromtities
are independent of each other
are related to rate constant in equal to rate dividend by concentraiton of reactants
are related and rate is equal to rate constant dividend by concetration of reactants



34. Rate constants of two reactions at 3535 C are equal. Temperature coefficients of these reactions are 2 and 3 respectively. The rtio of the constants of these reactions at 85C is


Options:



4/27
8/27
32/243
16/81


35. Which gas can be absorbed on a solid to a greater extent ?


Options:



A gas which is non polar
A gas having highest critical temp
A gas having lowest critical temp
A gas having highest critical pressure