AIEEE ONLINE EXAMINATION 2011 Important Questions.

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


Options:



276 pm
371 pm
357 pm
552 pm


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


Options:



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


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


Options:



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


4. When treated with conc. gives A. The product A is


Options:



Both the statements are true and statement-2 is a correct explanation for statement1
Both the statements are true but statement-1 is not a correct explanation for statement2
Statement-1 is false and statement-2 is true
Statement-2 is false and statement-1 is true



5. 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



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


Options:



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



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


Options:



1
e
e^2
e^-2



8. Helium molecule does not exist because (Atomic number of He is 2)


Options:



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


9. The rate and rate constant of a chemical reaction,


Options:



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

10. 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


11. 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


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


Options:



In solutions where the solute associates the elevation in B.P is more
In distribution reactions the decrease in Freezing point is less
Absolute enthalpy of a compound is equal to heat of formation of that compound
The units of rate of a third order reaction are lit per second


13.Identify the wrong statement in the following :


Options:



Feron used as refrigeratnt is dichlorodifluro methane
A deutron is a nucleus containing a neutron and a proton
Zeolite is an example of 3-dimensional silicate
The anhydride of acid is HCL0 is Cl2O3


14.Pick the wrong statement from the following


Options:



The most common measurement of atmospheric particulate is the particulate matter and is referred to as PM
PM is measured in lenth of
DDT is the one of the most famous is sectide . The full name of dichloro diphenyl tnchloro ethane
Chlorofluoro carbons are good refrigerants


15. A liquid is in equilibrium with its vapor at its boiling point. On the average the molecules in the two phases have equals


Options:



inter molecular forces
potential energy
total energy
kinetic energy


16. In crystalobaltie, the coordination number of silicon is


Options:



Two
Three
Six
Four


17.Knowing that the startered reduction potential for lithium is -3.045 V and that of sodium -2.714 V, which of the following statements is correct ?


Options:



This correctly shows that the reactivity of the elements decreases down the group.
This is anamalous and arises from small size and very large hydration energy of the free gaseous lithium ion as compared to with of sodium.
This is anomalous and anies from large size and consequently large hydration energy of the free gaseous sodium ion as compared to that of lithium
This is anomalous and arrises from small size consequently low hydration energy of free gaseous lithium ion as compared to with of sodium.



18.Upon adding solid sodium acetate to an aqueous acetic acid solution, there is


Options:



an increases in the degree of ionization of acetic acid
an increases in the ionization constant of acetic aci
a decrease in the OH- concentration of the solution
a decrease in the OH+ concentration of the solution.


19.Which are of the following pairs of chemical compounds does Not give a buffer solution on suitable mixing ?


Options:



Ammonium chloride and ammonium hydroxide
Acetic acid and sodium acetateto with of sodium.
Hydrochloric acid and aniline hydrochloride
Sodium carbonae and sodium hydrogen carbonate



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