AIPMT 2008

If the concentration of OH\(-\) ions in the reaction
Fe(OH)3(s) \(\rightleftharpoons\) Fe3+(aq) + 3OH\(-\)(aq)
is decreased by 1/4 times, then equilibrium concentration of Fe3+ will increase by

The dissociation equilibrium of a gass AB2 can be represented as :
2AB2(g) \(\rightleftharpoons\) 2AB(g) + B2(g)
The degree of dissociation is x and is small compared to 1. The expression relating the degree of dissociation (x) with equil...

The values of for the reactions,
X \(\rightleftharpoons\) Y + Z      . . . .(i)
A \(\rightleftharpoons\) 2B       . . . .(ii)
are in the ratio 9 : 1. If degree of dissociation of X and A be equal, then total pressure at equilibrium (i)...

The rate constants k1 and k2 for two different reactions are 1016 \(\cdot\) e\(-\)2000/T and 1015 \(\cdot\) e\(-\)1000/T, respectively.
The temperature at which k1 = k2 is

The bromination of acetone that occurs in acid solution is represented by this equation.
CH3COCH3(aq) + Br2(aq)  \(\to\)
     CH3COCH2Br(aq) + H+(aq) + Br\(-\)(aq)
These kinetic data were obtained for given reaction concentrations.

.tg ...

Which of the following complexes exhibits the highest paramagnetic behaviour?
where gly = glycine, en = ethylenediamine and bpy = bipyridyl moities.
(At. nos. Ti = 22, V = 23, Fe = 26, Co = 27)

In which of the following coordination entities the magnitude of \(\Delta\)o (CFSE in octahedral field) will be maximum?
(At. No. Co = 27)

The correct order of decreasing second ionisation enthalpy of Ti(22), V(23), Cr(24) and Mn(25) is

Kohlrausch's law states that at

On the basis of the following Eo values, the strongest oxidizing agent is
[Fe(CN)6]4\(-\) \(\to\) [Fe(CN)6]3\(-\) + e\(-\);  Eo = \(-\)0.35 V
Fe2+ \(\to\) Fe3+ + e\(-\);  Eo = \(-\)0.77 V

Standard free energies of formation (in kJ/mol) at 298 K are \(-\)237.2, \(-\) 394.4 and \(-\)8.2 for H2O(l), CO2(g) and pentane (g) respectively. The value of Eocell for the pentane-oxygen fuel cell is

Green chemistry means such reactions which

If a gas expands at constant temperature, it indicates that

Volume occupied by one molecule of water (density = 1 g cm\(-\)3) is

In a SN2 substitution reaction of the type
R \(-\) Br + Cl\(-\) \(\buildrel {DMF} \over \longrightarrow\) R\(-\)Cl + Br\(-\)
which one of the following has the highest relative rate?

A (predominantly) is

In the hydrocarbon,

The state of hybridization of carbons 1, 3 and 5 are in the following sequence

Equal volumes of three acid solutions of pH 3, 4 and 5 are mixed in a vessel. What will be the H+ ion concentration in the mixture?

In a reaction of aniline a coloured product C was obtained.

The structure of C would be

The angular shape of ozone molecule (O3) consists of

Which one of the following arrangements does not give the correct picture of the trends indicated against it ?

Which one of the following statements is not true?

Number of moles of MnO\(_4^{ - }\) required to oxidize one mole of ferrous oxalate completely in acidic medium will be

The sequence of ionic mobility in aqueous solution is

Equimolar solutions of the following were prepared in water separately. Which one of the solutions will record the highest pH?

The alkali metals form salt-like hydrides by the direct synthesis at elevated temperature. The thermal stability of these hydrides decreases in which of the following orders?

With which one of the following elements silicon should be doped so as to give p-type of semiconductor?

Percentage of free space in a body centred cubic unit cell is

If \(a\) stands for the edge length of the cubic systems: simple cubic, body centred cubic and face centred cubic, then the ratio of radii of the spheres in these systems will be respectively

Which of the following statements is not correct?

An organic compound contains carbon, hydrogen and oxygen. Its elemental analysis gave C, 38.71% and H, 9.67%. The empirical formula of the compound would be

How many moles of lead (II) chloride will be formed from a reaction between 6.5 g of PbO and 3.2 g HCl ?

What volume of oxygen gas (O2) measuread at 0oC and 1 atm, is needed to burn completely 1 L of propane gas (C3H8) measured under the same conditions ?

How many stereoisomers does this molecule have?
CH3CH\(=\)CHCH2CHBrCH3

Base strength of

is in the order of

The stability of carbanions in the following.

is in the order of

Which one of the following is most reactive towards electrophilic attack?

The measurement of the electron position is associated with an uncertainty in momentum, which is equal to 1 \(\times\) 10\(-\)18 g cm s\(-\)1. The uncertainty in electron velocity is (mass of an electron is 9 \(\times\) 10\(-\)28 g)

If uncertainty in position and momentum are equal, then uncertainty in velocity is

Which of the following are not state functions ?
(I) q + w     (II) q
(III) w        (IV) H \(-\) TS

Bond dissociation enthalpy of H2, Cl2 and HCl are 434, 242 and 431 kJ mol\(-\)1 respectively. Enthalpy of formation of HCl is

For the gas phase reaction,
PCl5(g)  \(\rightleftharpoons\) PCl3(g) + Cl2(g)
which of the following conditions are correct ?

In an a.c. circuit the e.m.f. (\(\varepsilon\)) and the current
(i)  at any instant are given respectively by
\(\varepsilon\) = E0sin\(\omega\)t,   \(i\) = \(I\)0sin(\(\omega\)t \(-\) \(\phi\))
The average power in the circuit over o...

Two radioactive materials X1 and X2 have decay constants \(5\lambda\) and \(\lambda\) respectively. If initially they have the same number of nuclei, then the ratio of the number of nuclei of X1 to that X2 will be 1/e after a time

The ground state energy of hydrogen atom is \(-\) 13.6 eV. When its electron is in the first excited state, its excitation energy is

Two nuclei have their mass numbers in the ratio of 1 : 3. The ratio of their nuclear densities would be

If M(A; Z), Mp and Mn denote the masses of the nucleus \({}_Z^AX,\) proton and neutron respectively in units of u (1 u = 931.5 MeV/c2) and BE represents its bonding energy in MeV, then

A parallel plate capacitor has a uniform electric field E in the space between the plates. If the distance between the plates is d and area of each plate is A, the energy stored in the capacitor is

A shell of mass 200 gm is ejected from a gun of mass 4 kg by an explosion that generates 1.05 kJ of energy. The initial velocity of the shell is :

A particle of mass m is projected with velocity v making an angle of 45o with the horizontal. When the particle lands on the level ground the magnitude of the change in its momentum will be :