AIPMT 2005

The correct sequence of increasing covalent character is represented by

Which of the following would have a permanent dipole moment?

Which of the following molecules has trigonal planar geometry?

The surface tension of which of the following liquid is maximum ?

The correct order in which the O \(-\) O bond length increases in the following is

Equilibrium constants K1 and K2 for the following equilibriam:

are related as

For a first order reaction A \(\to\) B the reaction rate a 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

The rate of reaction between two reactions 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

Which one of the following is expected to exhibit optical isomerism? (en = ethylenediamine)

Which one of the following is an inner orbital complex as well as diamagnetic in behaviour?

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 ionisation enthalpy?

The aqueous solution containing which one of the following ions will be colourless?
(Atomic number : Sc = 21, Fe = 26, Ti = 22, Mn = 25)

More number of oxidation states are exhibited by the actinoids than by the lanthanoids. The main reason for this is

The number of moles of KMnO4 reduced by one mole of KI in alkaline medium is

4.5 g of aluminium (at. mass 27 amu) is deposited at cathode from Al3+ 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

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 : Al = 27)

Which of the following undergoes nucleophilic substitution exclusively by SN1 mechanism?

Which one of the following alkenes will react faster with H2 under catalytic hydrogenation conditions ?

Products of the following reaction :

H2S 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

At 25oC, 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

A nuclide of an alkaline earth metal undergoes radioactive decay by emission of the periodic table to which the resulting daughter element would belong is

Aniline in a set of reactions yielded a product D.

The structure of the product D would be

Electrolytic reduction of nitrobenzene in weakly acidic medium gives

Which one of the following orders correctly represents the increasing acid strengths of the given acids?

What is the correct relationship between the pH of isomolar solutions of sodium oxide, Na2O (pH1), sodium sulphide, Na2S (pH2), sodium srlenide, Na2Se (pH3) and sodium telluride Na2Te (pH4)?

Which one of the following oxides is expected to exhibit paramagnetic behaviour?

Which one of the following arrangements represents the correct order of electron gain enthalpy (with negative sign) of the given atomic species ?

The monomer of the polymer

In a face-centered cubic lattice, a unit cell is shared equally by how many unit cells?

A solution of urea (mol. mass 56 g mol\(-\)1) boils at 100.18oC at the atmospheric pressure. If Kf and Kb for water are 1.86 and 0.512 K kg mol\(-\)1 respectively, the above solution will freeze at

A solution has a 1 : 4 mole ratio of pentane to hexane. The vapour pressures of the pure hydrocarbons at 20oC are 440 mm Hg for pentane and 120 mm Hg for hexane. The mole fraction of pentane in the vapour phase would be

The vapour pressure of two liquids P and Q are 80 and 60 torr, respectively. The total vapour pressure of solution obtained by mixing 3 mole of P and 2 mole of Q would be

The mole fraction of the solute in one molal aqueous solution is

The best method for the separation of naphthalene and benzoic acid from their mixture is

Which one of the following pairs represents stereoisomerism?

Names of some compounds are given. Which one is not in IUPAC system?

The chirality of the compound

Which amongst the following is the most stable carbocation?

The energy of second Bohr orbit of the hydrogen atom is \(-\)328 kJ mol\(-\)1; hence the energy of fourth Bohr orbit would be

Which one of the following forms micelles in aqueous solution above certain concentration?

Which of the following pairs of a chemical reaction is certain to result in a spontaneous reaction ?

A reaction occurs spontaneously if

The absolute enthalpy of neutralisation of the reaction :
Mg(O)(s) + 2HCl(aq) \(\to\) MgCl2(aq) + H2O(l) will be

In a circuit L, C and R are connected in series with an alternating voltage source of frquency \(f.\) The current leads the voltage by 45o. The value of C is

In any fission process the ratio

mass of fission products
mass of parent nucleus
is

Which one of the following pairs of nuclei are isotones ?

In the reaction \({}_1^2\)H + \({}_1^3\)H \(\to\) \({}_2^4\)He + \({}_0^1\)n, if the binding energies of \({}_1^2\) H, \({}_1^3\)H and \({}_2^4\)He are respectively a, b and c (in MeV), then the energy (in MeV) released in this reaction i...

Energy levels A, B and C of a certain atom corresponding to increasing values of energy i.e. EA < EB < EC. If \(\lambda\)1, \(\lambda\)2 and \(\lambda\)3 are wavelengths of radioations corresponding to transitions C to B, B to A and C ...

The total energy of an electron in the first excited state of hydrogen atom is about \(-\) 3.4 eV. Its kinetic energy in this state is