AIPMT 2003

Vitamin B12 contains

Which one of the following statements is not correct for sigma- and pi- bonds formed between two carbon atoms?

The reaction quotient (Q) for the reaction N2(g) + 3H2(g) \(\rightleftharpoons\) 2NH3(g) is given by \(Q = {{{{\left[ {N{H_3}} \right]}^2}} \over {\left[ {{N_2}} \right]{{\left[ {{H_2}} \right]}^3}}}\). The reaction will proceed from rig...

The equilibrium constants of the following are
N2 + 3H2 \(\rightleftharpoons\) 2NH3;     K1
N2 + O2 \(\rightleftharpoons\) 2NO;     K2
H2 + \({1 \over 2}\)O2 \(\rightleftharpoons\)
H2O;     K3
The equilibrium constant (K) of the rea...

The temperature dependence of rate constant (k) of a chemical reaction is written in terms of Arrhenius equation, \(k = A \cdot {e^{ - E{}^ * /RT}}\). Activation energy (E\(*\)) of the reaction can be calculated by plotting

If the rate of the reaction is equal to the rate constant, the order of the reaction is

The activation energy for a simple chemical reaction A \(\rightleftharpoons\) B is E\(a\) in forward direction.
The activation energy for reverse reaction

The reaction A \(\to\) B follows first order kinetics. The time taken for 0.8 mole of A to produce 0.6 mole of B is 1 hour. What is the time taken for conversion of 0.9 mole of A to produce 0.675 mole of B?

Among the following which is not the \(\pi\)-bonded organometallic compound?

The number of unpaired electrons in the complex ion [CoF6]3\(-\) is
(Atomic no. : Co = 27)

The basic character of the transition metal monoxides follows the order
(Atomic no's. Ti = 22, V = 23, Cr = 24, Fe = 26)

Which one of the following characteristics of the transition metals is associated with their catalytic activity?

The correct order of ionic radii of Y3+, La3+, Eu3+ and Lu3+ is
(Atomic nos. Y = 39, La = 57, Eu = 63, Lu = 71)

The e.m.f. of a Daniell cell at 298 K is E1.

When the concentration of ZnSO4 is 1.0 M and that of CuSO4 is 0.01 M, the e.m.f. changed to E2. What is the relationship between E1 and E2?

On the basis of the information available from the reaction,
4/3Al + O2 \(\to\) 2/3Al2O3,   \(\Delta\)G = \(-\) 827 kJ mol\(-\)1 of O2,
the minimum e.m.f. required to carry out an electrolysis of Al2O3 is
(F = 96500 C mol\(-\)1)

In Haber process 30 litres of dihydrogen and 30 litres of dinitrogen were taken for reaction which yielded only 50% of the expected product. What will be the composition of gaseous mixture underthe aforesaid condition in the end ?

The compound

on reaction with NaIO4 in the presence of KMnO4 gives

The correct order of reactivity towards the electrophilic substitution of the compounds aniline (I), benzene (II) and nitrobenzene (III) is

Which one of the following is a free-radical substitution reaction ?

The structure of H2O2 is

The solubility product of AgI at 25oC is 1.0 \(\times\) 10\(-\)16 mol2 L\(-\)2. The solubility of AgI in 10\(-\)4 N solution of KI at 25oC is approximately (in mol L\(-\)1

The radioistope, tritium (\({}_1^3\)H) has a half-life of 12.3 years. If the initial amount of tritium is 32 mg, how many milligrams of it would remain after 49.2 years?

The final product C, obtained in this reaction

would be

Which one of the following compounds is not a protonic acid?

Which one of the following statements is not true?

The ions O2\(-\), F\(-\), Na+, Mg2+ and Al3+ are isoelectronic. Their ionic radii show

Which one of the following monomers gives the polymer neoprene on polymerization?

Acrilan is a hard, horny and a high melting material. Which one of the following represents its structure?

The method of zone refining of metals is based on the principle of

The oxidation states of sulphur in the anions
SO3\({_3^{2 - }}\), S2O\({_4^{2 - }}\) and S2O\({_6^{2 - }}\) follow the order

The pyknometric density of sodium chloride crystal is 2.165 \(\times\) 103 kg m\(-\)3 while its X-ray density is 2.178 \(\times\) 103 kg m\(-\)3. The fraction of unoccupied sites in sodium chloride crystal is

Name of the compound given below is

Which of the following pairs of compounds are enantiomers?

Which one of the following orders of acid strength is correct ?

The velocity of Planck's constant is 6.63 \(\times\) 10\(-\)34 J s.
The velocity of light is 3.0 \(\times\) 108 m s\(-\)1. Which value is closest to the wavelength in nanometers of a quantum of light with frequency of 8 \(\times\) 1...

According to the adsorption theory of catalysis, the speed of the reaction increases because

For which one of the following equations is \(\Delta\)Horeact equal to \(\Delta\)Hof for the product ?

What is the entropy change (in J K\(-\)1 mol\(-\)1) when one mole of ice is converted into water at 0oC? (The enthalpy change for the conversion of ice to liquid water is 6.0 kJ mol\(-\)1 at 0oC).

The densities of graphite and diamond at 298 K are 2.25 and 3.31 g cm\(-\)3, respectively. If the standard free energy difference \(\left( {\Delta {G^o}} \right)\) is equal to 1895 J mol\(-\)1, the pressure at which graphite will be transfo...

For the reaction,
C3H8(g) + 5O2(g) \(\to\) 3CO2(g) + 4H2O(l)
at constant temperature, \(\Delta\)H \(-\) \(\Delta\)E is

Formation of solution from two components can be considered as
(i) Pure solvent \(\to\) separated solvent molecules, \(\Delta\)H1
(ii) Pure solute \(\to\) separated solute molecules, \(\Delta\)H2
(iii) Separated solvent and solute mo...

The molar heat capacity of water at constant pressure, C, is 75 J K\(-\)1 mol\(-\)1. When 1.0 kJ of heat is supplied to 100 g of water which is free to expand, the increase in temperature of water is

The volume occupied by an atom is greater than the volume of the nucleus by a factor of about

The mass number of a nucleus is

A sample of radioactive element has a mass of 10 g at an instant t = 0. The approximate mass of this element in the sample after two mean lives is

Solar energy is mainly caused due to

In which of the following systems will the radius of the first orbit (n = 1) be minimum ?

A nuclear reaction given by
ZXA \(\to\) z+1YA + \(-\)1e0 + \(\overline v\) represents

The mass of proton is 1.0073 u and that of neutron is 1.0087 u (u = atomic mass unit). The binding energy of \({}_2^4\) He is
(Given helium nucleus mass \(\approx\) 4.0015 u.)

An electron is moving round the nucleus of a hydrogen atom in a circular orbit of radius r. The Coulomb force \(\overrightarrow F\) between the two is