629 questions from a source that prints this span of years rather than the year of each question. Each opens with its answer and explanation.
ABC26IN0538 · The geometry and the number of unpaired electrons in tetrakis (1 - norbornyl)Co respectively, are: · 18 Electron Rule
ABC26IN0539 · The metal borides that contain isolated boron atoms are: · Metal Carbonyls
ABC26IN0540 · The Mo-Mo bond order in [ (5-C5 H5 ) Mo(CO)2 ]2 which obeys the 18-electron rule is ____ · 18 Electron Rule
ABC26IN0541 · Gas phase bond length and dipole moment of a compound (MX) is 3 and 10.8 D, respectively. The ionic character in gas phase MX is ____ \%… · Perodic – General
ABC26IN0542 · and are two operators on number p and q such that p q=p2+q2pq and p q=p2q If x y=2 2, then x= · Perodic – General
ABC26PH0257 · One of the following is not related to polarography · Analytical – General
ABC26PH0258 · A substance undergoes a two electron reversible reduction at dropping mercury electrode, and gives a diffusion current of 7.5 mu A. When… · Analytical – General
ABC26PH0259 · The activity of water at 11 bar and 298 K is: · Analytical – General
ABC26PH0260 · A student recorded a polarogram of 2.0 mM Cd2+ solution and forgot to add KCl solution. What type of error do you expect in his results? · Analytical – General
ABC26PH0261 · For the titration of a 10 mL (aq) solution of CaCO3, 2 mL of 0.001 M Na2 EDTA is required to reach the end point. The concentration of… · Analytical – General
ABC26PH0262 · The set of eigenfunctions √(2/1) (n pi x)/a(0 x a, n=1,2,3 ) is · Atomic Structure – General
ABC26PH0263 · The function e^ax2( alpha >0) is not an acceptable wave function for bound system, because · Atomic Structure – General
ABC26PH0264 · First order peturbation correction Delta (1) to energy level of a simple harmonic oscillator due to the anharmonicity perturbation lambda… · Atomic Structure – General
ABC26PH0265 · The 2 s orbital of H - atom has radial node at 2 a0 because 2 s is proportional to · Atomic Structure – General
ABC26PH0266 · As per Huckel theory, pi -electron energy levels of cyclobutadiene are · Atomic Structure – General
ABC26PH0267 · Given that beta =-75 kJ / mol, cyclobutadiene is · Atomic Structure – General
ABC26PH0268 · The orbital =1sHA-1sHB of water belongs to the irreducible representation · Atomic Structure – General
ABC26PH0269 · In the Huckle model for benzene, the pi electronic transitions from the occupied to the unoccupied molecular orbitals do NOT occur at · Atomic Structure – General
ABC26PH0270 · To demonstrate the variational principle, a trial function =C1 2 s+3 s√(2)+C2 2 s-3 s√(2) where C1 and C2 are the variational parameters… · Atomic Structure – General
ABC26PH0271 · Which of the following pairs of operators commute? · Atomic Structure – General
ABC26PH0272 · The first excited state wavefunction for a particle in a box that spans from -a to +a is · Atomic Structure – General
ABC26PH0273 · A perturbation V= delta (x-a / 2) is introduced in the box. The first order energy correction to the first excited state is. · Atomic Structure – General
ABC26PH0274 · The dimension of Planck constant is (M, L and T denote mass, length and time respectively) · Atomic Structure – General
ABC26PH0275 · For a homonuclear diatomic molecule, the bonding molecular orbital is · Atomic Structure – General
ABC26PH0276 · The ionisation potential of hydrogen atom is 13.6 eV . The first ionisation potential of a sodium atom, assuming that the energy of its… · Atomic Structure – General
ABC26PH0277 · The quantum state of a particle moving in a circular path in a plane is given by ( phi )=(1 / √(2 pi )) eim phi , m=0, 1, 2, When a… · Atomic Structure – General
ABC26PH0278 · Consider a particle of mass m moving in a one-dimensional box under the potential V=0 for 0 x a and V= outside the box. When the particle… · Atomic Structure – General
ABC26PH0279 · The uncertainty in the momentum ( Delta ps ) of the particle in its lowest energy state is: · Atomic Structure – General
ABC26PH0280 · The lifetime of a molecule in an excited electronic state is 10-10\,s. The uncertainty in the energy (eV) approximately is · Atomic Structure – General
ABC26PH0281 · The wavefunction of a diatomic molecule has the form =0.89+0.45. The chance that both electrons of the bond will be found on the same atom… · Atomic Structure – General
ABC26PH0282 · The ground state electronic energy (Hartree) of a helium atom, neglecting the inter-electron repulsion, is · Atomic Structure – General
ABC26PH0283 · A particle is confined to a one-dimensional box of length 1 mm . If the length is changed by 10-9 m, the \% change in the ground state… · Atomic Structure – General
ABC26PH0284 · The operation of the commutator [x, d / dx] on a function f(x) is equal to · Atomic Structure – General
ABC26PH0285 · The de-Broglie wavelength of the electron is ( lambda )/pm= (a/() ). The value of 'a' in volts is · Atomic Structure – General
ABC26PH0286 · The lowest allowed energy is eual to zero for · Atomic Structure – General
ABC26PH0287 · The degeneracy of a quantum particle in a cubic box having energy four times that of the lowest energy is · Atomic Structure – General
ABC26PH0288 · The de-Broglie wavelength for a He atom travelling at 1000 ms-1 (typical speed at room temperature ) is · Atomic Structure – General
ABC26PH0289 · For eigen functions 1=√(1/b) (( pi x)/b ) and 2=√(2/b) ((2 pi x)/b ) of a particle in a 1-D box of length b\;(0 x b) · Atomic Structure – General
ABC26PH0290 · The commutator [x3, px ] is equal to · Atomic Structure – General
ABC26PH0291 · An electron of mass 'm' is confined to a one dimensional box of length 'b'. If it makes a radiative transition from second excited state to… · Atomic Structure – General
ABC26PH0292 · The wave function for a harmonic oscillator described by Nx (- alpha x2 / 2 ) has · Atomic Structure – General
ABC26PH0293 · If an arbitrary wave function is used to calculate the energy of a quantum mechanical system, the value calculated is never less than the… · Atomic Structure – General
ABC26PH0294 · The wave function for a quantum mechanical particle in a 1-dimensional box of length 'a' is given by =A ( pi x)/a The value of ' A ' for a… · Atomic Structure – General
ABC26PH0295 · If Delta y and Delta Py are the uncertainties in the y -coordinate and the y component of the momentum of a particle respectively, then… · Atomic Structure – General
ABC26PH0296 · Choose the allowed transition · Atomic Structure – General
ABC26PH0297 · The angular part of the wavefunction for the electron in hydrogen atom is proportional to 2 theta theta e2 i phi . The values of the… · Atomic Structure – General
ABC26PH0298 · Let and denote the wavefunctions of the 2 px and 2 pz orbitals of carbon, respectively, and and 0 represent the wavefunction of the 2 px… · Atomic Structure – General
ABC26PH0299 · The wavefunction of a 1 - D harmonic oscillator between x=+ and x=- is given by (x)=N (2 x2-1 ) e^-x2 / 2. The value of N that normalizes… · Atomic Structure – General
ABC26PH0300 · The secular determinant (where alpha , beta and E have their usual meanings) is given by · Atomic Structure – General
ABC26PH0301 · The possible value of E are · Atomic Structure – General