489 questions from a source that prints this span of years rather than the year of each question. Each opens with its answer and explanation.
ABC26IN0518 · An example of nido-borane from the following is · Organometallic Compounds – General
ABC26IN0519 · The reaction of [Cp2 TaMe2] I (Cp=C5 H5-)with NaOMe yields. · Organometallic Compounds – General
ABC26IN0520 · Amonst the following, the metal carbonyl species having the highest vCO stretching frequency is · Metal Carbonyls
ABC26IN0521 · The correct order of thermal stability for the given compounds is · Cluster Compounds Wade Rules
ABC26IN0523 · An efficient catalyst for hdrogenation of alkenes is [Rh (PPh3)3 Cl]. However, [Ir (PPh3)3 Cl] does not catalyze this reaction, because · Metal Alkene Alkyne
ABC26IN0524 · When one CO group is replaced by PPh3 in [Cr(CO)6], which one of the following statement is TRUE? · Organometallic Compounds – General
ABC26IN0525 · [CpMoCl2]2 obeys the 18 electron rule. The correct structure of this compound is (atomic number of Mo = 42) · 18 Electron Rule
ABC26IN0526 · Among the given boranes and heteroboranes, the example which belongs to 'closo' type is · Cluster Compounds Wade Rules
ABC26IN0527 · The hapticity of cycloheptatriene, (C7 H8), in Mo (C7 H8)(CO)3 is ____ · Organometallic Compounds – General
ABC26IN0528 · The structure type and shape of the polyhedral (skeletal) framework of the carborane Me2C2B10H10, respectively, are · Organometallic Compounds – General
ABC26IN0529 · Based on Wade's rule, the structure-type of [B5 H8]-is · 18 Electron Rule
ABC26IN0530 · The reaction of equimolar quantities of Fe(CO)5 and OH-gives a complex species X which on further reaction with MnO2 give species Y. X and… · Organometallic Compounds – General
ABC26IN0531 · In the following reaction, the stereochemistry of the major product is predicted by the · Organometallic Compounds – General
ABC26IN0532 · The product obained in the reaction of Mn2(CO)10 with Br2 is · Organometallic Compounds – General
ABC26IN0533 · The correct molecular representation of W(Cp)2(CO)2 is (Cp=cyclopentadienyl) · Cluster Compounds Wade Rules
ABC26IN0534 · The CORRECT statement regarding the substitution of coordinated ligands in Ni(CO)4 and Co(NO)(CO)3 is: (Given: Co–N–O bond is nearly… · Organometallic Compounds – General
ABC26IN0537 · Among the following, [B12 H12]2-, [Ni5(CO)12]2-, [C2 B9 H11]2-, Rh6(CO)16, Os6(CO)20, B5 H11, B6 H10 the total number of species having… · Cluster Compounds Wade Rules
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 [ (eta 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 Å 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+q2)/pq and p q=p2/q 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 μA. When the… · 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 Na2EDTA is required to reach the end point. The concentration of CaCO3… · Analytical – General
ABC26PH0263 · The function eax2 (alpha > 0) is not an acceptable wave function for bound system, because · Atomic Structure – General
ABC26PH0264 · First order perturbation correction Delta varepsilon n(1) to energy level varepsilon n of a simple harmonic oscillator due to the… · Atomic Structure – General
ABC26PH0265 · The 2s orbital of H – atom has radial node at 2a0 because psi 2s 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
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 psi = C1(psi 2s+ psi 3s)/(√(2)) + C2(psi 2s- psi 3s)/(√(2)) where C1 and C2 are… · 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
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 psi m(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… · 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 psi = 0.89 phi convalent + 0.45 phi ionic. The chance that both electrons of the bond… · 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 energy… · 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/(varphi)). 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 m s-1 (typical speed at room temperature) is · Atomic Structure – General