425 questions from a source that prints this span of years rather than the year of each question. Each opens with its answer and explanation.
ABC26IN0743 · The isotope 84214 Po undergoes one alpha and one beta particle emission sequentially to form an isotope " X ". The number of neutrons in "… · Isotope Applications
ABC26IN0744 · A radioactive element undergoes 80 \% radioactive decay in 300 min. The half-life for this species in minutes is ____ · Radioactive Decay Kinetics
ABC26IN0745 · The decay modes of 14 C and 14 O are · Radioactive Decay Kinetics
ABC26IN0746 · 24 Na decays to one-fourth of its initial amount in 29.8 hours. Its decay constant is ____ hour -1 (rounded up to four decimal places). · Radioactive Decay Kinetics
ABC26IN0747 · A radioactive sample decays to 10 \% of its initial amount in 4600 minutes. The rate constant of this process is ____ hour -1 (Round off to… · Radioactive Decay Kinetics
ABC26IN0748 · For the following fusion reaction, 4 1 H 4 He+2 beta ++2 + gamma the Q-value (energy of the reaction) in MeV (rounded off to one decimal… · Fission Fusion
ABC26IN0749 · Metal-carbon multiple bonds in metal carbonyl are preferably identified from the stretching frequency of · Organometallics – General
ABC26IN0750 · B2 H6 and B4 H10, respectively, are examples of · Organometallics – General
ABC26IN0751 · Schematically represents orbital overlaps in metal carbonyls. Show the correct signs of the lobes. · Organometallics – General
ABC26IN0752 · The Correct order of CO vibrational stretching frequency in the following complexes is (I) (PF3 )3 Mo(CO)3 (II) (PCl3 )3 Mo(CO)3 (III)… · Organometallics – General
ABC26IN0753 · The carbonyl stretching frequency (vC=O ) is highest for: · Organometallics – General
ABC26IN0754 · The correct order of M-C(M=Ti, V, Cr and Mn) bond stretching frequency is: (Given: Atomic number of Ti=22, V=23, Cr=24 and Mn=25 ) · Organometallics – General
ABC26IN0755 · For the following reactions, the metal complexes X and Y are (i) Ni(s) [1 atm / 25 C]CO(g) X (ii) FeCl2 2 NaC5 H5 Y · Organometallics – General
ABC26IN0756 · Which of the following statement(s) is/are true about the transition metal-alkene complexes? · Organometallics – General
ABC26IN0757 · The value of 'x' in [Cu(CO)x ]+such that it obeys the 18 electron rule is · Organometallics – General
ABC26IN0758 · The correct order of vNO (cm-1 ) in the following compound is · Organometallics – General
ABC26IN0759 · The homogeneous catalyst used in water-gas shift reaction is · Organometallics – General
ABC26IN0760 · Among the following metal carbonyl species, the one with the highest metal-carbon back bonding is · Organometallics – General
ABC26IN0761 · The correct statement(s) about carbene is(are) · Organometallics – General
ABC26IN0762 · The correct option having one complex from each of the following pairs which is more reactive towards the oxidative addition reaction by… · Organometallics – General
ABC26IN0763 · The value of n for the complex [Fe(CO)4 (SiMe3 ) ]n satisfying the 18-electron rule is · Organometallics – General
ABC26IN0764 · Number of vertices in an icosahedral closo-borane is ____. · Organometallics – General
ABC26IN0765 · The order of the M-C bond strength in the following species is (Atomic number for Cr=24, Mn=25, Ti=22, Co=27 ) · Organometallics – General
ABC26IN0766 · The cage - type structure adopted by boron hydride [B5 H11 ], is · Organometallics – General
ABC26IN0767 · The complex which does NOT obey 18 - electron rule is (atomic number for Mn=25, Fe=26, Co=27, Ru=44 ) · Organometallics – General
ABC26IN0768 · The organometallic reagent(s) among the following is(are) · Organometallics – General
ABC26IN0769 · The CORRECT order of pKa for the compounds I to IV in water at 298 K is IHCo(CO)4 IIHCo(CO)3(PPh3) IIIHCo(CO)3(P(OPh)3) IVHCo(CO)2(PPh3)2 · Organometallics – General
ABC26IN0770 · The complex that does NOT obey the 18-electron rule is (Given: Atomic numbers of Ti, Mn, Ta and Ir are 22, 25, 73 and 77, respectively) · Organometallics – General
ABC26IN0771 · The decreasing order of C=C bond length in the following complexes is · Organometallics – General
ABC26IN0772 · The CORRECT statement(s) about the species is (are) · Organometallics – General
ABC26IN0773 · The structure types of B10 H10 2- and B10 H14, respectively, are · Organometallics – General
ABC26IN0774 · The order of increasing CO stretching frequencies in [Co(CO)4 ]-, [Cu(CO)4 ]+, [Fe(CO)4 ]2- and [Ni(CO)4 ] is · Organometallics – General
ABC26IN0775 · The number of CO stretching bands in the infrared spectrum of Fe(CO)5 is · Organometallics – General
ABC26IN0776 · The reaction involve(s) · Organometallics – General
ABC26IN0777 · For Na+, Mg2+, Al3+ and F-, the CORRECT order of ionic radii is · Periodic Properties – General
ABC26IN0778 · Two sets of quantum numbers with the same number of radial nodes are · Periodic Properties – General
ABC26IN0779 · With respect to periodic properties, the CORRECT statement is · Periodic Properties – General
ABC26IN0780 · Which of the following set(s) of quantum numbers is (are) NOT allowed? · Periodic Properties – General
ABC26IN0781 · The correct order of the boiling points of the compounds is · Periodic Properties – General
ABC26IN0782 · Among the following, the compound that has the lowest degree of ionic character is · Periodic Properties – General
ABC26IN0783 · The common feature(s) of Rb+, Kr and Br-is/are that they · Periodic Properties – General
ABC26IN0784 · The energy of an electron in a hydrogenic atom with nuclear charge Z varies as: · Periodic Properties – General
ABC26IN0785 · Among the following, the element having maximum inert pair effect is [Given: Atomic number of Ge=30, Pb=82, Si=14 and Sn=50 ] · Periodic Properties – General
ABC26IN0786 · The pair of semimetals in the following is: · Periodic Properties – General
ABC26IN0787 · The correct order of acidic character is: · Periodic Properties – General
ABC26IN0788 · Among lithium, nitrogen, carbon and oxygen, which element has the highest first ionization potential? · Periodic Properties – General
ABC26IN0789 · Which one of the following has the highest lattice energy? · Periodic Properties – General
ABC26IN0790 · The acceptable valence shell electronic arrangement is: · Periodic Properties – General
ABC26IN0791 · Identify the correct option: In the periodic table, on moving from left to right along a period, · Periodic Properties – General
ABC26IN0792 · The correct order of the mean bond energies in the binary hydrides is: · Periodic Properties – General