235 questions from a source that prints this span of years rather than the year of each question. Each opens with its answer and explanation.
ABC26PH0781 · If is the eigenfunction to the Hamiltonian operator with alpha as the eigenvalue, then alpha MUST be · Postulates Operators
ABC26PH0782 · A quantum mechanical particle of mass m free to rotate on the surface of a sphere of radius r is in the state with energy 10 2mr2. The… · Quantum Chemistry – General
ABC26PH0783 · An atomic orbital is described by the wavefunction (r)=1 pi a03 e^- (ra0 ), where a0 is the Bohr radius. Given: d =r2 theta drd theta d phi… · Hydrogen Atom
ABC26PH0784 · The function y=x (-x2 ) has a minimum at x=-1√(2). The second derivative of the function at the minimum is · Quantum Chemistry – General
ABC26PH0785 · For unnormalized wave-function, (r, theta , phi )= theta phi (2 ra0- (ra0 ) ) (-ra0 ), the number of radial node(s) is ____ · Hydrogen Atom
ABC26PH0786 · [-h2 (8 pi 2 m ) dd x2+h2 alpha 2 x2 (2 pi 2 m ) ] (- alpha x2 )=C h2 (4 pi 2 ) (- alpha x2 ), where h, pi , m and alpha are constants… · Quantum Chemistry – General
ABC26PH0787 · If x=x px=h/(2 pi i) d/dx, then the value(s) of px x-x px is/are · Quantum Chemistry – General
ABC26PH0788 · The maximum of a function Ae^-ax2(A>0 ; a>0) is at x= · Quantum Chemistry – General
ABC26PH0789 · The 3 pz orbital has · Hydrogen Atom
ABC26PH0790 · For a particle in one-dimensional box of length L with potential energy V(x)=0 for L>x>0 and V(x)= for x L and x 0 an acceptable wave… · Particle In A Box
ABC26PH0791 · Which of the following set(s) of quantum numbers is (are) NOT allowed? · Quantum Chemistry – General
ABC26PH0792 · The function f(x)=xe^-x2 has a minimum at · Quantum Chemistry – General
ABC26PH0793 · The eigenvalue(s) of the matrix [arrayll 1 & 2 \\ 2 & 1 array ] is/are · Quantum Chemistry – General
ABC26PH0794 · Two sets of quantum numbers with the same number of radial nodes are · Hydrogen Atom
ABC26PH0795 · The potential for a particle in a one-dimensional box is given as: V(x)=0 for 0 x L, and V(x)= elsewhere. The locations of the internal… · Postulates Operators
ABC26PH0796 · The number of P=O bonds present in the tetrabasic acid H4 P2 O7 is: · Redox Reaction – General
ABC26PH0797 · Indicator used in redox titration is · Redox Reaction – General
ABC26PH0798 · The number of S-S bond(s) in tetrathionate ion is ____ . · Redox Reaction – General
ABC26PH0799 · The volume of 0.3 M ferrous ammonium sulphate solution required for the completion of redox titration with 20 mL of 0.1 M potassium… · Redox Reaction – General
ABC26PH0800 · The number of lone pairs present in phosphonic acid (phosphorus acid) is · Redox Reaction – General
ABC26PH0801 · The value of 'n' in [Pn O18 ]6- is ____ · Redox Reaction – General
ABC26PH0802 · The volume of 1 N KMnO4 required to reach equivalence point in the titration with 0.01 mole of ferrous oxalate dissolved in dilute H2 SO4 is · Redox Reaction – General
ABC26PH0803 · Monochromatic X-rays having energy 2.8 10-15 J diffracted (first order) from (200) plane of a cubic crystal at an angle 8.5 . The length of… · Solid State – General
ABC26PH0804 · Calcium crystallizes in fcc lattice of unit cell length 5.56 and density 1.4848 g cm-3. The percentage of Schottky defects (rounded off to… · Solid State – General
ABC26PH0805 · MgO crystallizes as rock salt structure with unit cell length 2.12 . From electrostatic model, the calculated lattice energy in kJ mol-1… · Solid State – General
ABC26PH0806 · Fullerene (C60 ) crystallizes in an FCC unit cell (edge length =14.14 ) with one C60 centered at each lattice point. The smallest distance… · Solid State – General
ABC26PH0807 · The ratio of the nearest neighbour atomic distances in body-centered cubic (bcc) and face-centered cubic (fcc) crystals with the same unit… · Solid State – General
ABC26PH0808 · A first order reflection of X-ray from [220] plane of copper crystal is observed at a glancing angle of 22°. The wavelength of the X-ray… · Solid State – General
ABC26PH0809 · The number of crystal systems and the number of Bravais lattices are, respectively, · Solid State – General
ABC26PH0810 · Silver crystallizes in a face-centered cubic lattice. The lattice parameter of silver (in picometer) is ____ [Given: Avogadro's number… · Solid State – General
ABC26PH0811 · The separation of 123 planes (in nm) in an orthorhombic cell with a=0.25 nm, b=0.5 nm and c=0.75 nm is ____ (final answer should be rounded… · Solid State – General
ABC26PH0812 · The coordination numbers of Cs+and Cl-ions in the CsCl structure, respectively are · Solid State – General
ABC26PH0813 · In a diffraction experiment with X-rays of wavelength 1.54 , a diffraction line corresponding to 2 theta =20.8 is observed. The… · Solid State – General
ABC26PH0814 · The potential energy of interaction between two ions in an ionic compound is given by U=1389.4 [Z1 Z2r / ] kJ mol-1. Assuming that CaCl2 is… · Solid State – General
ABC26PH0815 · At what angle(s) of incidence, X-rays of wavelength 5.0 will produce diffracted beam from the (110) planes in a simple cubic lattice with… · Solid State – General
ABC26PH0816 · The ionic radii of Cs2+ and Cl-ions are 181 and 167 pm, respectively. The Born exponents for the He, Ne, Ar, Kr and Xe configurations are… · Solid State – General
ABC26PH0817 · A first order reflection from (111) plane is observed for LiX with 2 theta =24.6 (X-ray of wavelength 1.54 ). Assuming LiX to be a cubic… · Solid State – General
ABC26PH0818 · A hypothetical element ( atomic weight =300) crystallizes in a simple cubic lattice. For this crystal, the first order X-ray diffraction… · Solid State – General
ABC26PH0819 · The lattice energy of LiF calculated from Born-Lande equation -1000 kJ mol-1. Assume that for both LiF and MgO the Madelung constants… · Solid State – General
ABC26PH0820 · Draw the unit cell structure of NaCl. Calculate the limiting radius ratio of any ionic solid having NaCl like structure. · Solid State – General
ABC26PH0821 · The structure of rock salt consists of · Solid State – General
ABC26PH0822 · Draw a properly labeled unit cell diagram of CsCl. Show through calculations that there is only one CsCl per unit cell. · Solid State – General
ABC26PH0823 · The unit cell of diamond can be obtained from the unit cell of · Solid State – General
ABC26PH0824 · In CsCl structure, the number of Cs+ions that occupy second nearest neighbour locations of a Cs+ion is: · Solid State – General
ABC26PH0825 · The ionic radii of Ca2+ and F-are 100 pm and 133 pm respectively. The coordination number of Ca2+ in the ionic solid will be · Solid State – General
ABC26PH0826 · Draw the unit cell of CsCl lattice. Draw the (100) and (110) places separately and indicate the position of ceasium and chloride ions. · Solid State – General
ABC26PH0827 · Justify the following · Thermodynamics & Thermochemistry – General
ABC26PH0828 · A system undergoes two cyclic processes 1 and 2. Process 1 is reversible and process 2 is irreversible. The correct statement relating to… · Thermodynamics & Thermochemistry – General
ABC26PH0829 · For a cyclic process performed by an ideal gas, changes in some thermodynamic functions are zero. Indicate the set in which all the… · Thermodynamics & Thermochemistry – General
ABC26PH0830 · 5(a) When an ideal monoatomic gas is expanded adiabatically from 1.5 bar, 24.8 L and 298 K into an evacuated container, the final volume… · Thermodynamics & Thermochemistry – General