ABC26PH0517 · The incorrect statement for solid sodium chloride is that · 2005-2021
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… · 2001-2022self-practice
ABC26PH0518 · The atomic radius (in cm) of an element with a body centered cubic unit cell of volume 75.8 cm3 mol-1, molecular weight 137.3 and density… · 2005-2021
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… · 2001-2022self-practice
ABC26PH0519 · The arrangement of sulphur in zinc blende and wurtzite structures, respectively, are · 2005-2021
ABC26PH0805 · MgO crystallizes as rock salt structure with unit cell length 2.12 . From electrostatic model, the calculated lattice energy in kJ mol-1… · 2001-2022self-practice
ABC26PH0520 · The lattice parameters for a monoclinic crystal are: · 2005-2021self-practice
ABC26PH0806 · Fullerene (C60 ) crystallizes in an FCC unit cell (edge length =14.14 ) with one C60 centered at each lattice point. The smallest distance… · 2001-2022self-practice
ABC26PH0521 · When NiO is heated with a small amount of Li2 O in air at 1200 C, a non - stoichiometric compound Lix Ni(1 x) O is formed. This compound is · 2005-2021
ABC26PH0807 · The ratio of the nearest neighbour atomic distances in body-centered cubic (bcc) and face-centered cubic (fcc) crystals with the same unit… · 2001-2022
ABC26PH0522 · The condition for observing diffraction from the nickel surface is · 2005-2021self-practice
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… · 2001-2022self-practice
ABC26PH0523 · The minimum value of (V) for the electron to diffract from the (100) planes is · 2005-2021
ABC26PH0809 · The number of crystal systems and the number of Bravais lattices are, respectively, · 2001-2022self-practice
ABC26PH0524 · The X-ray powder pattern of NaCl shows an intense cone at theta =15.87 using X-rays of wave length 1.54 10-8 cm. The spacing between the… · 2005-2021
ABC26PH0810 · Silver crystallizes in a face-centered cubic lattice. The lattice parameter of silver (in picometer) is ____ [Given: Avogadro's number… · 2001-2022self-practice
ABC26PH0525 · The reducible representation corresponding to the three translational degrees of freedom, , is: · 2005-2021
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… · 2001-2022self-practice
ABC26PH0526 · The asymmertric stretching mode of the H2 O is shown below. The molecular plane is yz and the symmetry axis of H2 O is z . This vibration… · 2005-2021
ABC26PH0812 · The coordination numbers of Cs+and Cl-ions in the CsCl structure, respectively are · 2001-2022self-practice
ABC26PH0527 · Band theory predicts that magnesium is an insulator. However, in practice it acts as a conductor due to · 2005-2021
ABC26PH0813 · In a diffraction experiment with X-rays of wavelength 1.54 , a diffraction line corresponding to 2 theta =20.8 is observed. The… · 2001-2022self-practice
ABC26PH0528 · The band structure in an n-type semiconductor is · 2005-2021
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… · 2001-2022self-practice
ABC26PH0529 · For a face centered cubic lattice, the Miller indices for the first Bragg's peak (smallest Bragg angle) are · 2005-2021
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… · 2001-2022
ABC26PH0530 · A crystal has the lattice parameters a b c and alpha = beta = gamma =90 . The crystal system is · 2005-2021
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… · 2001-2022self-practice
ABC26PH0531 · A metal crystallizes in the face - centered cubic lattice parameter of 4.20 . The shortest atom to atom contact distance in the lattice is · 2005-2021
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… · 2001-2022self-practice
ABC26PH0532 · Molybdenum crystallizes in a bcc structure with unit cell dimensions of 0.314 nm. considering the atomic mass of molybdenum to be 96 , its… · 2005-2021
ABC26PH0533 · Which one of the following statements is INCORRECT? · 2005-2021
ABC26PH0818 · A hypothetical element ( atomic weight =300) crystallizes in a simple cubic lattice. For this crystal, the first order X-ray diffraction… · 2001-2022self-practice
ABC26PH0534 · The distance between two successive (110) planes in a simple cubic lattice with lattice parameter 'a' is · 2005-2021
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… · 2001-2022self-practice
ABC26PH0535 · When crystals of sodium chloride are heated in the presence of sodium vapor, they turn yellow. This is due to the formation of · 2005-2021
ABC26PH0820 · Draw the unit cell structure of NaCl. Calculate the limiting radius ratio of any ionic solid having NaCl like structure. · 2001-2022self-practice
ABC26PH0536 · The band structure given below represent a · 2005-2021
ABC26PH0821 · The structure of rock salt consists of · 2001-2022
ABC26PH0537 · The energy band diagram for magnesium is (The hatched and unhatched regions in the figure correspond to filled and unfilled regions of the… · 2005-2021
ABC26PH0822 · Draw a properly labeled unit cell diagram of CsCl. Show through calculations that there is only one CsCl per unit cell. · 2001-2022self-practice
ABC26PH0538 · P, F and I represent primitive, face - centered and body - centered lattices, respectively. The lattice types of NaCl and CsCl… · 2005-2021
ABC26PH0823 · The unit cell of diamond can be obtained from the unit cell of · 2001-2022
ABC26PH0539 · The INCORRECT statement about the solid-state structure of CsCl and CaF2 is: · 2005-2021
ABC26PH0824 · In CsCl structure, the number of Cs+ions that occupy second nearest neighbour locations of a Cs+ion is: · 2001-2022
ABC26PH0540 · For a cubic crystal system, the powder X-ray diffraction pattern recorded using Cu K alpha soucrce ( lambda =1.54 ) shows a peak at 33.60… · 2005-2021self-practice
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 · 2001-2022
ABC26PH0541 · Consider that AgX crystallizes in rock salt structure. The density of AgX is 6477\,kg/m3 and unit cell length is 577.5 pm. Atomic weight of… · 2005-2021self-practice
ABC26PH0826 · Draw the unit cell of CsCl lattice. Draw the (100) and (110) places separately and indicate the position of ceasium and chloride ions. · 2001-2022self-practice
X Ray Diffraction Bragg
ABC26PH1333 · A plane of spacing 'd' shows first order Bragg diffraction at angle theta . A plane of spacing 2d · JUNE 2013