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Solid State

21 questions · Chemistry · IIT JAM
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Solid State

21 questions · Chemistry · IIT JAM

  1. Crystal system with the unit cell parameters a=b=c and α=β=γ=90∘ is2025 · Q4 · MCQ
  2. Correct statement(s) with respect to defects in solids is(are)2025 · Q40 · Multiple correct
  3. Wavelength of X-rays used in a diffraction experiment is 1.54 Å. X-rays are diffracted from a set of planes with an interplanar spacing of 1.54 Å. Then the angle θ (in degrees) corresponding to the first-order Bragg diffraction is2024 · Q5 · MCQ
  4. The unit cell of a two-dimensional square lattice with lattice parameter a is indicated by the dashed lines as shown below: The percentage (%) area occupied by the grey circles (of radius r) inside the unit cell is ​… Includes diagram2024 · Q57 · Numerical
  5. The separation (in nm) of {134} planes of an orthorhombic unit cell (with cell parameters a = 0.5 nm, b = 0.6 nm, and c = 0.8 nm) is2023 · Q23 · MCQ
  6. All possible lattice types are observed in the2022 · Q16 · MCQ
  7. The common point defect(s) in a solid is/are2022 · Q40 · Multiple correct
  8. The *d* spacing for the first-order X-ray (λ = 1.54 Å) diffraction event of metallic iron (*fcc*) at 2θ = 20.2° is ​ Å. (*round off to three decimal places*)2022 · Q48 · Numerical
  9. The volume fraction for an element in an *fcc* lattice is ​. (*round off to two decimal places*)2022 · Q49 · Numerical
  10. 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 unit cell in Å of the crystal (rounded off to one decimal place) is (Given:…2021 · Q25 · MCQ
  11. Calcium crystallizes in fcc lattice of unit cell length 5.56 Å and density 1.4848 g cm −3. The percentage of Schottky defects (rounded off to one decimal place) in the crystal is ​. (Given: Atomic mass of Ca…2021 · Q45 · Numerical
  12. Fullerene (C60​) crystallizes in an FCC unit cell (edge length = 14.14 Å) with one C60​ centered at each lattice point. The smallest distance (in Å) between the centers of two C60​ molecules is ​…2020 · Q43 · Numerical
  13. The ratio of the nearest neighbor atomic distances in body-centered cubic (bcc) and face-centered cubic (fcc) crystals with the same unit cell edge length is2019 · Q16 · MCQ
  14. 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 used is ​ pm. (Round off to one decimal place) [Given: Copper forms fcc…2019 · Q54 · Numerical
  15. The number of crystal systems and the number of Bravais lattices are, respectively,2018 · Q9 · MCQ
  16. Silver crystallizes in a face-centered cubic lattice. The lattice parameter of silver (in picometer) is [Given: Avogadro's number = 6.023 × 10²³ mol⁻¹, molar mass of silver = 107.87 g mol⁻¹ and density of crystal = 10.5 g cm⁻³]2017 · Q53 · Numerical
  17. 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 off to two decimal places)2017 · Q58 · Numerical
  18. The type(s) of interaction(s) that hold layers of graphite together is(are)2016 · Q37 · Multiple correct
  19. In a diffraction experiment with X-rays of wavelength 1.54 Å, a diffraction line corresponding to 2θ = 20.8° is observed. The inter-planar separation in Å is __.2016 · Q48 · Numerical
  20. The coordination numbers of Cs⁺ and Cl⁻ ions in the CsCl structure, respectively, are2016 · Q9 · MCQ
  21. At what angle(s) of incidence, X-rays of wavelength 5.0 Å will produce diffracted beam from the (110) planes in a simple cubic lattice with a=10 Å?2015 · Q39 · Multiple correct