NEET Chemistry The Solid State Online Test Set D

1. In a calcium fluoride structure, the co-ordination number of cation and anion is respectively.

2. In which of the following defect density increases?

3. A given metal crystallizes out with a cubic structure having edge length of 361 pm. If there are four metal atoms in one unit cell, what is the radius of one atom?

4. A compound formed by elements X and Y crystallizes in a cubic structure in which the X atoms are at the corners of a cube and the Y atoms are at the face-centres. The formula of the compound is

5. Coordination number in ABAB... type arrangement is

6. The pyknometric density of sodium chloride crystal is 2.165 x 10³ kg m^-3 while its X-ray density is 2.178 x 10³ kgm^-3. The fraction of unoccupied sites in sodium chloride crystal is

7. In cube of any crystal A-atom placed at every corners and B-atom placed at every centre of face. The formula of compound

8. In crystals of which one of the following ionic compounds would you expect maximum distance between centres of cations and anions?

9. The second order Bragg diffraction of X-rays with λ=1.00˚A from a set of parallel planes in a metal occurs at an angle of 60^o. The distance between the scattering planes in the crystal is (in ˚A)

10. The edge length of rock salt type unit cell is 508 pm. If the radius of the cation is 110 pm, the radius of the anion assuming NaCl type structure is

11. An element (atomic mass = 100 gm/mol) having BCC structure has unit cell edge 400 pm. The density of element is

12. Schottky defect in crystals is observed when

13. The intermetallic compound LiAg crystallizes in cubic lattice in which both lithium and silver have coordination number of eight. The crystal class is

14. If we mix a pentavalent impurity in a crystal lattice of germanium, what type of semiconductor formation will occur?

15. The number of atoms in 100 g of an FCC crystal with density d = 10 g/cm³ and cell edge equal to 100 pm, is equal to

16. Ionic solids, with Schottky defects, contain in their structure

17. In a face-centered cubic lattice, a unit cell is shared equally by how many unit cells?

18. CsBr crystallises in a body centred cubic lattice. The unit cell length is 436.6 pm. Given that the atomic mass of Cs = 133 and that of Br = 80 amu and Avagadro number being 6.02 ÌÑ 10²³ mol^-1, the density of CsBr is

19. The appearance of colour in solid alkali metal halides is generally due to

20. If NaCl is doped with 10^-4 mol % SrCl₂ , the concentration of cation vacancies will be (N_A= 6.02ÌÑ10²³ mol^-1)

21. The fraction of total volume occupied by the atoms present in a simple cube is

22. Which of the following statements is not correct ?

23. With which one of the following elements silicon should be doped so as to give p-type of semiconductor ?

24. Percentage of free space in a body centred cubic unit cell is

25. If 'a' stands for the edge length of the cubic systems : simple cubic, body centred cubic and face centred cubic, then the ratio of radii of the spheres in these systems will be respectively

26. Copper crystallises in a face-centred cubic lattice with a unit cell length of 361 pm. What is the radius of copper atom in pm ?

27. Lithium metal crystallises in a body centred cubic crystal. If the length of the side of the unit cell of lithium is 351 pm, the atomic radius of the lithium will nearly be

28. A solid compound XY has NaCl structure. If the radius of the cation is 100 pm, the radius of the anion (Y^-) will be

29. AB crystallizes in a body centred cubic lattice with edge length 'a' equal to 387 pm. The distance between two oppositively charged ions in the lattice is

30. Among the following which one has the highest cation to anion size ratio?