Trying to find the right answer to this..

Previous Year Papers

Download Solved Question Papers Free for Offline Practice and view Solutions Online.

Test Series

Take Zigya Full and Sectional Test Series. Time it out for real assessment and get your results instantly.

Test Yourself

Practice and master your preparation for a specific topic or chapter. Check you scores at the end of the test.

The Solid State

Short Answer Type

21. What type of stoichiometric defect is shown by
(i) ZnS, (ii) AgBr (iii) KCl

589 Views

22. Explain how vacancies are introduced in an ionic solid when a cation of higher valence is added as an impurity in it.

189 Views

23. Ionic solids, which have anionic vacancies due to metal excess defect, develop colour. Explain with the help of a suitale example.

When crystals of NaCl are heated in an atmosphre of sodium vapour, the sodium atoms are deposited on the surface of the crystal. The CI^– ions diffuse to the surface of the crystal and combine with Na atoms to give NaCl. This happens by loss electron by sodium atom to form Na⁺ ions. The released electrons diffuse into the crystals and occupy anionic sites. As a result the crystal now has an excess of sodium. They impart yellow colour to the crystals of NaCl.

207 Views

24. A group 14 element is to be converted into N-type semi-conductor by doping it with a suitable impurity. To which group should this impurity belong?

160 Views

25. What type of substances would make better permanent magnets, ferromagnetic or ferrimagnetic, justify your answer.

207 Views

26. how many the number of tetrahedral and octahedral voids are present in a cubic close packed structure of A spheres?

983 Views

27. What would be the number of tetrahedral and octahedral voids,In a face centred cubic unit cell (i.e., ccp structure) 4 atoms/ions are present?

304 Views

28. What type of point defect in a crystal of zinc sulphate?

362 Views

29. A cubic solid is made of two elements Y and Z. Atoms of Z are at the corners of the cube and Y at the body centre. What is the formula of the compound?

336 Views

30. MgO has rock salt type structure. What is the co-ordination number of each ion?

352 Views