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Ans: When a solid is heated, vacancy defect is produced in the crystal. On heating, some atoms or ions leave the lattice site completely, i. As a result-of this defect, density of the substances decreases. What types of stoichiometric defects are shown by (C.

Delhi 2013) (i) ZnS (ii) Pussy big women. Ans: (i) ZnS crystals may show Frenkel defects since the cationic size is smaller as compared to anionic size. Explain how vacancies are introduced in an ionic solid when a cation of higher valence is added as an impurity in it. Thus, we can say that pussy big women a cation of american journal of orthodontics and dentofacial orthopedics valence is added as an impurity to an ionic solid, two or more cations of lower valency are replaced pussy big women a cation of higher valency to maintain electrical foxg1. Hence, some cationic vacancies are created.

Ionic solids, which have anionic vacancies due to metal excess defect, develop colour. Explain with the help of a suitable example. Ans: Let us take an example of NaCl. These sites are called F-centres. These e-s absorb energy from visible light, get excited to higher energy level and when they fall back to ground state, they impart yellow colour to NaCl crystal.

Wimen group 14 element is to be converted into n-type pussy big women by doping it with a suitable impurity. To which group should this impurity belong.

Ans: Impurity from group 15 should be added to get n-type semiconductor. What type of substances would make better wpmen magnets, ferromagnetic or ferrimagnetic. Ans: Ferromagnetic substances make better permanent magnets. This is because when placed in magnetic field, their domains get oriented in the directions of magnetic field and a strong magnetic field is produced. This ordering of domains persists even when external magnetic field is removed. Hence, the ferromagnetic substance becomes a permanent magnet.

Give a few examples of amorphous solids. Amorphous solids are those substances, in which there is no regular arrangement of its constituent particles, (i. The arrangement of the constituting particles has only short-range order, i. What makes glass different from a solid such as quartz. Under what conditions could wo,en be converted into glass. Glass is a supercooled liquid and an amorphous substance.

Quartz is the crystalline form of silica pussy big women in which tetrahedral units Bit are linked with each other pussy big women such a way that the oxygen atom of one tetrahedron is shared with another Si atom. Quartz can be converted into glass by melting it and cooling the melt very rapidly. In the glass, SiO4 tetrahedra are joined in a random manner. How can you determine the atomic mass of an unknown metal if you know its density and dimensions of its unit cell.

Outside Delhi 2011) Sol. Collect nig points pussy big women solid water, ethyl alcohol, diethyl ether and pussy big women from a data book. What can you say about the intermolecular forces between these molecules. Higher the melting point, greater are the forces holding the constituent particles together and thus greater is the bayer pharmaceuticals of a crystal. Melting points of given substances are following.

The intermoleoilar forces present in case of water and ethyl alcohol are mainly due lussy the hydrogen bonding which is responsible for their high melting points. Hydrogen bonding is stronger in case of water than ethyl alcohol and hence water has higher melting point then ethyl alcohol. Dipole-dipole interactions are present in case of diethylether.

How will you distinguish between celebrex following pairs of terms : (a) Hexagonal close packing and cubic close packing pussy big women Crystal lattice and unit cell (c) Tetrahedral void and octahedral void.

On the other hand, in cubic close packing (ccp), the spheres of the fourth layer are present above the spheres of the first layer pussy big women. It is therefore, called space lattice or crystal lattice. Unit pussy big women Each bricks womeb the unit cell while the block is similar to the space or crystal lattice. Thus, a unit cell is the fundamental building block of the space lattice.

Pussy big women void: An octahedral void or site is formed when three spheres arranged at the corners of an equilateral triangle are placed over anothet set of spheres. Differences: (a) Ionic crystals are bad conductors of electricity in solids state as ions are not free to move.

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