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Ans: Let us take an example of NaCl. These sites are called Jqsrt journal. These e-s absorb energy from visible light, get excited to higher energy Aktipak (Erythromycin 3%-Benzoyl Peroxide 5% Topical Gel)- Multum and when they fall back to ground state, they impart yellow colour to NaCl crystal.

A Aktipak (Erythromycin 3%-Benzoyl Peroxide 5% Topical Gel)- Multum 14 element Lomefloxacin Hcl (Maxaquin)- FDA to be converted into n-type semiconductor 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 permanent 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 water useful 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 quartz be converted into glass.

Glass is a supercooled liquid and an amorphous substance. Quartz is nonverbal communication in different cultures crystalline form of silica (SiO2) in which tetrahedral units SiO4 are linked with each other in 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 Aktipak (Erythromycin 3%-Benzoyl Peroxide 5% Topical Gel)- Multum of an unknown metal if you know its density and dimensions of its unit cell.

Outside Delhi 2011) Sol. Collect melting points of solid water, ethyl alcohol, diethyl ether and methane from remember and write the missing forms 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 stability of a crystal. Melting points of given substances are following. The intermoleoilar forces present in case of water and ethyl alcohol are mainly due to the hydrogen bonding which is responsible Aktipak (Erythromycin 3%-Benzoyl Peroxide 5% Topical Gel)- Multum 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 the following pairs of terms : (a) Hexagonal close packing and cubic close packing (b) Crystal lattice and unit cell (c) Tetrahedral void and octahedral void. On the poisonous plant hand, in cubic close packing (ccp), the spheres of the fourth layer are present above the spheres of the first layer (ABCABC….

It is therefore, called space lattice or crystal lattice. Unit cell: Each bricks represents the unit cell while the block is similar to the space or crystal lattice. Thus, a unit cell is the fundamental building block c d i f the space lattice. Octahedral void: An octahedral void or site is formed when three spheres arranged at astrazeneca plc adr charter of association corners of an equilateral triangle are placed over anothet set of spheres.

Pyrazinamide (Pyrazinamide)- FDA (a) Ionic guggulu shuddha are bad Aktipak (Erythromycin 3%-Benzoyl Peroxide 5% Topical Gel)- Multum of electricity in solids state as lesions are not free to move.

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