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The ferromagnetic material, CrO2, is used to make magnetic tapes used for audio recording. The property thus exhibited is called paramagnetism. They are magnetised in the same direction as that of the applied field. This property is shown by those substances whose atoms, ions or molecules contain unpaired electrons, e. These substances, however, lose their magnetism in the halobetasol propionate (Ultravate X Cream)- Multum of the magnetic field. Ferrimagnetism arises due to the unequal number of magnetic moments in opposite direction resulting in some net magnetic moment.

Antiferromagnetism is due to the presence of equal number of magnetic moments in the Serevent Diskus (Salmeterol Xinafoate)- Multum directions (v) 13-15 group compounds baby sex girl When the solid state materials are produced by combination of elements of groups 13 and 15, the compounds thus obtained are called 13-15 compounds.

For example, InSb, AlP, GaAs, etc. For example, ZnS, CdS, CdSe, HgTe, etc. In these compounds, the bonds have ionic character. Classify the following as amorphous active la roche crystalline solids: Polyurethane, naphthalene, benzoic acid, Teflon, potassium nitrate, cellophane, polyvinyl chloride, fibreglass, copper Ans: Crystalline solids: Benzoic acid, potassium nitrate, copper Amorphous solids: Polyurethane, Halobetasol propionate (Ultravate X Cream)- Multum, cellophane, polyvinyl chloride, fibreglass 1.

Therefore, the ionic solids become conducting 1. Classify each of the following as being either a p-type or n-type semiconductor : Ge doped with In B doped with Si. Solution: Ge is group 14 element and In is group 13 element. B is group 13 element and Si is group 14 element, there will be a free electron, So, it is an n-type semiconductor.

In terms of band theory, what is the difference between a conductor and an insulator between a conductor and a semiconductor. Solution: In most of the solids halobetasol propionate (Ultravate X Cream)- Multum in many insulating solids conduction takes place due to migration of electrons under the influence of electric field.

Explain the following terms with suitable examples : Schottky defect Frenkel defect Interstitial defect F-centres. How many unit cells are there in 1. Explain the following with suitable example: Ferromagnetism Paramagnetism Ferrimagnetism Antiferromagnetism 12-16 and 13-15 group compounds. Solution: (i) Ferromagnetic substances : Substances which are attracted very strongly by a magnetic field are halobetasol propionate (Ultravate X Cream)- Multum ferromagnetic substances, e.

Molecular solids: The constituent particles in these types of solids are either atoms or molecules. The atoms or molecules are held together by weak halobetasol propionate (Ultravate X Cream)- Multum of attraction.

Molecular solids are divided further into non-polar molecular solids, polar molecular solids, news astrazeneca hydrogen-bonded molecular solids. The atoms or molecules in these solids are held together by weak dispersion or London forces. These solids are non- conductors of electricity. EX: Solid sulphur dioxide and solid ad d acid.

The molecules in polar molecular solids are held together by relatively stronger dipole-dipole interactions. These solids have relatively high melting and boiling points. These solids are soft and non-conductors of electricity. EX: Ice and solid hydrofluoric acid The molecules in these solids are held together by strong forces of attraction called hydrogen bonds. These solids have high melting points.

These solids are also non-conductors of electricity. Ionic solids: These solids have the ions as their constituent particles. The columbic or electrostatic forces of attraction hold the ions - cations and anions - together in the crystal.



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