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प्रश्न
Define Anisotropy.
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उत्तर
The ability of crystalline solids to change values of physical properties when measured in different directions is called anisotropy.
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संबंधित प्रश्न
The major binding force in diamond is_______________ .
(a) Covalent bond
(b) Ionic bond
(c) Metallic bond
(d) Co-ordinate covalent bond
What type of solids are electrical conductors, malleable and ductile?
Account for the following :
o-nitrophenol is more steam volatile than p-nitrophenol.
How are the crystalline solids classified?
Answer the following in brief.
Distinguish between ionic solids and molecular solids
An ionic compound AxBy crystallizes in fcc type crystal structure with B ions at the centre of each face and A ion occupying corners of the cube. the correct formula of AxBy is
In calcium fluoride, having the flurite structure the coordination number of Ca2+ ion and F− Ion are ____________.
The ionic radii of A+ and B− are 0.98 × 10−10 m and 1.81 × 10−10 m. The coordination number of each ion in AB is ______.
Define unit cell.
Classify the following solid.
Brass
Classify the following solid.
Iodine
Which of the following is TRUE about molecular solids?
____________ is an example of molecular crystal.
Which among the following is NOT a polar molecular solid?
Brass is an example of ____________.
Solid X is a very hard electrical insulator in solid as well as in molten state. It melts at extremely high temperature. Solid X is a ____________.
Order of increasing melting points among H2O(s), C(s), CS2 and Sn is ____________.
Which among the following is an example of non-polar molecule?
Silicon carbide is an example of ____________.
Among solids, the highest melting point is exhibited by ____________.
How many chloride ions are surrounding sodium ions in sodium chloride crystal?
Which of the following cannot be regarded as molecular solid?
(i) SiC (Silicon carbide)
(ii) AlN
(iii) Diamond
(iv) I2
Which of the following exists as covalent crystals in the solid state?
A reddish-pink substance on heating gives off a vapour which condenses on the sides of the test tube and the substance turns blue. If on cooling water is added to the residue it turns to original colour. The substance is ______.
Mention the res of the following solid:
CO2
