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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
Explain the basis of similarities between metallic and ionic crystals.
Classify the following solids into different types:
a. Ammonium phosphate
b. Brass
c. S8 molecule
d. Diamond
Answer the following in brief.
Distinguish between ionic solids and molecular solids
A compound is made up of two elements X and Y and crystallizes in bcc structure. Atoms of X are present at the corners of the cube. Atoms of Y are present at the centre of the cube. The formula of the compound is ______.
Sodium crystallizes in bcc structure. If the edge length of unit cell is 4.3 × 10-8 cm, the radius of Na atom is ______.
Solid CO2 is an example of ____________.
Assertion: monoclinic sulphur is an example of a monoclinic crystal system
Reason: for a monoclinic system, a ≠ b ≠ c and α = γ = 90°, β ≠ 90°
Classify the following solid.
Diamond
If NaCl is doped with 10−2 mol percentage of strontium chloride, what is the concentration of cation vacancy?
Fullerene is an example of ____________.
Which among the following is NOT a polar molecular solid?
Which among the following is an example of network solid?
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 ____________.
What type of interaction hold the molecules together in a polar molecular solid?
In graphite electrons are ____________.
Which of the following is a network solid?
Which of the following is not the characteristic of ionic solids?
Which of the following cannot be regarded as molecular solid?
(i) SiC (Silicon carbide)
(ii) AlN
(iii) Diamond
(iv) I2
A crystal with a ≠ b ≠ c and α = β = γ = 90° is
Which of the following exists as covalent crystals in the solid state?
The covalent bond length is the shortest in which one of the following bonds?
The major binding force in diamond, silicon and quartz is ______.
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 ______.
Among the following which is the best description of water in the solid phase?
Graphite is a ______.
Mention the res of the following solid:
CO2
