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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
Ionic solids conduct electricity in molten state but not in solid state. Explain
Classify the following solids into different types:
a. Ammonium phosphate
b. Brass
c. S8 molecule
d. Diamond
Sodium crystallizes in bcc structure. If the edge length of unit cell is 4.3 × 10-8 cm, the radius of Na atom is ______.
Graphite and diamond are ____________.
Classify the following solid.
P4
Classify the following solid.
Brass
Classify the following solid.
Iodine
If NaCl is doped with 10−2 mol percentage of strontium chloride, what is the concentration of cation vacancy?
Which of the following is an example of molecular solid?
____________ is an example of molecular crystal.
Which among the following is NOT a polar molecular 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 ____________.
Nature of binding forces present in carbon dioxide molecules in solid state are ____________.
The compound, found in nature in gas phase but ionic in solid state is ____________.
The major binding force of diamond, silicon and quartz is ____________.
In graphite electrons are ____________.
Graphite cannot be classified as ______.
Which of the following cannot be regarded as molecular solid?
(i) SiC (Silicon carbide)
(ii) AlN
(iii) Diamond
(iv) I2
NaCl type crystal (with coordination no. 6 : 6) can be converted into CsCl type crystal (with coordination no. 8 : 8) by applying ____________.
How many chloride ions are surrounding sodium ions in sodium chloride crystal?
Which of the following is not true about the ionic solids?
An excess of potassium ions makes KCl crystals appear violet or lilac in colour since:
(i) some of the anionic sites are occupied by an unpaired electron.
(ii) some of the anionic sites are occupied by a pair of electrons.
(iii) there are vacancies at some anionic sites.
(iv) F-centres are created which impart colour to the crystals.
Why are liquids and gases categorised as fluids?
Which of the following exists as covalent crystals in the solid state?
Which of the following molecules is non-polar in nature?
