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प्रश्न
Define unit cell.
उत्तर
A basic repeating structural unit of a crystalline solid is called a unit cell.
संबंधित प्रश्न
What is the covalency of nitrogen in N2O5?
Give an example each of a molecular solid and an ionic solid.
Ionic solids conduct electricity in molten state but not in solid state. Explain
Explain The basis of similarities and differences between metallic and ionic crystals.
Explain Ionic solids are hard and brittle.
Distinguish between crystalline solids and amorsphous solids.
Define Anisotropy.
Answer the following in one or two sentences.
What are the types of particles in each of the four main classes of crystalline solids?
Answer the following in one or two sentences.
A solid is hard, brittle and electrically nonconductor. Its melt conducts electricity. What type of solid is it?
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 ______.
A compound crystallizes in bcc structure. What is unit cell edge length if diameter of its atom is 120 pm?
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
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°
In calcium fluoride, having the flurite structure the coordination number of Ca2+ ion and F− Ion are ____________.
Give any three characteristics of ionic crystals.
Differentiate crystalline solids and amorphous solids.
Classify the following solid.
Brass
Classify the following solid.
NaCl
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?
Dry ice 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 ____________.
Ionization enthalpy is lowest in ____________.
Which among the following is an example of non-polar molecule?
Silicon carbide is an example of ____________.
The compound, found in nature in gas phase but ionic in solid state is ____________.
In graphite electrons are ____________.
Which one of the following forms a molecular solid when solidified?
How many chloride ions are surrounding sodium ions in sodium chloride crystal?
Which of the following is not true about the ionic solids?
Which of the following cannot be regarded as molecular solid?
(i) SiC (Silicon carbide)
(ii) AlN
(iii) Diamond
(iv) I2
Why are liquids and gases categorised as fluids?
Inspite of long range order in the arrangement of particles why are the crystals usually not perfect?
A crystal with a ≠ b ≠ c and α = β = γ = 90° is
The covalent bond length is the shortest in which one of the following bonds?
Calculate the angle at which first order reflection will occurs in an X-ray spectrometer when x ~ rays of wavelength \[\ce{1.54 \overset{\circ}{A}}\] are diffracted by the atoms of a crystal given that inter planer distance is \[\ce{0.04 \overset{\circ}{A}}\]
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?
Which of the following is not correct?
Graphite is a ______.
Mention the res of the following solid:
CO2
What are intermolecular forces of attraction involved in molecular crystals?
Quartz is which type of crystal?
