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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
What type of solids are electrical conductors, malleable and ductile?
Explain The basis of similarities and differences between metallic and ionic crystals.
Copper crystallises into a fcc lattice with edge length 3.61 × 10−8 cm. Show that the calculated density is in agreement with its measured value of 8.92 g cm−3.
An ionic compound crystallises in FCC type structure with ‘A’ ions at the centre of each face and ‘B’ ions occupying corners of the cube. The formula of compound is _______.
Classify the following molecular solids into different types:
- HCl
- CO2
- Solid ice
- SO2
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 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
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 ____________.
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
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?
Select the INCORRECT match:
Dry ice is an example of ____________.
Fullerene is an example of ____________.
Which among the following is NOT a polar molecular solid?
Which among the following is not true for crystalline 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 ____________.
MgO has the structure of NaCl. The coordination number of the ions in MgO is ____________.
Solid CH4 is ____________.
An example of a covalent crystalline solid is ____________.
Among solids, the highest melting point is exhibited by ____________.
Which of the following exists as covalent crystals in the solid state?
In graphite electrons are ____________.
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.
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?
Who introduced the term covalent bond?
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 ______.
Which of the following molecules is non-polar in nature?
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?
Mention the res of the following solid:
Ice
What are intermolecular forces of attraction involved in molecular crystals?
Quartz is which type of crystal?
