Advertisements
Advertisements
प्रश्न
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 _______.
पर्याय
AB4
A3B
AB
AB3
Advertisements
उत्तर
'A' ions are at the centre of each face. There are six face centres and each contributes one half to the unit cell. Total number of A ions present per unit cell
`=6 xx 1/2 = 3`.
'B' ions occupy corners of the cube. There are 8 corners and each contributes one eight to the unit cell.
Total number of B ions present per unit cell
`=8xx1/8=1`.
The formula of a compound is A3B
Hence, the correct answer is A3B.
APPEARS IN
संबंधित प्रश्न
The major binding force in diamond is_______________ .
(a) Covalent bond
(b) Ionic bond
(c) Metallic bond
(d) Co-ordinate covalent bond
What is the covalency of nitrogen in N2O5?
Give an example each of a molecular solid and an ionic solid.
What type of solids are electrical conductors, malleable and ductile?
Explain the basis of similarities 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.
Distinguish between crystalline solids and amorsphous solids.
Classify the following molecular solids into different types:
- HCl
- CO2
- Solid ice
- SO2
Answer the following in brief.
Distinguish between ionic solids and molecular solids
Sodium crystallizes in bcc structure. If the edge length of unit cell is 4.3 × 10-8 cm, the radius of Na atom is ______.
Classify the following solid:
Pb
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 ____________.
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.
P4
Classify the following solid.
Diamond
Classify the following solid.
NaCl
Which of the following is an example of molecular solid?
____________ is an example of molecular crystal.
Dry ice is an example of ____________.
Fullerene is an example of ____________.
Which among the following is NOT a polar molecular solid?
Lithium crystallizes into body centered cubic structure. What is the radius of lithium if edge length of it's unit cell is 351 pm?
Which among the following is not true for crystalline solid?
Which among the following is an example of network 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 ____________.
Nature of binding forces present in carbon dioxide molecules in solid state are ____________.
Which among the following is an example of non-polar molecule?
MgO has the structure of NaCl. The coordination number of the ions in MgO is ____________.
The hardest substance among the following is:
The compound, found in nature in gas phase but ionic in solid state is ____________.
Among solids, the highest melting point is exhibited by ____________.
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
Which of the following is not true about the ionic solids?
A crystal with a ≠ b ≠ c and α = β = γ = 90° is
Who introduced the term covalent bond?
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 ______.
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?
Which of the following is not correct?
Graphite is a ______.
What are intermolecular forces of attraction involved in molecular crystals?
Quartz is which type of crystal?
