Advertisements
Advertisements
प्रश्न
Explain the basis of similarities between metallic and ionic crystals.
Advertisements
उत्तर
- Ionic and metallic crystals are similar in that they both have non-directional bonds and electrostatic forces of attraction.
- Ionic crystals have electrostatic forces between oppositely charged ions, while metallic crystals have them between valence electrons and kernels.
- Both have extremely high melting points as a result.
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?
What type of solids are electrical conductors, malleable and ductile?
Classify the following solids into different types:
a. Ammonium phosphate
b. Brass
c. S8 molecule
d. Diamond
Account for the following :
o-nitrophenol is more steam volatile than p-nitrophenol.
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?
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.
Iodine
Select the INCORRECT match:
Which of the following is an example of molecular solid?
An AB2 type structure is found in ____________.
The major binding force of diamond, silicon and quartz is ____________.
Which one of the following forms a molecular solid when solidified?
Which of the following is a network solid?
Iodine molecules are held in the crystals lattice by ______.
How many chloride ions are surrounding sodium ions in sodium chloride crystal?
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?
Who introduced the term covalent bond?
Which of the following molecules is non-polar in nature?
Among the following which is the best description of water in the solid phase?
Which of the following is not correct?
Mention the res of the following solid:
Ice
Mention the res of the following solid:
CO2
What are intermolecular forces of attraction involved in molecular crystals?
