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
Ionic solids conduct electricity in molten state but not in solid state. Explain
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
Account for the following :
o-nitrophenol is more steam volatile than p-nitrophenol.
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?
Graphite and diamond are ____________.
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°
Classify the following solid.
Brass
Which of the following is an example of molecular solid?
Which of the following is TRUE about molecular solids?
Fullerene is an example of ____________.
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?
London forces are present in ____________.
MgO has the structure of NaCl. The coordination number of the ions in MgO is ____________.
An AB2 type structure is found in ____________.
The compound, found in nature in gas phase but ionic in solid state is ____________.
An example of a covalent crystalline solid is ____________.
Which of the following exists as covalent crystals in the solid state?
In graphite electrons are ____________.
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?
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?
Quartz is which type of crystal?
