The Solid State in chemistry

Updated on March 30, 2021 10:22 AM IST by Lakshmi Arya

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Related FAQs

Q. Why are crystalline solids anisotropic?

Ans: Crystalline solids are anisotropic in nature because of different arrangements of particles in different directions. Some of their physical properties like electrical conductivity, refractive index, e... read more

Q. Why some of the glass objects recovered from ancient monuments look milky instead of being transparent ?

Ans: Some of the glass objects from ancient monuments look milky instead of being transparent because it undergoes heating during the day and cooling at night i.e., annealing over a number of years. As a r... read more

Q. Give an example each of a molecular solid and an ionic solid.

Ans: Example of molecular solid and an ionic solid:-- Molecular solids: HCl, SO2, H2O Ionic solids: KCl, CuSO4, ZnS... read more

Q. Write a feature which will distinguish a metallic solid from an ionic solid.

Ans: Metallic solids are malleable and ductile whereas ionic solids are hard and brittle. In solid state, ionic solids are electrical insulators because ions are not free to move about, e.g. NaCl, Na2... read more

Q. Stability of a crystal is related to the magnitude of its melting point. How?

Ans: The crystalline solids have sharp melting points. Melting point of a solid is related to the force of attraction between its molecules. Higher the melting point of a crystalline substance, greater is ... read more

Q. How will you distinguish between the following pair of terms : Crystal lattice and unit cell?

Ans: Crystal lattice:-- It is a regular three dimensional arrangement of atoms, ions or molecules. Unit cell:-- The smallest repeating unit which represents arrangement of lattice points in a crystal latt... read more

Q. An element with density 11.2 g cm^-3 forms a fcc lattice with edge length of 4 × 10^-8 cm. Calculate the atomic mass of the element. (Given: NA = 6.022 × 10^23 mol^-1)

Ans: It is given that d = 11.2 g cm-3, Z = 4, a = 4 × 10-8 cm, NA = 6.022 × 1023 mol-1 As we know that M = (d x a x NA) / Z M = (11.2 x (4×10-8)3 x  6.022 × 1023 ) / 4&... read more

Q. A copper crystal has a face centred cubic lattice structure. Atomic radius of the copper atom is 128 pm. Calculate the density of copper. Atomic mass of copper = 63.5

Ans: For fcc, Z = 4 r = 128 pm M = 63.5 As r = a / 2√2 a = 2√2r a = 2 × 1.414 × 128 pm = 362 pm a = 362 × 10-10 cm As d = (Z x M) / (a3 x NA) d = (4 x 63.5) / ((362 ... read more

Q. Which point defect in crystals does not alter the density of the relevant solid?

Ans: Frenkel defect in crystals does not alter the density of the relevant solid.... read more

Q. Which point defect in its crystal units alters the density of a solid?

Ans: Schottky defect alters the density of a solid.... read more

Q. How do metallic and ionic substances differ in conducting electricity?

Ans: Metals are conducting due to free electrons while in ionic substances the conductivity is due to presence of ions.... read more

Q. Write a point of distinction between a metallic solid and an ionic solid other than metallic lustre.

Ans: Metallic solids :  Metallic solids are conductors of electricity in solid state as well as in molten state as the metal atoms are held together through the metallic bond where the electrons are f... read more

Q. Based on the nature of intermolecular forces, classify the following solids: Benzene, Silver

Ans: Based on the nature of intermolecular forces Benzene:- Molecular solid Silver:- Metallic solid... read more