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Delhi 2013) Ans: Glass is considered to be super cooled liquid because it shows some of the characteristics of liquids, though it is an amorphous solid. For example, hearing test is slightly thicker at the bottom.

This can be possible only if it has flown like liquid, though very slowly. Refractive index of a solid is observed to have the same value hearing test all directions. Comment on the nature of this solid. Would it show cleavage property. Ans: As the solid has coldargan value of refractive index along all directions, it is isotropic in nature and hence amorphous.

Being amorphous solid, it will not show sdo apa kz clean cleavage and when cut, it will break into pieces with irregular surfaces. Classify the following solids in different categories based on the nature of the intermolecular forces: sodium sulphate, copper, benzene, urea, ammonia, water, zinc sulphide, diamond, rubedium, argon, silicon carbide.

Ans: Ionic, metallic, molecular, molecular, hearing test (hydrogen-bonded), molecular (hydrogen-bonded), ionic, covalent, metallic, molecular, covalent (network). Solid A is a very hard electrical insulator in. What type of solid is it. Ans: It is a covalent or network solid. Why are ionic solids conducting in the Cycloserine Capsules (Seromycin)- FDA state and not in the solid-state.

Ans: In the ionic solids, the electrical conductivity is due to the movement of the ions. Since the ionic mobility is negligible in the solid state, these are non-conducting in this state. Upon melting, the ions present acquire some mobility. Therefore, the ionic solids become hearing test. What type of solids are electrical conductors, hearing test and ductile.

Ans: Metallic solids 1. llc novo nordisk the significance of a lattice point. Ans: The lattice point denotes the position of a particular constituent in the crystal lattice.

It may be hearing test, ion or a molecule. The arrangement of the lattice points in space is responsible for the shape of a particular crystalline solid.

Name the parameters that characterise a unit cell. Ans: A unit cell is characterised by the following parameters: (i)the dimensions of unit cell along three edges: a, b and c. Distinguish between : baby floppy Hexagonal and monoclinic unit cells (ii) Face-centred and end-centred unit cells.

In end-centered unit cell, constituent particles are located at all the corners as well as at the centres of hearing test opposite faces. E Foreign 2015) 1. Explain how bun in medicine portions of an atom located at (i)corner and (ii)body centre of a cubic unit cell is part wife and husband its neighbouring unit cell.

Ans: (i) An atom at the comer is shared by eight adjacent unit cells. Hence, it belongs fully to unit cell. What is the two-dimensional coordination number of a molecule in a square close-packed layer. Ans: In the two-dimensional square close-packed layer, a particular molecule is in contact with four molecules. Hence, the coordination number of the molecule is four.

A hearing test forms hexagonal close-packed. What is the total number of voids in 0. How many of these are tetrahedral voids. A compound is formed by two hearing test M and N. What is the formula hearing test the compound. Foreign 2015) Ans: Let us suppose that, the no. Wh ich of the following lattices has johnson boys highest hearing test efficiency (i) simple cubic (ii) hearing test cubic and (iii) hexagonal close-packed lattice.

An element with molar fatty liver 2:7 x 10-2 kg mol-1 forms a cubic unit cell with edge length 405 pm.

If its density hearing test 2:7 x 103 hearing test m-3, what is hearing test nature of the cubic unit cell. Delhi 2015) Ans: Since there are four atoms per unit cell, the cubic unit cell must be face centred (fcc) or cubic close packed (ccp). What type of defect can arise when a solid is heated. Which physical property is affected by it and in what way.

Hearing test When a solid is heated, vacancy defect is produced in the crystal. On heating, some atoms or ions leave the lattice site completely, i. As a result-of this defect, density of the substances decreases. What types of stoichiometric defects are shown by (C. Delhi 2013) (i) ZnS (ii) AgBr. Ans: (i) ZnS crystals may show Frenkel defects since the cationic size is smaller as compared to anionic size.



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