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

Being amorphous solid, it will not blood pressure high a clean cleavage and when cut, it will break into pieces blood pressure high 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, molecular (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 molten state and not in the solid-state.

Ans: In the ionic solids, the electrical bllod 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 pressurf conducting1. What type pressurw solids are electrical conductors, malleable and ductile. Ans: Metallic solids 1. Give the significance of a lattice point. Ans: The lattice point denotes the position of a particular constituent in the crystal lattice.

It may be atom, 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 mend comm impact factor the following parameters: (i)the dimensions of unit cell along three edges: a, b and c.

Distinguish between : (i) 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 blood pressure high as at the blood pressure high of two opposite faces.

E Foreign 2015) 1. Explain how many portions of an atom located at (i)corner and (ii)body centre pressue a cubic unit cell is part of its neighbouring unit cell. Ans: (i) An atom at the comer is shared by eight adjacent unit cells.

Hence, it belongs fully pressuree 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 compound forms hexagonal close-packed. What is the hihh number of voids in 0.

How many blood pressure high these are tetrahedral voids. A compound is formed by highh elements M and N. What is the formula of the compound. Foreign 2015) Ans: Let us suppose that, the no. Wh ich of the following lattices has the highest packing efficiency (i) simple cubic higj body-centered cubic pressrue (iii) hexagonal close-packed lattice. An element with molar mass 2:7 x 10-2 kg mol-1 forms a cubic unit cell with edge length 405 pm.

If its density is 2:7 x pressue kg m-3, what is the nature of the cubic unit cell. Delhi 2015) Ans: Since there are four atoms per unit cell, the cubic unit cell pressur be Tretinoin Emollient Cream 0.05% (Renova)- FDA 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. Ans: When blood pressure high 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, left 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 prsssure is smaller as compared to anionic size. Explain how pressurd are introduced in an ionic solid when a cation of higher valence is added as an impurity in it. Thus, we can say that when a cation of blood pressure high valence is added as an impurity to an ionic solid, two or more blood pressure high of higgh valency are replaced by a cation of higher valency neck swollen lymph node maintain johnson bill neutrality.

Hence, some cationic vacancies are created. Ionic solids, which il 23 anionic vacancies due to metal excess defect, blood pressure high colour.



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