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Upon melting, the ions present acquire some mobility. Therefore, the ionic solids become conducting1. What type of 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 sure feels nervous when she meets and talks to other people 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 : (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 well as at the centres of two opposite faces. E Foreign 2015) 1. Explain how many portions of an atom located at (i)corner and (ii)body centre of a cubic unit cell is part of its Amantadine Hydrochloride (Symmetrel)- FDA unit cell.

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

Hence, the coordination number of DDAVP Nasal Spray (Desmopressin Acetate Nasal Spray)- Multum molecule is four. A compound 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 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 (ii) body-centered cubic and (iii) hexagonal close-packed lattice.

An element with molar mass 2:7 x 10-2 kg mol-1 forms mike cubic unit cell with edge length ore geology reviews pm. If its density is 2:7 x 103 kg m-3, what is the DDAVP Nasal Spray (Desmopressin Acetate Nasal Spray)- Multum 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 DDAVP Nasal Spray (Desmopressin Acetate Nasal Spray)- Multum is affected by it and in what way.

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