Unit4 The solid state qns

Unit4 The solid state qns - 1 UNIT 4 STATES OF MATTER THE...

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1 QUEST TUTORIALS Head Office : E-16/289, Sector-8, Rohini, New Delhi, Ph. 65395439 UNIT 4 STATES OF MATTER THE SOLID STATE 1. If a substance is cleaved or crushed in to a powder, each resulting particle possesses identical interfacial angles. It is characteristic of (a) crystalline solids (b) amorphous solids (c) para crystalline solids (d) none of these 2. Crystal angles or interfacial angles (a) are measured with goniometer (b) remain constant for a given crystals (c) are the basics of Steno;s Law of First Law of Crystallography (d) all of these 3. On the basis of axial lengths and crystal angles, we have seven crystal systems. Which parameters given below points to hexagonal crystal system ? (a) a = b, c ; α = β = γ = 90º (b) a, b, c ; α = β = γ = 90º (c) a = b = c ; α = β = γ 90º (d) a =b =c ; α = β =90º, γ = 120º 4. How many Bravais can exist in nature (a) 7 (b) 14 (c) 17 (d) 32 5. The Miller indices are often used in the area of (a) single crystal (b) surface chemistry (c) polymer (d) Molecular spectrum 6. A crystal plane intercepts the three crystallographic axes at the multiples of the unit distances 3/2, 2 and 1. The miller indices are (a) 123 (b) 321 (c) 436 (d) 643 7. A certain metal crystallises in a simple cubic structure. At a certain temperature it arranges to gave a body-centred structure. In this transition, the density of the metal (a) decreases (b) increases (c) remain unchanged (d) changes without a definite pattern 8. KBr has face – centred cubic lattice and the edge of the unit cell is 6.54 Aº. The density of the crystal in g/c.c. is (a) 1.405 (b) 2.81 (c) 2.17 (d) 5.62 9. The unit cell of Al is a cube with an edge length of 405 pm. The density of Al is 2.70 Cm –3 . The type of unit cell of Al is (a) simple cubic (b) body – centred cubic (c) face-centred cubic (d) none of these 10. How many atoms are there in a unit cell of Mg which forms hexagonal crystals there being a face-centred atom in each end of the unit cell and 3 completely enclosed atoms within the unit cell? (a) 4 (b) 6 (c) 12 (d) 8 11. The unit cell of Al is a cube with an edge length of 4.05 Aº. Calculate the numberof unit cells in an Al sheet of 20 cm × 10 cm x 0.64 cm (a) 4 × 10 22 (b) 8 × 10 22 (c) 12 × 10 22 (d) 12 × 10 23 12. AB AB ……. Close-packing of identical spheres given rise to (a) a face-centred cubic structure (b) a body-centred cubic structure (c) a hexagonal close-packed structure (d) a cubic close-packed structure 13. Which geometrical arrangement of atoms about a central atom is predicted by a C. N. of 4 ? (a) primitive cubic (b) plane triangular (c) octohedral (d) tetragonal 14. The CsCl unit cell is best described as (a) primitive cubic (b) body-centred cubic (c) face-centred cubic (d) ortho-rhombic
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2 QUEST TUTORIALS Head Office : E-16/289, Sector-8, Rohini, New Delhi, Ph. 65395439 15. The mnost malleable metals (Cu, Ag, Au) have close-packing of the types ? (a) Hexagonal close-packing
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This note was uploaded on 10/05/2011 for the course CHEM 1201 taught by Professor Darcy during the Spring '11 term at St. Mary NE.

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Unit4 The solid state qns - 1 UNIT 4 STATES OF MATTER THE...

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