Question

1. Read the passage given below and answer the following questions:
la solids of square clase packing, the atoms have horizontal and vertical alignment, ie, the spheres in the adjacent rows lie
just one over the other as in the arrangement given below
In solids of hexagonal closed packing, the atoms are so arranged that atoms in every second row occupy the depressions
between the spheres of first row
The following questions are multiple choice questions. Choose the most appropriate answer :
0 The coordination number of a metal crystallising in a square closed packed structure is:
(b) 2
(d) &
(i) The coordination number in hcp arrangement of a crystalline solid is:
(a) 2
(b) 4
(d) 6
(c) 8
13
14
OR
Which of the following describes the hexagonal close-pack arrangement of spheres?
(a) AB CABA
(b) AB CA BC
(c) AB AB AB
(d) AB BA BB
fub Hexagonal close-packing (hep) is more eflicient because
(16) it contains large number of constituent particles (b) it contains six layers
(it has more empty space in the crystal lattice
(O) is closely packed and has very less empty space in packing
liv)Select the metal which shows hexagonal closc packing (hep).
(6) Molybdenum
(b) Copper
(c) Silver
(d) Nickel

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Answer 1

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