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in The Solid State by (28.9k points)
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(a) Which of the following is a molecular solid?
(a) Diamond
(b) Graphite
(c) Ice
(d) Quartz

(b) Unit cells can be classified into primitive and centered unit cells. Differentiate between primitive and centered unit cells.

(c) Presence of excess Sodium makes NaCI crystal coloured. Explain on the basis of crystal defects.

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(a) Ice

(b) In primitive unit cell constituent particles are present only at the corner positions. Unit cells in which one constituent particles are present at the centres of a faces in addition to those at corners.

(c) Such anionic sites occupied by unpaired electrons are called F – centres (colour centres). They impart yellow colourto the crystals of NaCI. The colour results by excitation of these electrons when they absorb energy from the visible light falling on the crystals.

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