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The Solid State
Question
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Why is potassium chloride sometimes violet instead of pure white.

Answer

when a crystal of KCl is heated in an atomsphere of potassiuim vapour the Katoms lose electron to form K+ ions. The released electron diffuse into the crystal and occupy anionic site (F- centre)
These electron impart violet colour to the KCl crystal.

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Some More Questions From The Solid State Chapter

Give the significance of a 'lattice point'.

Name the parameters that characterize a unit cell.

Distinguish between Hexagonal and monoclinic unit cells.

Distinguish between Face-centred and end-centred unit cells.

What is the two-dimensional coordination number of a molecule in square close packed layer ?

A compound is formed by two elements M and N. The element N forms ccp and atoms of M occupy 1/3 of tetrahedral voids. What is the formula of the compound?

Which of the following lattices has the highest packing efficiency: