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The Solid State
Question
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Why does zinc oxide exhibit enhanced electrical conductivity on heating?

Answer

Zinc oxide is white in colour at room temperature. On heating it loses oxygen and turns yellow.On heating, zinc oxide loses oxygen


The excess zinc ions are accomodated in interstitial sites with electrons trapped in the neighbourhood. The enhanced conductivity is due to these trapped electrons.

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Some More Questions From The Solid State Chapter

Ionic solids conduct electricity in liquid state but not in solid state. Explain.

What type of solids are electrical conductors, malleable and ductile?

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?