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What are two types of crystal structures...

What are two types of crystal structures shown by ice at different pressures ?

A

Hexagonal and monoclinic

B

Cubic and monoclinic

C

Hexagonal and tetragonal

D

Cubic and hexagonal

Text Solution

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The correct Answer is:
D
Ice can assume a larger number of different crystallite structures, more than any other known material. At ordinary pressure the stable phase of ice is called ice I. 'There are two closely related varients of ice I : hexagonal ice I, which has hexagonal symmetry and cubic ice I, which has a crystal structure similar to diamond.
Ice I is the normal form of ice, iceI, is formed by depositing vapour at every low temperatures (below 140 K).
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