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Question

Which of the following is a crystalline solid ?

A
Graphite
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B
Calcite
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C
Gallium
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D
Oxygen
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Solution

The correct options are
A Graphite
B Calcite
Crystalline solid is a solid material whose constituents, such as atoms, molecules or ions are arranged in a highly ordered microscopic structure, forming a crystal lattice that extends in all directions.
Calcite has its all molecules arranged in regular fashion. Structure of this solid is shown in the figure.

Graphite is a crystalline form of the element, carbon with its atoms arranged in a hexagonal structure. It occurs naturally in this form and is the most stable form of carbon under standard conditions.

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