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Question

Which of the following are the correct axial distances and axial angles for rhombohedral system?

A
a=b=c,α=β=γ90
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B
a=bc,α=β=γ=90
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C
ab=c,α=β=γ=90
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D
abc,αβγ90
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Solution

The correct option is A a=b=c,α=β=γ90
The correct axial distances and axial angles for rhombohedral system are a=b=c,α=β=γ90.

All the three edge lengths are equal and all the three angles are equal but none of the angles is equal to 90o.

Examples of rhombohedral crystal include calcite, NaNO3 and CaCO3.

Hence, the correct option is A

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