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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=γ≠90∘The correct axial distances and axial angles for rhombohedral system are a=b=c,α=β=γ≠90∘.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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