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Oxides and Oxoanions

Which of the ...

Question

Which of the following formulas is consistent with the unit cell of the rhenium oxide compound shown below ?

A

$R e_{2} O_{6}$

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B

$R e_{2} O_{3}$

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C

$R e O_{6}$

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D

$R e O$

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Solution

The correct option is A
$R e_{2} O_{6}$

Effective number of Rhenium= $\frac{1}{8} \times 8 = 1$
Effective number of oxygen= $12 \times \frac{1}{4} = 3$
$∴$ formula= $R e O_{3} o r R e_{2} O_{6}$

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