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Standard XII

Chemistry

Voids

Ionic radii o...

Question

Ionic radii of $M g^{2 +}$ and $O^{2 -}$ ions are 66 pm and 140 pm respectively. The type of interstitial void and coordination number of $M g^{2 +}$ ion respectively are

tetrahedral, 12

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Octahedral, 6

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tetrahedral, 6

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octahedral, 8

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Solution

The correct option is B
Octahedral, 6

Radius ratio $= \frac{^{r} M g^{2 +}}{^{r} O^{2 -}} = \frac{66}{140} = 0.47$
Hence, $M g^{2 +}$ occupies octahedral void.

Coordination number of octahedral void is 6.

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Ionic radii of $M g^{2 +}$ and $O^{2 -}$ ions are 66 pm and 140 pm respectively. The type of interstitial void and coordination number of $M g^{2 +}$ ion respectively are

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Ionic radii of Mg2+ and O2− ions are 66 pm and 140 pm respectively. The type of interstitial void and coordination number of Mg2+ ion respectively are

The correct option is B Octahedral, 6 Radius ratio =rMg2+rO2−=66140=0.47 Hence, Mg2+ occupies octahedral void. Coordination number of octahedral void is 6.

Ionic radii of $M g^{2 +}$ and $O^{2 -}$ ions are 66 pm and 140 pm respectively. The type of interstitial void and coordination number of $M g^{2 +}$ ion respectively are

The correct option is B
Octahedral, 6

Radius ratio $= \frac{^{r} M g^{2 +}}{^{r} O^{2 -}} = \frac{66}{140} = 0.47$
Hence, $M g^{2 +}$ occupies octahedral void.

Coordination number of octahedral void is 6.