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Standard XII

Chemistry

Examples of Ionic Compounds

In antifluori...

Question

In antifluorite structure, the negative ions:

occupy tetrahedral voids

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occupy octahedral voids

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are arranged in ccp

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are arranged in hcp

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Solution

The correct option is C are arranged in ccp
In the antifluorite structure, the negative ions are arranged in ccp.
The positive ions occupy all tetrahedral voids.
$N a_{2} O$ and $L i_{2} O$ have antifluorite structure as shown in the figure.

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Similar questions

Q. In a closed packed structure of mixed oxides, the oxide ions are arranged in hcp array. One eight of tetrahedral voids are occupied by divalent cations (A) while one-half of octahedral voids are occupied by trivalent cations (B). What is the formula of the compound?

Q. A compound with formula

A B_{2} O_{4}

adopts a crystal structure in which

O^{2 -}

ions forms ccp arrangement.

A^{2 +}

ions occupy octahedral voids while

B^{3 +}

ions are distributed equally between tetrahedral and octahedral voids. The fraction of octahedral and tetrahedral voids occupied respectively are:

O^{2 -}

ions are arranged in ccp in a spinel structure.

A^{2 +}

ions occupy one-eighth of tetrahedral voids and

B^{+}

ions occupy half of octahedral voids. The void volume of unit cell is

0.11

. Find the value of positive ions

A

in unit cell.

In a normal spinel type structure, the oxide ions are arranged in ccp whereas $\frac{1}{8}$ tetrahedral holes are occupied by $Z n^{2 +}$ ions and 50% of octahedral holes are occupied by $F e^{3 +}$ ions. The formula of the compound is ?

Q. In a compound

X Y_{2} O_{4}

oxide ions are arranged in ccp structure. Cation X are present in octahedral voids and cation Y are equally distributed between octahedral and tetrahedral voids. The fraction of the octahedral voids occupied is:

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In antifluorite structure, the negative ions:

The correct option is C are arranged in ccpIn the antifluorite structure, the negative ions are arranged in ccp.The positive ions occupy all tetrahedral voids. Na2O and Li2O have antifluorite structure as shown in the figure.

The correct option is C are arranged in ccp
In the antifluorite structure, the negative ions are arranged in ccp.
The positive ions occupy all tetrahedral voids.
$N a_{2} O$ and $L i_{2} O$ have antifluorite structure as shown in the figure.