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Standard XII

Chemistry

Coordination Number

Two ions A-...

Question

Two ions $A^{-}$ and $B^{-}$ have radii 104 and 200 pm respectively, in a cubic close-packed crystal of compound $A B$ . The co-ordinate number of $A^{+}$ is:

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Solution

The correct option is B 6
The radius ratio $= \frac{r^{+}}{r^{-}} = \frac{104}{200} = 0.52$
Hence, coordination number is 6. It is octahedral coordination.
The radius ratio range for the octahedral coordination is 0.414 to 0.732.

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Similar questions

Q. The two ions

A^{+}

and

B^{-}

have radii

88

pm and

200

pm respectively. In the closed packed crystal of compound

A B

, predict the co-ordination number of

A^{+}

Q. Two ions

A^{+}

and

B^{-}

have radii 88 and 200 pm respectively. In the closed packed crystal of compound predict the co-ordination number of

A^{+}

Two ions $A^{+}$ and $B^{-}$ have radii 88pm and 200pm, respectively. In the close-packed crystal of the compound AB, predict the coordination number of $A^{+}$

Q. In

A^{+} B^{-}

ionic compound, radii of

A^{+}

and

B^{-}

ions are

180 p m

and

187 p m

respectively. The crystal structure of this compound will be:

M g O

crystallizes in a cubic type crystal system. The ionic radii for

{M g}^{2 +}

and

O^{2 -}

are

0.066

0.140 n m

respectively. One can conclude that

{M g}^{2 +}

ions occupy :-
a) a cubic hole in a simple cubic structure.
b) every tetrahedral hole in a close packed structure.
c) an octahedral hole in a cubic close packed structure.
d) every other tetrahedral hole in a close packed structure.

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Two ions A− and B− have radii 104 and 200 pm respectively, in a cubic close-packed crystal of compound AB. The co-ordinate number of A+ is:

The correct option is B 6The radius ratio =r+r−=104200=0.52Hence, coordination number is 6. It is octahedral coordination. The radius ratio range for the octahedral coordination is 0.414 to 0.732.

Two ions $A^{-}$ and $B^{-}$ have radii 104 and 200 pm respectively, in a cubic close-packed crystal of compound $A B$ . The co-ordinate number of $A^{+}$ is:

The correct option is B 6
The radius ratio $= \frac{r^{+}}{r^{-}} = \frac{104}{200} = 0.52$
Hence, coordination number is 6. It is octahedral coordination.
The radius ratio range for the octahedral coordination is 0.414 to 0.732.