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  • Give answer! An ionic compound AB form NaCl structure where B- arrange in CCP manner and A+ occupy all octahedral voids . If atoms along a body diagonal are removed then the formula of compound is

An ionic compound AB form NaCl structure where B- arrange in CCP manner and A+ occupy all octahedral voids . If atoms along a body diagonal are removed then the formula of compound is

  • Option 1)

    A5B4

  • Option 2)

    AB

  • Option 3)

    A4B5

  • Option 4)

    A3B4

 

Answers (1)

best_answer

Body diagonal contains two corners and an octahedral voids.

Number\; of\; A^{+}\; ion=6\times \frac{1}{2}+6\times \frac{1}{8}=\frac{15}{4}

Number\; of\; B^{-}\; ion=12\times \frac{1}{4}=3

A_{\frac{15}{4}}B_{3}\; \; \; or\; \; \; \; A_{5}B_{4}

 

 

Location of octahedral void -

octahedral void found at each edge centre and at body centre

- wherein

In FCC unit cell total number of octahedral voids = 4

 

 


Option 1)

A5B4

This is correct

Option 2)

AB

This is incorrect

Option 3)

A4B5

This is incorrect

Option 4)

A3B4

This is incorrect

Posted by

Aadil

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