Question

An ionic solid A+ B- crystalise like rock salt if all atoms along one body diagonal are removed then what is formula of substance​

Answer 1

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Answer 2

An ionic solid A⁺ B¯ crystallize like rock salt if all atoms along one body diagonal are removed.

then formula of substance will be ...

solution : structure of AB is like rock salt (NaCl)

it means A atoms present all corners and face centres of cubic lattice.

B atoms present edge centres and body centre of cubic lattice.

now all atoms along one body diagonal are removed.

atoms of four corners, two edge centres , two face centres and one body centre are removed.

so, A = (14 - 4 - 2) = 8

B = (13 - 2 - 1) = 10

A : B = 4 : 5

therefore formula of crystal will be A₄B₅ or A₁₂B₁₅ (it is mentioned in your options you I have added).