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If solid A^(+)B^(-) having ZnS Structure...

If solid `A^(+)B^(-)` having `ZnS` Structure is heated so that the ions along two of the axis passing through the face center particles are lost and bivalent ion (Z) enters here to maintain the electrical neutrality,so that new formula unit becomes `A_(x)B_(y)Z_(c)` Report the value of `x+y+c` 

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The correct Answer is:
7
For `ZnS-(Z_(CH)//ZnS)=4` no. of `B^(-)="4/unit cell (corner + face centre)"`
No. of `A^(+)=4//" unit cell (in alternate T.V)"`
`"No. of "Br^(-)" ion removed"=4 "(two from each face centre)"xx(1)/(2)"(per face centre share)"=2`
`"No. of "Br^(-)" ions left "=4-2=2.."unit cell"`
`"No. of "Z^(-2)" ions entering in place of "B^(-)=1`
`"[To maintain electrical neutrality, "2B^(-)=1Z^(-2)]`
Formula `=A_(4)B_(2)Z_(1) therefore x+y+c=4+2+1=7`
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