1.

A compound formed by elements X and Y crystallises in a cubic structure in which atom X are at corners of the cube and Y are at face centre. The formula of compound is

Answer»

`X_2Y` 
`XY `
`XY_2` 
`XY_3`

SOLUTION :Number of X-atom = `(8 XX 1/8) = 1`
Number of Y-atoms = `(6 xx 1/2) = 3`
`THEREFORE X : Y = 1 : 3 IMPLIES XY_3`


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