1.

A solid is formed by two elements P and Q. The element Q forms cubic close packing and atoms of P occupy two-third of tetrahedral voids. The formula of the compound is

Answer»

`PQ_(3)`
`P_(3) Q`
`P_(2)Q_(3)`
`P_(3)Q_(2)`

Solution :Let the no. of Q atoms = n
No. of tetrahedral VOIDS = 2N
No. of P atoms `=2n XX ( 1)/( 3)= ( 2n )/( 3)`
FORMULA `: P : Q `
`( 2n )/( 3) : n ` or `2:3 ` `:. P _(2) Q_(3)`


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