1.

An ionic solid PQ crystallises in rock salt structure with density 4.0 gm//cm^(3) . If the radius of cation and anion is 83 and 167 pm respectively, then the molar mass of solid is [N_(A) = 6 xx 10^(23)]

Answer»

`75 gm//mol`
`50 gm//mol`
`25 gm//mol`
`150 gm//mol`

SOLUTION :`a = 2[83+167]=500 "pm"`
`d = (Z xx M)/(N_(A)XXA^(3)xx10^(-30))`
`=(4xxM)/(6XX10^(23)xx[500]^(3)xx10^(-30))=4`.
`M = 75 gm//"MOLE"`.


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