1.

An ionic solid PQ crystallises in rocksaltstructure with density 4.0gm//cm^(3).If theradius of cation and anion is 83 and 167 pm respectively, then the molar mass of solid is[N_(A)=6xx10^(23)]

Answer»

75 gm/`CM^(3)`
`50gm//cm^(3)`
`25 gm//cm^(3)`
`150gm//cm^(3)`

Solution :`a=2[83+167]=500` pm
`DELTA=(ZxxM)/(N_(A)xxa^(3)xx10^(-30))=(4xxM)/(6.02xx10^(23)xx[500]^(3)xx10^(-30))=4`
M=75.25 gm / mole


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