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The density of Ionic solid B^(+)A^(-) (C...

The density of Ionic solid `B^(+)A^(-)` (Crystallises in rock salt type) is 4g/cc and the value of face diagonal unit cell is `600sqrt2` pm. If 1.296 g of an ionic solid `B^(+)A^(-)` (Salt of W.B. `+` S.A.) dissolved in water to make one litre solution, then its pH is `("T = 298K, "K_(b)" for BOH is "10^(-4). N_(A) = 6 xx 10^(23))` 

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The correct Answer is:
6
The value of face diagonal is `sqrt2a=600sqrt2p m, a=600 p m`
`d=(Zm)/(a^(3)N)rArr M=(4xx6xx10^(23)xx(6xx10^(-8))^(3))/(4)=129.6gm`
`"129.6 gm "rarr"1 molar , 1.296 gm "rarr?10^(-2)" molar"`
The salt is formed from weak base 2 strong acid
`PH=7-(1)/(2)Pkb-(1)/(2)log C=7-2+1=6`
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