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The Van't Hoff factor of a 0.1 M Al(2)(S...

The Van't Hoff factor of a `0.1 M Al_(2)(SO_(4))_(3)` solution is `4.20`. The degree of dissociation is

A

`80%`

B

`90%`

C

`78%`

D

`83%`

Text Solution

Verified by Experts

The correct Answer is:
A
`Al_2(SO_(4))_(3) hArr 2Al^(3+) + 3SO_(4)^(2-)`
`{:(1, 0,0),(1-alpha, 2alpha, 3alpha):}`
`i=1-alpha+2alpha+3alpha=1+4alpha=4.2 rArr alpha=0.8`
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