1.

If alpha is the degrcc of dissociation of Na_(2) SO_(4) the Vant Hoff s factor (i) uscd for calculating the molecular mass is

Answer»

`1+ alpha `
`1- alpha`
`1+ 2 alpha`
`1- 2 alpha `

Solution :`Na_(2) SO_(4) to 2NA^(4)+ SO_(4)^(2-)`
`{:(" Mol. Beforre dissociation",1,0,0),("Mol after dissociation",1-alpha, 2 alpha, 1 alpha ):}`
`i =1- alpha+ 2 alpha + alpha =1+ 2 alpha `


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