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If \alpha is the degree of dissociation of Na_{2}SO_{4} the vant Hoff’s factor (i) used for calculating the molecular mass is

  • Option 1)

    1+\alpha

  • Option 2)

    1-\alpha

  • Option 3)

    1+2\alpha

  • Option 4)

    1-2\alpha

 
Answers (1)
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As we learnt in

Vant Hoff factor for dissociation -

i= 1+(n-1)\alpha

Where

n is the no. of dissociated particles

\alpha = degree of association
 

- wherein

NaC l \: \: \: n = 2

CaCl_{2} \: \: \: n = 3

K_{4}[F(CN_{6})]\: \: \: \: \: n=5

 

 

 

Na_{2}SO_{4}\rightleftharpoons 2Na^{+}+SO{_{4}}^{2-}

1-\alpha                 2\alpha               \alpha  

i=1-\alpha+2\alpha+\alpha

i=1+2\alpha

Correct option is 3.


Option 1)

1+\alpha

This is an incorrect option.

Option 2)

1-\alpha

This is an incorrect option.

Option 3)

1+2\alpha

This is the correct option.

Option 4)

1-2\alpha

This is an incorrect option.

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