If α is the degree of dissociation of Na2SO4, the vant Hoff's factor

Question

α

is the degree of dissociation of

N a_{2} S O_{4}

, the vant Hoff's factor (i) used for calculating the molecular mass is

Options:

A . 1+α

B . α

C . 1+2α

D . 1−2α

Answer: Option C
:
C

N a_{2} S O_{4}      1 - α ⇌ 2 N a^{+}      2 α + S O_{4}^{2 -}      α

Totalno. ofionsafter dissociation =

1 + 2 α

vant Hoff's factor,

i = \frac{N o . o f p a r t i c l e s a f t e r d i s s o c i a t i o n}{N o . o f p a r t i c l e s b e f o r e d i s s o c i a t i o n} = 1 + 2 α

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