Answer:
Option D
Explanation:
MX2→M2++2X−
van't Hoff factor for any salt can be calculated using equation
i=1+α(n−1)
where ,n= number of constituent ions
∴ i(MX_{2})=1+\alpha(3-1)
= 1+2\alpha
\frac{(\triangle T_{f})observed}{(\triangle T_{f})teoretical}=i=1+2\alpha
\therefore i=1+2 x0.5
i=2