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The observed osmotic pressure for a 0.10 M solution of

Question:

The observed osmotic pressure for a $0.10 \mathrm{M}$ solution of $\mathrm{Fe}\left(\mathrm{NH}_{4}\right)_{2}\left(\mathrm{SO}_{4}\right)_{2}$ at $25^{\circ} \mathrm{C}$ is $10.8$ atm. The expected and experimental (observed) values of Van't Hoff factor (i) will be respectively $:\left(\mathrm{R}=0.082 \mathrm{~L}\right.$ atm $\left.\mathrm{k}^{-} \mathrm{mol}^{-1}\right)$

1. 3 and 5.42

2.  5 and 3.42

3.  4 and 4.00

4.  5 and 4.42

Correct Option: , 4

Solution: