MCQ
Van't Hoff factor of $Ca{(N{O_3})_2}$ is
- A$1$
- B$2$
- ✓$3$
- D$4$
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$I :$ The three elements are metals.
$II :$ The electro negativities decrease from $X$ to $Y$ to $Z$.
$III :$ The atomic radius decreases in the order $X, Y$ and $Z.$
$IV : X, Y$ and $Z$ could be phosphorus, aluminium and sodium respectively.