MCQ
The $H-$ bonds in solid $HF$ can be best represented as
- A$H-F-H-F-H-F$
- B

- ✓

- D





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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.