Identify the bond between H and F in HF molecule.

Explanation

The nature of bond in HF molecule is ionic
Electronegativity
Along the period, from left to right in the periodic table the electronegativity increases because of the increase in the nuclear charge which in turn attracts the electrons more strongly. On moving down a group, the electronegativity of the elements decreases because of the increased number of energy level.
Dilute or concentrated nitric acid `(HNO_(3))` renders aluminium passive. Because nitric acid does not attack aluminium but it renders aluminium passive due to the formation of an oxide film on its surface.