Identify which of them are polar and non-polar
(a) `HF` (b) `BeCI_(2)` (c ) `HgCI_(2)` (d) `NH_(3)`
(e) `H_(2)O` (f) `N_(2)` (g) `AICI_(3)` (h) `C CI_(4)`
(i) `CI_(2)` (j) `SiCI_(4)` .

Explanation

To determine whether the given molecules are polar or non-polar, we need to analyze the molecular geometry and the electronegativity differences between the atoms in each molecule. Here’s the step-by-step solution:

### Step 1: Analyze HF
- **Electronegativity Difference**: Fluorine (F) is more electronegative than hydrogen (H).
- **Molecular Geometry**: HF is a diatomic molecule with a linear structure.
- **Dipole Moment**: The dipole moment is directed towards fluorine.
- **Conclusion**: Since the dipole moment is not equal to zero, HF is **polar**.

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