Chemist Interview Question:

Which one is polar HCl or HF?

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This question is quite simple if you have an electro negativity chart:

Florine's Electronegativity: 4.0

Chlorine's Electronegativity: 3.0

Hydrogen's Electronegativity: 2.1

HCl: 3.0-2.1= .9 (Slightly polar)

HF: 4.0-2.1= 1.9 (Much more polar)
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