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JAMB Chemistry 1999 Question 16

Question 16

Chemical Bonding

Given that electronegativity increases across a period and decreases down a group in the periodic table, in which of the following compounds will the molecules be held together by the strongest hydrogen bond?

  1. A.HF(g)
  2. B.NH3(g)
  3. C.CH4(g)
  4. D.HCl(g)
Show the answer and explanation

Answer: A (HF(g))

Explanation

Hydrogen bonds are strongest when H is joined to the most electronegative atom. Fluorine is the most electronegative element, so HF forms the strongest hydrogen bonds.