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Given that electronegativity increases across a... - JAMB Chemistry 1999 Question

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?
A
HF(g)
B
NH3(g)
C
CH4(g)
D
HCl(g)
correct option: a
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