Question

Which of the following has minimum melting point?

• A. CsF
• B. HCl
• C. HF
• D. LiF

Answer 1

Answer: (B)

Ionic compounds have high melting point. Greater the ionic character, more is melting point. $HCl$ has least ionic character because of maximum electronegativity difference between the two constituent elements, ( $H$ and $Cl$) among $CsF,HCl,HF$ and $LiF$
$\therefore HCl$ has minimum melting point.