Question

The most dangerous method of preparing hydrogen would be by the action of $HCl$ and.

• A. $Al$
• B. $K$
• C. $Fe$
• D. $Zn$

Answer 1

Answer: (B)

$K$

Answer 2

Although lattice energy of $LiCl$ higher than $NaCl$ but $LiCl$ is covalent in nature and $NaCl$ ionic there after, the melting point decreases as we move $NaCl$ because the lattice energy decreases as a size of alkali metal atom increases (lattice energy $\propto$ melting point of alkali metal halide).