Question

As per observation (iii) LiH is more stable than NaH, because :

• A. Due to small size of ${Li}^{+}$, the lattice energy of LiH is greater
• B. Due to greater size of $H^{-}$, the lattice energy of LiH is greater
• C. LiH is more covalent than NaH
• D. Due to greater size of ${Na}^{+}$, the lattice energy of NaH is greater.

Answer 1

The correct option is A Due to small size of ${Li}^{+}$, the lattice energy of LiH is greater

As per observation (iii), LiH is more stable than NaH, because, Due to small size of ${Li}^{+}$, the lattice energy of LiH is greater

As the size of the ion is small it has more force of attraction and, so it requires a lot of energy break down the bond, so it is stable.

Hence, the correct option is $\text{A}$