Question

As per observation LiH is more stable than NaH because:
A.Due to small size of $L{i^ + }$ , 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 $N{a^ + }$ , the lattice energy of NaH is greater

Answer 1

Hint: Lithium is the chemical element that occurs first in the alkalis of the periodic table. Moreover, lithium hydride is an alkali metal halide which is a colorless solid with a high melting point. This compound is not soluble but reactive with all organic and protic solvents. To solve this question, we need to know the properties of lithium.

Complete step by step answer:
Basically, lithium hydride is an inorganic compound with chemical formula LiH. It is soluble and non-reactive with certain molten salts such as lithium fluoride, lithium borohydride and sodium hydride whereas NaH i.e. sodium hydride is an alkali metal hydride which is used as a strong yet combustible base in organic synthesis.
Now, as per the observation, LiH is more stable than NaH. Due to the small size of $L{i^ + }$ , the lattice energy of LiH is greater. As the size of the ion is small it has more force of attraction and hence it requires a lot of energy to break the bond and therefore it is more stable. Now, let’s discuss some of the properties of lithium.
A.It has a very low density and viscosity
B.Metallic lithium reacts extremely vigorously with water
C.It reacts with oxygen to form monoxide and peroxide

Hence, option A is correct.

Note: Lithium is found only in salts and minerals. Moreover, the lithium-ion battery is a key component that is used in many digital devices. It is the lightest solid metal and is present in the Earth’s crust in 665 ppm (parts per million).