Select the incorrect statement about hydrides
(A) Ionic hydrides, formed by most of the s block elements, are non-conducting in solid state.
(B) Molecular hydrides may act as a Lewis acid
(C) Molecular hydrides may act as a Lewis base
(D) Metallic hydrides are almost always non stoichiometric and they do not conduct heat and electricity.

Hint: The binary compounds that hydrogen creates with other elements on the periodic table are how the word "hydride" typically derives its origin. Ionic, metallic, and covalent hydrides are the three groups into which hydrides in s-block elements are divided based on their physical and chemical characteristics. These hydrides have a high ionic character because of hydrogen bonding.

Complete Step by Step Solution:
The general formula for hydrides in s-block elements $M{H_X}$ , where M is the elements of alkali and alkali earth elements and X is the number of hydrogen atoms. A negative charge ion known as a hydride.${H^ - }$ is called a hydride ion.

The most active metals and hydrogen combine to generate ionic hydrides. They are made specifically with group one and two elemental alkali and alkaline earth metals. S-block element ionic hydrides are binary compounds that are soluble in water. Ionic hydrides and water react quickly to form hydrogen gas.

When they are molten, they can conduct electricity. When in a solid state, they are non-conducting. Lewis acid or base can be produced via molecular hydrides. Most metallic hydrides conduct heat and electricity but are not stoichiometric. They only transfer heat and electricity when they are liquid or molten.
So, the correct answer is option A.

Note: Due to the hydride ion, ionic hydride is primarily used as a base or reducing agent in organic synthesis and does not dissolve in common solvents. Ionic hydrides electrolyzed in this way reveal the molecule contains hydrogen. These binary compounds that are insoluble in solutions are referred to as ionic hydrides, or saline hydrides.