Question

The incorrect statement in the following is:

• A. Ionic hydrides are crystalline in nature
• B. Group 14 elements form electron precise hydrides
• C. Covalent hydrides are non-volatile compounds
• D. Generally, saline hydrides react violently with water

Hint:

Remember: Covalent hydrides are often volatile due to weak intermolecular forces, while ionic hydrides are crystalline solids and highly reactive with water.

Answer 1

The Correct Option is C

Step 1: Understanding hydride classifications.
Hydrides are broadly categorized into:
Ionic (saline) hydrides — formed with s-block metals; they are crystalline and react violently with water.
Covalent hydrides — formed with p-block elements, and they are generally volatile due to their molecular nature.
Metallic hydrides — formed with d- and f-block elements.
Step 2: Evaluating the options.
(1) True — Ionic hydrides like NaH, CaH₂ are crystalline.
(2) True — Group 14 elements form electron-precise hydrides like CH₄, SiH₄.
(3) False — Covalent hydrides (e.g., CH₄, NH₃, H₂O) are typically volatile.
(4) True — Saline hydrides react with water to produce hydrogen gas explosively.
Thus, the incorrect statement is (3).