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How many of the following compounds are classified as saline (ionic) hydrides? NaH, MgH2, CaH2, VH0.56, Fe3H, NH3

1. 1
2. 2
3. 3
4. 4

Correct answer: 3

Solution

NaH (alkali metal, saline), MgH2 (alkaline earth, saline), and CaH2 (alkaline earth, saline) are all ionic/saline hydrides. VH0.56 and Fe3H are interstitial (metallic) hydrides. NH3 is a covalent hydride. Hence 3 of the listed compounds are saline hydrides.

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