Distinguish clearly between salt-like and covalent hydrides.
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Solution
Salt-like hydrides are also called ionic hydrides. They are formed by group 1 and 2 elements with H2. They are basic in nature. They dissolve in water forming alkali and give H2 gas, .e.g., NaH,CaH2,KH, etc.
Covalent hydrides are formed between less electropositive or electronegative elements. Ex:B2H6,AlH3,BeH2, They are insoluble in water.