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(a) Saline hydride like
react with water to form a base & 
gas 
(b)
(c) Electron-Rich Hydride - it is a type of hydrides in which the number of
present are more than the number of 
required for making octet for ex-
Electron precise hydride -is the type of hydrides in which the number of
presents is equal to the no.of 
required (octet or duplet) 
(d)
are covalent or molecular hydrides .
Option 1)
(a),(b),(c) and (d).
Option 2)(c) and (d) only.
Option 3)(a),(c) and (d) only.
Option 4)(a),(b) and (c) only.