$N a H$ is an example of:

Electron-rich hydride

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Molecular hydride

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Saline hydride

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Metallic hydride

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Solution

The correct option is C Saline hydride
Saline hydrides are also called ionic hydride. Metals having electronegativity lower than hydrogen form such hydride. All elements of group 1 and group 2 when heated form ionic hydride. Metallic hydrides are also called interstitial hydride.
sodium being group 1 element forms a saline hydride.
$2 N a + H_{2} \to 2 N a H$

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Question 3

Metal hydrides are ionic, covalent or molecular in nature. Among LiH,NaH, KH,RbH,CsH, the correct order of increasing ionic charcter is

(a) LiH > NaH > CsH > KH > RbH

(b) LiH < NaH < KH < RbH < CsH

(d) NaH > CsH > RbH > LiH > KH

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