Thermal stability of hydrides of first group elements follows the order :

LiH > NaH > KH > RbH

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LiH > KH > NaH > RbH

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LiH > RbH > KH > NaH

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LiH > KH > RbH > NaH

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Solution

The correct option is A LiH > NaH > KH > RbH
As we move from top to bottom in a group the size of the alkali metals increases, thereby the bond dissociation energy decreases hence it requires less energy to decompose so thermal stability also decreases..
So the order of thermal stability of IA group elements is $L i H > N a H > K H > R b H$ .
Hence option A is correct.

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Similar questions

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

L i H, N a H, K H, R b H

C s H

Match the following

A) Thermal stability order of hydrides 1) Na > K >Rb> Li > Cs

B) Ionic nature of hydrides 2) Li > Na > K >Rb> Cs

C) I.P₂ values order 3) CsH>RbH> KH >NaH>LiH

D) Abundance decreasing order 4) LiH>NaH> KH >RbH>CsH

N a H {C O}_{3}

K H {C O}_{3}

(K_{h})

25^{\circ} C ?

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