The alkali metals form salt-like hydrides by the direct synthesis at elevated temperature. The thermal stability of these hydrides decreases in which of the following orders?

KH > NaH > LiH > CsH > RbH

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NaH > LiH > KH > RbH > CsH

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LiH > NaH > KH > RbH > CsH

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CsH > RbH > KH > NaH > LiH

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Solution

The correct option is C
LiH > NaH > KH > RbH > CsH

The thermal stability of the hydrides decreases from LiH to CsH due to increase in the size of cation.

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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

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

L i H, N a H

C s H

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