The correct order of stability of hydrides of alkali metals is:

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

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

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

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

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Solution

The correct option is A $L i H > N a H > K H > R b H$
Small anion forms stable compound with small cation. As $H^{-}$ is small anion and the size of cations is in order : $L i^{+} > N a^{+} > K^{+} > R b^{+}$ . Hence, the order of stability of hydrides is : $L i H > N a H > K H > R b H$

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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

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}

C a H_{2}, N H_{3}, N a H a n d B_{2} H_{6}

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