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

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

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

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

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K H < N a H < L i H > C s H > R b H

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Solution

The correct option is D $L i H > N a H > K H > R b H > C s H$
$1.$ $L i H < N a H < K H < R b H < C s H$
$2.$ Small anion forms stable compounds with small cations.
Thermal stability decreses, when size of cation increases as $B$
$L i H < N a H < K H < R b H < C s H$
$3.$ Because size of the anion increases as
$L i + < N a + < K + < R b + < C s .$

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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

Arrange the following.
$C a H_{2}, B e H_{2}$ and $T i H_{2}$ in order of increasing electrical conductance.

LiH, NaH and CsH in order of increasing ionic character.

H - H, D - D and F - F in order in order of increasing bond dissociation enthalpy.

$N a H, m g H_{2}$ and $H_{2} O$ in order of increasing reducing property.

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