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Binary Compounds - Hydrides

Metal hydride...

Question

Metal hydrides are ionic, covalent or molecular in nature. Among $L i H, N a H, K H, R b H$ and $C s H$ , the correct order of increasing ionic character is:

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

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

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

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

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Solution

The correct option is B $L i H < N a H < K H < R b H < C s H$
Ionic character increases with the size of the cation as we move down the group. As the ionisation enthalpy decreases on moving from top to bottom in a group, the tendency to lose electron by metal increases. Hence ionic character increases.

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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

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.

C a H_{2}

B e H_{2}

T i H_{2}

L i H, N a H

C s H

H - H, D - D

F - F

N a H, M g H_{2}

H_{2} O

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