Arrange the following $L i H, N a H$ and $C s H$ in order of increasing ionic character.

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Solution

The ionic character of bond depends on electronegativity difference between two atoms. When the electronegativity difference is larger, the ionic character is smaller. On moving down the group of alkali metals, the electronegativity decreases from Li to Cs. Hence the ionic character increases in the order $L i H < N a H < C s H$ .

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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

C a H_{2}

B e H_{2}

T i H_{2}

L i H, N a H

C s H

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H_{2} O

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

C s H

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