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Density

Metal hydride...

Question

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

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

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

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

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

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Solution

The correct option is D $L i H < N a H < K H < R b H < C s H$
According to Fajan's rule, polarising power decreases with increse in size of cation and hence covalent character decreases, Ionic character increases with decrease in covalent character. So, ionic character increases with increase in size of caption.

As we move down the group, the size of elements increases.

Thus, the order of atomic radii of the alkali metals is $L i < N a < k < R b < C s$ .

Thus, order of increasing percentage ionic character in alkali metal hydrides will be: $L i H < N a H < K H < R b H < C s H$

So, option (B) is correct.

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Similar questions

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

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

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

C s H

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