The bicarbonate of alkali metal which does not exist in solid state is:

L i H C O_{3}

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N a H C O_{3}

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K H C O_{3}

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R b H C O_{3}

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Solution

The correct option is A $L i H C O_{3}$
Li differs from the rest of the family members and shows anomalous behaviour. Lithium bicarbonate found in solution form while other bicarbonates of alkali metals exist in solid-state. Its anomalous behaviour is due to the following reasons:-
1.Its exceptionally small size
2.High polarizing power.
So $L i H C O_{3}$ does not exist in solid-state.

Hence option A is correct.

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L i H {C O}_{3}

{C a (H C O}_{3})_{2}

{Z n (H C O}_{3})_{2}

{N a H C O}_{3}

{A g H C O}_{3}

L i H C O_{3}

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Z n {(H C O_{3})}_{2}

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N H_{4} H C O_{3}

C s_{2} O < R b_{2} O < K_{2} O < N a_{2} O < L i_{2} O

N a_{2} O_{2} < K_{2} O_{2} < R b_{2} O_{2} < C s_{2} O_{2}

L i H C O_{3} < N a H C O_{3} < K H C O_{3} < R b H C O_{3} < C s H C O_{3}

N a F < N a C l < N a B r < N a l

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