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NEET levelSingle correct optionDifficulty 1 of 3sb061

Which of the following hydrogencarbonates is not known in the solid state?

A $NaHCO X_{3}$
B $RbHCO X_{3}$
C $KHCO X_{3}$
D $LiHCO X_{3}$

Answer: D

The small, highly polarising Li+ ion cannot stabilise the large

HCO X_{3} X^{-}

anion in a crystal, so

LiHCO X_{3}

exists only in solution. The other alkali metal hydrogencarbonates are isolable solids.

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