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JEE Main levelSingle correct optionDifficulty 2 of 3sb134

Which bicarbonate is not known in the solid state?

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

Answer: B

LiHCO X_{3}

exists only in solution, because the strongly polarising

Li X^{+}

disfavours the hydrogencarbonate ion in the crystal. Na, K and Rb form solid hydrogencarbonates.

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