Which of the following bicarbonates does not exist as solid?
(a) KHCO₃ (b) NaHCO₃
(c) CsHCO₃ (d) LiHCO₃
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Answer:
d)LiHCO3
LiHCO3 does not exist in solid state due to the high hydration enthalpy of Li+ ion and its diagonal relation with Mg from alkaline earth metal group where none of the metals bicarbonate exists in solid state.
Group 2 elements having more polarising power form covalent bonds, they tend to exist in aqueous solution only rather than solid.Thus Ca(HCO3)2 exist in aqueous solution only.
Further Zn(HCO3)2 and AgHCO3 are soluble always and they exist as solutions always rather than alkali metal and ammonium salts of bicarbonate exist as solids.
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he anwer is option c..........
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