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 Why LiHCO3 does not exist in form of solid ??

Dear Student,

@vaibhav !Good to see that you tried to answer. But, I would like say that the correct answer to this question is..

LiHCO3 is found in solution form while rest alkali metals hydrogen carbonates are solid due to the anomalous properties of Li and it's diagonal relationship with the Mg.

Following are the points of difference between Li and other alkali metals.

(i) it's exceptionally small size.

(ii)it's high polarizing power(charge/radius ratio).

@WannaChat! Hope this answers your query.

Good Luck!

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View Full Answer

  • The Li atom and ion are exceptionally small in size.

  • Li has high polarizing power. [charge to radius ratio (charge/ radius)]

  • Lithium compounds are soluble in organic solvents due to covalent character of lithium compounds because of the above reasons.

  • Points of difference between lithium and alkali metals

  • Li is harder and has high melting and boiling points.

  • Strongest reducing agent, forms Li2O and Li3N by reacting with air

  • LiCl is deliquescent and crystallises as a hydrate, LiCl. 2H2O.

  • LiHCO3 does not exist as solid.

  • Does not form ethynide with ethyne

  • On heating, lithium nitrate decomposes to oxide while nitrates of other alkali metals decompose to nitrites.

  • Fluoride and oxide are less soluble in water.

  • Li shows diagonal relationship to Mg.

  • Points of similarities between Li and Mg

  • Both are harder and lighter than the other elements in the respective groups.

  • Both react slowly with water; oxides of both are less soluble in water; hydroxides of both decompose on heating.

  • Both form nitrides (Li3N and Mg3N2) by directly reacting with nitrogen.

  • -7
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