# Which metal bicarbonates do not exist in solid state?

$$\ce{(i) LiHCO_3 (ii) Ca(HCO_3)_2 ​ (iii) Zn(HCO_3)_2 ​ (iv) AgHCO_3}$$ From my prior knowledge compounds i and ii are not solids because of the high hydration energy of Li and the high polarizing power of Ca respectively. But the answer to this question includes both options iii and iv. Which property makes them not solid/exist in solution state?

• Regarding LiHCO3, see these questions: chemistry.stackexchange.com/questions/73575/… .... chemistry.stackexchange.com/questions/69331/… Nov 18 '20 at 4:02
• Too bad your teacher forgot to give you his list that you can learn by heart. What a moronic multiple choice question.
– Karl
Nov 18 '20 at 7:59
• The only existing carbonate at the solid state is LiHCO3. Nov 18 '20 at 9:08
• @Maurice LiHCO3 does not exist in solid state Nov 18 '20 at 11:02
• @Singularity. The Handbook of Chemistry and Physics, 43 rd Ed, p. 597, informs that LiHCO3 is white and its solubility is 5.5 g in 100 mL water at 13°C. Nov 18 '20 at 17:04