Question

The bicarbonate of which alkali metal does not exist as a solid?

• A. K
• B. Na
• C. Li
• D. Cs

Hint:

Lithium compounds often show different behaviors compared to other alkali metals due to lithium's small ionic size and high charge density, affecting its solubility and stability in various compounds.

Answer 1

The Correct Option is C

Step 1: Analyze the properties of alkali metal bicarbonates. Alkali metal bicarbonates typically form solids except for lithium bicarbonate (\({LiHCO}_3\)), which cannot be isolated as a solid under normal conditions and typically exists only in solution. 
Step 2: Choose the correct option based on known chemical properties. Lithium bicarbonate's inability to form a solid is due to its highly soluble and unstable nature in solid form compared to other alkali metal bicarbonates like sodium (\({NaHCO}_3\)) or potassium (\({KHCO}_3\)) bicarbonates.