Exams › JEE Advanced › Chemistry
Which of the following statements about lithium are NOT CORRECT?
- Lithium hydrogen carbonate (LiHCO3) exists in solid form
- Lithium carbonate is the most thermally stable carbonate among Group IA metals
- The main product when lithium burns in excess oxygen is LiO2
- Lithium chloride is soluble in pyridine
Correct answer: Lithium carbonate is the most thermally stable carbonate among Group IA metals
Solution
LiHCO3 exists only in solution, not as a solid (statement A is NOT correct). Li2CO3 is the LEAST thermally stable Group IA carbonate due to Li+'s high charge density polarizing CO3²-, making it easy to decompose (statement B is NOT correct). Li burns in O2 to give Li2O as the main product, not LiO2 (statement C is NOT correct - Na gives Na2O2, K gives KO2). LiCl is soluble in pyridine due to its covalent character (statement D IS correct). So A, B, and C are all NOT correct for lithium.
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