Question

Which of the following decomposes to form lithium oxide, `Li_(2)O`?
A. `LiOH`
B. `Li_(2)CO_(3)`
C. `LiNO_(3)`
D. all of these

Answer 1

Correct Answer - D
LiOH and `Li_(2)CO_(3)` are thermally unstable unlike the corresponding compound of other alkali metals.
`2LiOHtoLi_(2)O+H_(2)O`
`Li_(2)CO_(3)toLi_(2)O+CO_(2)`
Lithium nitrate on heating decomposes to give `Li_(2)O` while nitrates of other alkali metals decompose to yield nitrites:
`4LiNO_(3)overset(Delta)to2Li_(2)O+4NO_(2)+O_(2)`
`2NaNO_(3)overset(Delta)to2NaNO_(2)+O_(2)`