Which of the following is incorrect about the hydroxides of alkali metals?

Options

A. The hydroxides, which are obtained by the reaction of the oxides with water, react with acids to form salts and water.
B. They react with `CO_(2)` (even traces in the air) forming the carbonates.
C. They react with amphoteric oxides and liberate `NH_(3)` from both ammonium salts and coordination complexes.
D. They are all thermally stable.

Answer

D

Explanation

Except lithium hydroxide, all these hydroxides are thermally stable.
`2LiOHoverset(Delta)rarrLi_(2)O+H_(2)O`
because Li is the least electropositive alkali metal in the anhydrous state.
(1) Their reaction with acids are used for many neutralizations:
`NaOH+HClrarrNaCl+H_(2)O`
(2) LiOH is used to absorb `CO_92)` in closed environments such as space capsules where its light weight is an advantage in reducing the launching weight:
`2LiOH+CO_(2)rarrLi_(2)CO_(3)+H_(2)O`
(3) They react with amphoteric oxides `Al_(2)O_(3), SiO_(2),SnO_(2),PbO_(2)`, and ZnO forming aluminates, silicates, stannates, plumbates, and zincates, respectively.
The bases liberate `NH_(3)`:
`NH_(4)+NaOHrarrNH_(3)+NaCl+H_(2)O`
`2[Co(NH_(3))_(6)]Cl_(3)+6NaOHrarr`
`12NH_(3)+CO_(2)O_(3)+3NaCl+3H_(2)O`