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a. Monoxides of all alkali metals are hy...

a. Monoxides of all alkali metals are hydrolysed by water, but lithium monoxide is slowly hydrolysed. Why?
b. Predict the product of the product of the hydrolysis of `KO_(2)`.
c. Which of the following is paramagnetic: `K_(2)O, K_(2)O_(2), KO_(2)`
d. Caesium oxide is expected to be strongly basic, weakly basic or acidic.

Text Solution

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a. Lithium monoxide is highly stable due to its highly lattice energy (lattice energy `prop 1//r_(o+) + r_(Θ))`.
b. `2KO_(2)+2H_(2)O rarr 2KOH + H_(2)O_(2)+O_(2)`
c. `KO_(2)` is paramagnetic, due to the presence of an unpaired electron in `O_(2)^(Θ)` (superoxide ion).
d. Caesium oxide is strongly basic.
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