What happens when:
a. Potassium metal is dropped in water
b. Potassium is heated in free supply of air
c. Potassium superoxide is dissolved in water

Explanation

a. When the potassium metal is dropped in water is dropped in reacts readily with water to form potassium hydroxide and hydrogen gas is evolved.
`2K_((s))+2H_(2)O rarr 2KOH_((s))+H_(2(g))uarr`
b. When the potassium metal is heated in free supply of air, it burns vigorously in air form superoxide.
`K_((s))+O_(2(g))rarr KO_(2(g))`
c. when potassium superoxide dissolved in water, it forms `KOH, H_(2)O_(2)` and `O_(2)`.
`2KO_(2)+2H_(2)O rarr 2KOH+H_(2)O rarr 2KOH+H_(2)O_(2)+O_(2)`