When the first element of the periodic table is treated with dioxygen, it gives a compound whose solid-state floats on its liquid state. This compound has an ability to act as an acid as well as a base. What products will be formed when this compound undergoes autoionisation ?

Answers (1)

The first element is Hydrogen, and its molecular form is dihydrogen, so when it reacts with oxygen, it forms water, which is physical solid-state is ice and has a density lower than water, so it floats on water. Water has an amphoteric nature which acts as a base went around acids and vice versa.

H_{2}O (as\;an\; acid) + NH_{3} \rightarrow NH4^{+} + OH^{-} (aq)

H_{2}O (as \;a\; base) + H_2S \rightarrow H_{3}O^{+} + HS^{-}

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