When the first element of the periodic table is treated with dioxygen,

1.	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?
Answer» The first element is hydrogen and its molecular form is dihydrogen (H₂). It reacts with oxygen to form water whose solid state is ice which is lighter than water and floats over water. Water is amphoteric in nature, i.e., it acts as an acid in the presence of strong bases and acts as a base in the presence of strong acids. As an acid H₂O(l)+NH₃(aq) → NH⁺₄(aq)+OH^-(aq) acid base As a base H₂O(l)+H₂S(aq) → H₃O⁺ + HS^- Due to amphoteric nature,water undergoes self ionization as H₂O+H₂O → H₃O⁺ + OH^-

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?

Answer»

The first element is hydrogen and its molecular form is dihydrogen (H₂). It reacts with oxygen to form water whose solid state is ice which is lighter than water and floats over water.
Water is amphoteric in nature, i.e., it acts as an acid in the presence of strong bases and acts as a base in the presence of strong acids.

As an acid
H₂O(l)+NH₃(aq) → NH⁺₄(aq)+OH^-(aq)
acid base
As a base
H₂O(l)+H₂S(aq) → H₃O⁺ + HS^-
Due to amphoteric nature,water undergoes self ionization as
H₂O+H₂O → H₃O⁺ + OH^-

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