MCQ
$\text{H}_2\text{O}(\text{l})+\text{H}_2\text{O}(\text{l})\xrightarrow{\ \ \ \ \ \ \ \ \ \ }\text{H}_3\text{O}^+(\text{aq})+\text{OH}^-(\text{aq})\\\ \ ^\text{Acide-1}\ \ \ \ \ \ ^\text{Base-2}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ ^\text{Acide-2}\ \ \ \ \ \ \ \ \ ^\text{Base-1}\\ \ \ ^\text{(Acid)}\ \ \ \ \ \ \ ^\text{(Base)}\ \ \ \ \ \ \ \ \ \ \ \ \ \ ^\text{(Conjugate acide)}\ \ ^\text{(Conjugate base)}$ The above reaction is known as:
  • A
    Auto$-$protolysis of water.
  • B
    Self$-$ionisation of water.
  • C
    Hydration of water.
  • Both $(a)$ and $(b)$

Answer

Correct option: D.
Both $(a)$ and $(b)$
The auto$-$protolysis $($self$-$ionisation$)$ of water takes place as follows.
$\text{H}_2\text{O}(\text{l})+\text{H}_2\text{O}(\text{l})\xrightarrow{\ \ \ \ \ \ \ \ \ \ }\text{H}_3\text{O}^+(\text{aq})+\text{OH}^-(\text{aq})\\\ \ ^\text{Acide-1}\ \ \ \ \ \ ^\text{Base-2}\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ ^\text{Acide-2}\ \ \ \ \ \ \ \ \ ^\text{Base-1}\\ \ \ ^\text{(Acid)}\ \ \ \ \ \ \ ^\text{(Base)}\ \ \ \ \ \ \ \ \ \ \ \ \ \ ^\text{(Conjugate acide)}\ \ ^\text{(Conjugate base)}$

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