Question

A base is a substance which

• A. donate a lone pair of electron(Lewis concept)
• B. accepts a proton ( Lowry and Bronsted concept)
• C. (a) and (b) above.
• D. None of the above

Answer 1

The correct option is C (a) and (b) above.

According to Lewis concept, base is a ion or molecule which can donate a pair of electron.
for example - $N{H}_3$ etc.
According to Lowry and Bronsted concept, acids are ion or molecule which has tendency to accept proton.
for example- $N{H}_3\left(aq\right)+H^{+}\left(aq\right)\rightleftharpoons N{H}_4^{+}\left(aq\right)$