- ✓$1$
- B$2$
- C$3$
- D$4$
Although Boric acid contains 3 OH groups yet it can act as monobasic acid rather than tribasic acid. This is because boric acid does not act as a proton donor rather it accepts a pair of
electrons from $\mathrm{OH}^{-}$ ions.
It does not donate $\mathrm{H}^{+}$ rather it accepts an electron pair from the solution or the donor i.e. $\mathrm{OH}^{-}$
Thus, Boric acid is an aprotic acid (like lewis acid) and monobasic acid.
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Assertion $A :$- Carbon forms two important oxides $- CO$ and $CO _2 . CO$ is neutral whereas $CO _2$ is acidic in nature.
Reason $R :$- $CO _2$ can combine with water in a limited way to form carbonic acid, while $CO$ is sparingly soluble in water.
In the light of the above statements, choose the most appropriate answer from the options given below :-
$A\, \rightleftharpoons \,B$ ${K_C} = 2$
$B\, \rightleftharpoons \,C$ ${K_C} = 3$
$C\, \rightleftharpoons \,D+E$ ${K_C} = 5$
$K_C$ for the reaction $A\, \rightleftharpoons \,D+E$ is