1.

Aqueous solution of orthoboric acid can be titrated against sodium hydroxide using phenolphthaleinindicator only in presence of :

Answer»

trans-glycerol
catechol
cis-glycerol
both (B) and (C )

Solution :It FORMS a stable cyclic complex with POLYHYDROXY COMPOUNDS LIKE cis-glycerol, cathechol, etc. This HELPS in the release of `H^+` as `H_3O^+` and , therefore, boric acid acts as a strong acid and hence can be titrated with sodium hydroxide using phenolphthalein.


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