An unknown solution has an H+ concentration of 10-12 moles per litter, so it is a basic in nature. Thus option A is correct.
As per given statement,
H+ = 10-12
And we know that formula for pH is given by:-
pH = -log[H+],
Putting the value of H+ ion in formula:-
pH = -log[10-12]
pH = 12
As per standard chart of pH, when pH varies from 0-6 it is acidic in nature, when it varies from 8-14 it is basic in nature, and when when it is 7 then it is neutral i.e water.
So the unknown solution has 12 pH. so we can say that it is basic in nature. Therefore option A is correct.
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