10−5 M NaOH solution at 25∘C is diluted 1000  times. The pH of the resultant solution will:

For given NaOH solution, POH = 5For every 10 fold dilution POH increases by 1 unitAfter 1000times dilution, POH = 5+3=8, but it is not possible for a base.∴Resultant POH = lie between 6 and 7 and PH = lie between 7 and 8.