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20 mL of 0.1 MH2SO4 solution is added to 30 mL of 0.2 M NH4OH solution. The pH of the resulatant mixture is : [pkb of NH4OH = 4.7]. 

(1) 9.4 

(2) 5.0 

(3) 9.0 

(4) 5.2

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