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20 mL of 0.1 M H 2 SO 4 solution is added to 30 mL of 0.2 M NH 4 OH solution. The pH of the resultant mixture is : [pK b of NH 4 OH = 4.7].

1. 5.2
2. 9.4
3. 9.0
4. 5.0

Correct answer: 9.0

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