JEE Main 2019 Chemistry question
20 mL of 0.1 M HSO solution is added to 30 mL of 0.2 M NHOH solution. The pH of the resultant mixture is: [pK of NHOH = 4.7]
Answer: (C)
Solution
4 mmol H + 6 mmol NHOH → 4 mmol NH + 2 mmol NHOH; pOH = 4.7 + log 2 = 5.0; pH = 9.0.