Which of the following solutions have different `pH`?
`100mL" of "0.2m" "HCl +100mL" of "0.4 M" "NH_(3)`
`50mL" of "0.1 M" HCl +"50mL" of "03.2 M NH(3)`
`10 mL of 0.3" M "HCl +100mL of 0.6 M NH_(3)`

Options

A. I &ii
B. ii & iii
C. I & iii
D. all will have same `pH`.

Explanation

(a) `{:(NH_(4)OH,+,HCl,rarr,NH_(4)Cl,+,H_(2)O),(0.2M,,0.1,,0.1,,0),(0.1,,0,,0.1,,0.1):}`
`pOH=pK_(b)`
(b) `{:(NH_(4)OH,+,HCl,rarr,NH_(4)Cl,+,H_(2)O),(0.1M,,0.05,,0,,0),(0.05,,0,,0.05,,):}`
`pOH=pK_(b)+log(((0.05)/(0.05)))=pK_(b)`
c `{:(NH_(4)OH,+,HCl,rarr,NH_(4)Cl,+,H_(2)O),(0.3,,0.15,,,,),(0.15,,0,,0.15,,):}`
`pOH=pK_(b)` so all solution have same `pH`.