| Date | May 2011 | Marks available | 1 | Reference code | 11M.1.sl.TZ2.20 |
| Level | SL | Paper | 1 | Time zone | TZ2 |
| Command term | Identify | Question number | 20 | Adapted from | N/A |
Question
Which is not a conjugate acid-base pair?
A. \({\text{HN}}{{\text{O}}_{\text{3}}}\) and \({\text{NO}}_3^ - \)
B. \({\text{C}}{{\text{H}}_{\text{3}}}{\text{COOH}}\) and \({\text{C}}{{\text{H}}_{\text{3}}}{\text{CO}}{{\text{O}}^ - }\)
C. \({{\text{H}}_{\text{3}}}{{\text{O}}^ + }\) and \({\text{O}}{{\text{H}}^ - }\)
D. \({\text{HSO}}_4^ - \) and \({\text{SO}}_{{\text{42}}}^{2 - }\)
Markscheme
C
Examiners report
[N/A]
