| Date | May 2014 | Marks available | 1 | Reference code | 14M.1.sl.TZ2.21 |
| Level | SL | Paper | 1 | Time zone | TZ2 |
| Command term | Question number | 21 | Adapted from | N/A |
Question
Which compound reacts with calcium oxide, CaO?
A. \({{\text{K}}_{\text{2}}}{\text{O}}\)
B. \({\text{N}}{{\text{a}}_{\text{2}}}{\text{O}}\)
C. \({\text{S}}{{\text{O}}_{\text{2}}}\)
D. MgO
Markscheme
C
Examiners report
This question assumed an understanding of Periodicity (3.3.2) and Acid-Base (8.2.1). The majority of candidates (69%) had no difficulty in determining that calcium oxide is a basic oxide and choosing the only acidic oxide, sulfur dioxide, as the answer.
