Which chemical equation does not represent a disproportionation reaction?
2NO2(g)+H2O(l)→HNO3(aq)+HNO2(aq)2\text{NO}_2(\text{g}) + \text{H}_2\text{O}(\text{l}) \rightarrow \text{HNO}_3(\text{aq}) + \text{HNO}_2(\text{aq})2NO2(g)+H2O(l)→HNO3(aq)+HNO2(aq)
Cl2(g)+2NaOH(aq)→NaCl(aq)+NaClO(aq)+H2O(l)\text{Cl}_2(\text{g}) + 2\text{NaOH}(\text{aq}) \rightarrow \text{NaCl}(\text{aq}) + \text{NaClO}(\text{aq}) + \text{H}_2\text{O}(\text{l})Cl2(g)+2NaOH(aq)→NaCl(aq)+NaClO(aq)+H2O(l)
IO3−(aq)+5I−(aq)+6H+(aq)→3I2(aq)+3H2O(l)\text{IO}_3^-(\text{aq}) + 5\text{I}^-(\text{aq}) + 6\text{H}^+(\text{aq}) \rightarrow 3\text{I}_2(\text{aq}) + 3\text{H}_2\text{O}(\text{l})IO3−(aq)+5I−(aq)+6H+(aq)→3I2(aq)+3H2O(l)
3MnO42−(aq)+4H+(aq)→2MnO4−(aq)+MnO2(s)+2H2O(l)3\text{MnO}_4^{2-}(\text{aq}) + 4\text{H}^+(\text{aq}) \rightarrow 2\text{MnO}_4^-(\text{aq}) + \text{MnO}_2(\text{s}) + 2\text{H}_2\text{O}(\text{l})3MnO42−(aq)+4H+(aq)→2MnO4−(aq)+MnO2(s)+2H2O(l)
199 exam-style questions on OCR A A Level Chemistry Atoms and reactions, covering Atomic structure and isotopes, Compounds, formulae and equations, Amount of substance, Acids, and Redox. Each one has a worked solution and a mark scheme showing where the marks go.