The rate of a chemical reaction can be increased by adding a suitable catalyst. Which of these reactions can make use of a heterogeneous catalyst? 1 $\text{N}_2 + 3\text{H}_2 \rightleftharpoons 2\text{NH}_3$ 2 $2\text{SO}_2 + \text{O}_2 \rightleftharpoons 2\text{SO}_3$ 3 $2\text{NO} + 2\text{CO} \rightleftharpoons \text{N}_2 + 2\text{CO}_2$
- A1, 2 and 3 are correct
- B1 and 2 only are correct
- C2 and 3 only are correct
- D1 only is correct