Hydrazine, $\text{N}_2\text{H}_4$, is used extensively as a rocket fuel because it reacts with oxygen in the way shown, forming ‘environmentally friendly’ gases. $\text{N}_2\text{H}_4(l) + \text{O}_2(g) \rightarrow \text{N}_2(g) + 2\text{H}_2\text{O}(g) \quad \Delta H = -534\,\text{kJ mol}^{-1}$ Even though hydrazine is employed as a rocket fuel, it does not ignite of its own accord in oxygen. Which statement accounts for why hydrazine does not burn spontaneously?
- AHydrazine is a liquid.
- BThe activation energy is too high.
- CThe $\text{N}\equiv\text{N}$ bond is very strong.
- DThe reaction is exothermic.