Cooling a mixture of equal parts nitric oxide and nitrogen dioxide to −21 °c produces what?

Cooling a mixture of equal parts nitric oxide and nitrogen dioxide to −21 °c produces what?

Correct Answer: dinitrogen trioxide
carbon trioxide
nitrate trioxide
chloride trioxide

Explanation: Cooling a mixture of equal parts nitric oxide and nitrogen dioxide to −21 °C produces dinitrogen trioxide, a blue liquid consisting of N2O3 molecules (shown in Figure 18.35). Dinitrogen trioxide exists only in the liquid and solid states. When heated, it reverts to a mixture of NO and NO2.

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