Difficult
$A$ vapor at atmospheric pressure is gradually heated from $25\,^oC$. Initially,its color deepens,but above $160\,^oC$,the color fades. At $600\,^oC$,the vapor becomes almost colorless. However,increasing the pressure at this temperature makes the color deep again. What is this vapor?
- ABromine
- B$A$ mixture of $NO_2$ and $N_2O_4$
- CPure $NO_2$
- DPure $N_2O_4$
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