A sealed glass tube initially containing only brown NO₂ gas gradually lightens in…

CHEMISTRY · Subjective · A Level · Chemistry · Chemical equilibria (Le Chatelier’s principle and Kc) · Chemical equilibria (Le Chatelier’s principle and Kc)

Problem

A sealed glass tube initially containing only brown NO₂ gas gradually lightens in color until it appears constant, even though no gas escapes. Explain why the color remains unchanged while individual NO₂ molecules continue to react inside the tube.

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