Question

In the reaction N2O4(g) 2NO2(g), what changes in color would you expect as pressure is increased at constant temperature?

Answer 1

becomes lighter

Step-by-step explanation:

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Answer 2

Brown color of the solution decreases

Step-by-step explanation:

`NO_2` is brown in color whereas
`N_2O_4` is colorless.

Equilibrium reaction between
`NO_2` and
`N_2O_4` is as follows:

`2NO_2\leftrightharpoons N_2O_4`

As per the Le Chatelier's principle, if pressure of a equilibrium is increased, the equilibrium will shift in the direction having fewer no. of moles of gases.

In the given equilibrium,
`NO_2` side has more no. of moles. So on increasing pressure, equilibrium will shift towards the side of
`N_2O_4` or more formation of
`N_2O_4` will take place.

Therefore, more
`NO_2` will decompose that will decrease the brown color of the solution as
`N_2O_4` is colorless.