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Which is/are correct statements about fo...

Which is/are correct statements about following equilibrium?
`N_(2)O_(4)(g) rightarrow 2NO_(2) (g)` `Delta _(r) H =+ve`

A

Degree of dissociation of `N_(2)O_(4) (g)` increase when temperature increase.

B

Vapour density of gaseous mixture decrease when temperature increase

C

Partial pressure of `NO_(2)` decrease when Helium gas added under constant pressure

D

Partial pressure of `N_(2)O_(4)` increase when Helium gas added under constant volume.

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