`N_(2)(g)` and `H_(2)(g)` are allowed to react in a closed vessel at given temp. and pressure for the formation of `NH_(3)(g),[N_(2)(g)+3H_(2)(g)hArr2NH_(3)(g)+22.4kcal]` If He (g) is added at equilibrium at constant pressure than which is/are correct ?
A
Concentration of `N_(2)(g),H_(2)(g)` and `NH_(3)(g)` decrease.
B
Moles of `NH_(3)(g)` decreases.
C
The extent of cooling depends on amount of he (g) added.
D
Concentration of `N_(2)` and `H_(2)` increases and concentration of `NH_(3)` decreases.
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