`1` mole each of `H_(2)(g) "and" I_(2)(g)` are introduced in a `1L` evacuated vessel at `523K` and equilibrium`H_(2)(g)+I_(2)(g)hArr2Hi(g)` is established. The concentration of `HI(g)` at equilibrium:

Options

A. Changes on changing pressure.
B. Changes on changing temperature.
C. Changes on changing volume of the vessel
D. Is same even if only `2` mol of `HI(g)` were introduced in the vessel in the beginning.
Is same even when a platinum gauze is introduced to catalyst the reaction.

Answer

A, B, C, D

Explanation

`H_(2)(g)+I_(2)(g)hArr2HI(g)`
(A) For changing pressure volume has to be changed, though number of moles of `HI(g)` do not get changed but its concentration will get changed.
(B) Temperature change will change `K_(P)` and hence concentration.
(C) Volume change will change concentration, not the number of moles.
(D) Same equilibrium will be attained from either direction.
Catalyst does not change equilibrium concentration.