Get premium membership and access revision papers with marking schemes, video lessons and live classes.

Processing. Please wait.

At #20^(0)#C, #NO_2 and N_2O_4# gases exist in equilibrium as shown in the equation below.
#2NO_2(g) overset(rightarrow)(leftarrow) N_2O_4(g)# ; = -ve
Brown Pale yellow
State and explain the observation that would be made when ;
(a) A syringe containing the mixture at #20^(0)#C is immersed in ice-cold water.
(b) The volume of the gaseous mixture in a syringe is reduced.

Answer Text:
(a) Observation :
- Pale yellow colour intensifies.
Reason:
Forward reaction is exothermic hence lowering temperature shifts the equilibrium to the right.
(b) Observation:
Pale yellow colour intensifies
Reason:
Reducing the volume of syringe increases the pressure hence the equilibrium shifts to the right.