Question

The following reaction is at equilibrium:

2 Fe(OH)₃(s) ↔ Fe₂O₃(s) + 3 H₂O(g); H^o > 0.

Which of the following changes will result in an increase in the concentration of water (gas)?

	a.	Adding a catalyst.
	b.	Increasing pressure.
	c.	Removing some Fe(OH)3.
	d.	Increasing the volume.
	e.	Adding some Fe2O3.
	f.	Decreasing the temperature.

Answer 1

(a) adding a catalyst will increase the reaction rate. As a result concentration of water (g) will increase.

(b) increasing pressure will shifht the reaction to reverse direction.

c) romoving some Fe(OH)3 will shift the reaction to reverse direction.

(d) increasimg volume will shift the reaction to reverse direction.

(e) Adding some Fe2O3 will shift the reaction to reverse direction.

(f) This is an endothermic reaction as H is +ve. So, decreasing the tempearture will shift the reaction to reverse direction.

Correct answer : a