Question

Iron (III) ions, Fe3+, react with thiocyanate ions, SCN-, in a reversible reaction to form a red solution. Which changes to the equilibrium will make the solution go red?

  Fe3+(aq) + SCN-(aq)               [FeSCN]2+(aq)  ∆ H  = +ve

Yellow                                                        Red

I  - Increasing the temperature II  -  Adding FeCl3 III  -  Adding a catalyst

A.   I and II only B.   I and III only

C.   II and III only D.   I, II and III

Answer 1

A. I and II only