a)△H for the reaction of NaOH and HCl solutions will be the same as △H for reaction of KOH and HNO3 solutions because the net ionic equation is the same in each case.

b)△H for the reaction of NaOH and HCl solutions will be different from △H for the reaction between LiOH and HBr because different salt is formed.

I think a is true and b is false...

If not... I will think about it again please tell me >0<

a) Yes, the only reacting species are the H^+\ and\ OH^- ions. The other ions are called spectator ions and don not take part in the reaction.

b) Correct too, the same thing as above occurs.

If however, there was a precipitate, then there would be a difference because the formation of a precipitate involves heat release.

Sorry I am unable understand about a symbol [] but if it is sign of enthalpy then try
A is right but b I think wrong because al strong acid when react with strong base produce same heat of neutrilization its due same net ionic reaction value of heat of neutrelization is ^H= -57.1 kJ
----------------------------------------------------------pramod awasthi