1) is "thermal stability" the same as just "stability" ? if yes , then since "more acidic" means "less stable" , thermal stability of HClO4 should be low compared to HClO , but this is not the case.

 

2) how do u decide oxidising power ? eg- oxidising power of ClO- is more than ClO4- , but this seems illogical as ClO4- has so many "O"s to give away !

 

3) why is HI a stronger acid than HCl but oxyacids of Iodine weaker than the corresponding Chloro-oxyacids ?

 

all info courtesy OP Agarwal - JPNP.  any answer with a semblance of correctness will be rated :) :) :) ty !