Question

Identify the incorrect statement from the following : 

(1) The acidic strength of HX (X = F, Cl, Br and I) follows the order : HF > HCl > HBr > HI.

(2) Fluorine exhibits –1 oxidation state whereas other halogens exhibit +1, +3, +5 and +7 oxidation states also. 

(3) The enthalpy of dissociation of \(F_2\) is smaller than that of \(Cl_2\). 

(4) Fluorine is stronger oxidising agent than chlorine.

Answer 1

Correct option is (1) The acidic strength of HX (X = F, Cl, Br and I) follows the order : HF > HCl > HBr > HI.

The acidic strength of HX follows the order HF < HCl < HBr < HI 

This is because bond enthalpy of hydrides of group 17 decreases down the group.