Explain the following with proper reason:
(i) Anhydrous HCl is a bad conductor of electricity while aqueous HCl is a good conductor.
(ii) HF is not stored in glass bottles but kept in wax lined bottles.
(iii) HF has a greater electronegativity difference and more ionic character than HCI, HBr and Hl but it the weakest acid.

Explanation

(i)In anhydrous state , HCl is a covalent molecule. In aqueous solution , HCl combines with water molecule to form `H_3O^+` and `Cl^-`(aq)
(ii)HF attacks glass bottles, The sodium and potassium silicates are converted into flurosilicates
`Na_2 SiO_3 + 6HF to Na_2 SiF_6 + 3H_2O`
(iii)The weakest acidic nature of HF is due to :
High bond dissociation enthalpy of HF bond
HF has conjugate base `F^-` Small size and concentrated charge make `F^-` a Lewis base. Hence, it can accept back `H^+`