If the boiling point of H₂O is 373 K, the boiling point of H₂S will be :

Amongst the following, the form of water with the lowest ionic conductance at 298 K is :

Among the statements (a) - (d), the correct ones are :
(a) Decomposition of hydrogen peroxide gives dioxygen.
(b) Like hydrogen peroxide, compounds, such as KCIO₃, Pb(NO₃)₂ and NaNO₃ when heated liberate dioxygen.
(c) 2-Ethylanthraquinone is useful for the industrial preparation of hydrogen peroxide.
(d) Hydrogen peroxide is used for the manufacture of sodium perborate.

In comparison to the zeolite process for the removal of permanent hardness, the synthetic resins method is :