Consider the following complexes

(A) $$\left[\mathrm{CoCl}\left(\mathrm{NH}_3\right)_5\right]^{2+}$$, (B) $$\left[\mathrm{Co}(\mathrm{CN})_6\right]^{3-}$$, (C) $$ \left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5\left(\mathrm{H}_2 \mathrm{O}\right)\right]^{3+} $$, (D) $$\left[\mathrm{Cu}\left(\mathrm{H}_2 \mathrm{O}\right)_4\right]^{2+}$$

The correct order of A, B, C and D in terms of wavenumber of light absorbed is :

Functional group present in sulphonic acids is :

Match List I with List II

Choose the correct answer from the options given below:

Given below are two statements :

Statement I : Gallium is used in the manufacturing of thermometers.

Statement II : A thermometer containing gallium is useful for measuring the freezing point $$(256 \mathrm{~K})$$ of brine solution.

In the light of the above statements, choose the correct answer from the options given below :