MCQ
The strongest acid amongst the following is
- ✓$HCl{O_4}$
- B$HCl{O_3}$
- C$HCl{O_2}$
- D$HClO$
$ + 7$ $ + 5$ $ + 3$ $ + 1$
$HCl{{O}_{4}}>$ $HCl{{O}_{3}}>$ $HCl{{O}_{2}}>$ $HClO$
As the oxidation no. of halogen increases acidic character increases.
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$\begin{array}{*{20}{c}}{CHO}\\|\\{HCOH}\\|\\{HOCH}\\|\\{HCOH}\\|\\{C{H_2}OH}\\I\end{array}$ $\begin{array}{*{20}{c}}{CHO}\\|\\{HCOH}\\|\\{HCOH}\\|\\{HOCH}\\|\\{C{H_2}OH}\\{II}\end{array}$ $\begin{array}{*{20}{c}}{CHO}\\|\\{HCOH}\\|\\{HCOH}\\|\\{HCOH}\\|\\{C{H_2}OH}\\{III}\end{array}$

| List$-I$ | List$-II$ | ||
| $(P)$ | $[Cr(NH_3)_4Cl_2]Cl$ | $(1)$ | Paramagnetic and exhibits ionisation isomerism |
| $(Q)$ | $[Ti(H_2O)_5Cl](NO_3)_2$ | $(2)$ | Diamagnetic and exhibits cis-trans isomerism |
| $(R)$ | $[Pt(en)(NH_3)Cl]NO_3$ | $(3)$ | Paramagnetic and exhibits cis-trans isomerism |
| $(S)$ | $[Co(NH_3)_4(NO_3)_2]NO_3$ | $(4)$ | Diamagnetic and exhibits ionisation isomerism |