- ✓$NO$ gas
- B$NO_2$ gas
- C$N_2$ gas
- D$O_2$ gas
$3 \mathrm{Ag}+4 \mathrm{HNO}_{3}(\mathrm{dil}) \rightarrow 3 \mathrm{AgNO}_{3}+2 \mathrm{H}_{2} \mathrm{O}+\mathrm{NO} \uparrow$
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| List-I Complex | List-II Primary valency and Secondary valency | ||
| (A) | $\left[\mathrm{Co}(\mathrm{en})_{2} \mathrm{Cl}_{2}\right] \mathrm{Cl}$ | (I) | 3 $\quad$ 6 |
| (B) | $\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}\left(\mathrm{NO}_{2}\right)\right]$ | (II) | 3 $\quad$ 4 |
| (C) | $\mathrm{Hg}\left[\mathrm{Co}(\mathrm{SCN})_{4}\right]$ | (III) | 2 $\quad$ 6 |
| (D) | $[\mathrm{Mg}(\mathrm{EDTA})]^{2-}$ | (IV) | 2 $\quad$ 4 |
$A$. Hydrogen bonding exists when $\mathrm{H}$ is covalently bonded to the highly electro negative atom.
$B$. Intermolecular $\mathrm{H}$ bonding is present in o-nitro phenol
$C$. Intramolecular $\mathrm{H}$ bonding is present in $\mathrm{HF}$.
$D$. The magnitude of $\mathrm{H}$ bonding depends on the physical state of the compound.
$E$. H-bonding has powerful effect on the structure and properties of compounds.
Choose the correct answer from the options given below :

$A$. Column chromatography
$B$. Thin layer chromatography
$C$. Paper chromatography
Choose the most appropriate answer from the options given below: