MCQ
In Carius method, halogen containing organic compound is heated with fuming nitric acid in the presence of :
- ✓$\mathrm{AgNO}_{3}$
- B$\mathrm{HNO}_{3}$
- C$\mathrm{BaSO}_{4}$
- D$\mathrm{CuSO}_{4}$
Lunar caustic $\left(\mathrm{AgNO}_{3}\right)$ is used as reagent hare to distinguish $\mathrm{Cl}^{-}, \mathrm{Br}$ and $\mathrm{I}^{-}$respectively as follows.
$\mathrm{Cl}^{-}(\mathrm{aq}) \stackrel{\mathrm{AgNO}_{3}}{\longrightarrow} \mathrm{AgCl} \downarrow_{\mathrm{ppt}}$ white
$\mathrm{Br}^{-}(\mathrm{aq})\stackrel{\mathrm{AgNO}_{3}}{\longrightarrow} \mathrm{AgBr} \downarrow_{\mathrm{ppt}} \mathrm{pale}$ yellow
$\mathrm{I}^{-}(\mathrm{aq}) \stackrel{\mathrm{AgNO}_{3}}{\longrightarrow} \mathrm{AgNO}_{3} \mathrm{AgI} \downarrow_{\mathrm{ppt}}$ Dark yellow
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
$\mathrm{A}(l) \rightarrow 2 \mathrm{B}(\mathrm{g})$
$\Delta \mathrm{U}=2.1\; \mathrm{kcal}, \Delta \mathrm{S}=20\; \mathrm{cal} \mathrm{K}^{-1}$ at $300\; \mathrm{K}$
Hence $\Delta \mathrm{G}$ in $\mathrm{kcal}$ is
Statement-$I$: The orbitals having same energy are called as degenerate orbitals.
Statement-$II$: In hydrogen atom, $3 \mathrm{p}$ and $3 \mathrm{~d}$ orbitals are not degenerate orbitals.
In the light of the above statements, choose the most appropriate answer from the options given