MCQ
An electron has magnetic quantum number as $-3.$ Its principal quantum number can be
- A$1$
- B$2$
- C$3$
- ✓$4$
When $m =-3,l=3 \quad \therefore n =4$
Note: For a given value of $n, 1$ can have values $0,1,2, \ldots . .(n-1)$ and $m$ can have values $-l, \ldots .-2,-1,0,+1,+2 \ldots+l$.
For $n=4,l$ can have values $0,1,2,3$.
For a given value of $l, m$ can have values $-3,-2,-1,0,+1,+2,+3$.
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$\mathrm{Cd}_{(s)}+\mathrm{Hg}_{2} \mathrm{SO}_{4(s)}+\frac{9}{5} \mathrm{H}_{2} \mathrm{O}_{(l)} \rightleftharpoons \mathrm{CdSO}_{4} \cdot \frac{9}{5} \mathrm{H}_{2} \mathrm{O}_{(s)}+2 \mathrm{Hg}_{(l)}$
The value of $\mathrm{E}_{\text {cell }}^{0}$ is $4.315\, \mathrm{~V}$ at $25^{\circ} \mathrm{C}$. If $\Delta \mathrm{H}^{\circ}=-825.2\, \mathrm{~kJ} \,\mathrm{~mol}^{-1}$, the standard entropy change $\Delta \mathrm{S}^{\circ}$ in $\mathrm{J} \,\mathrm{K}^{-1}$ is ........ . (Nearest integer) [Given : Faraday constant $=96487\, \mathrm{C}\, \mathrm{mol}^{-1}$ ]