MCQ
The substance that has the lowest boiling point is
- A$HCl$
- B$H_2S$
- C$PH_3$
- ✓$SiH_4$
$H _2 S$ boiling point $216\, K$.
$HCl$ boiling point $188\, K$.
$PH _3$ boiling point $185\, K$
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$\Delta E = - 2.0 \times {10^{ - 18}}\,J\left( {\frac{1}{{n_2^2}} - \frac{1}{{n_1^2}}} \right)$
the wavelength of the light that must be absorbed to excite hydrogen electron from level $n\, = 1$ to level $n\, = 2$ will be: $(h\, = 6.625\times10^{-34}\, J\,s,\, C\, = 3\times10^8\, m\,s^{-1})$
$[HCl=36.5; {(N{H_4})_2}S{O_4}=132; N{H_3}=17]$
$[IMAGE]\,\,\xrightarrow{{{C_2}{H_5}OH/\Delta }}$