MCQ
One mole of Argon is heated using $PV^{5/2} =$ constant. By what amount heat is absorbed during the process, when temperature changes by $\Delta T = 26\ K$ ......$J$
- A$100$
- B$200$
- ✓$180$
- D$208$
$\mathrm{PV}^{5 / 2}=$ constant $, \mathrm{n}=5 / 2$
$\mathrm{q}=\mathrm{n} \mathrm{C} \Delta \mathrm{T}$
$ = {\text{n}}\left[ {{{\text{C}}_{\text{v}}} + \frac{{\text{R}}}{{1 - {{\text{n}}^\prime }}}} \right]\therefore \,\Delta {\text{T}}$
$=1\left[\frac{3}{2} R+\frac{R}{1-\frac{5}{2}}\right]$
$=\left[\frac{3}{2} R-\frac{2}{3} R\right] 26$
$=\frac{5}{6} \mathrm{R} \times 26=\frac{5 \times 8.314 \times 26}{6}=180\, \mathrm{J}$
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$(A)$ Uncertainty principle rules out the existence of definite paths for electrons.
$(B)$ The energy of an electron in $2 s$ orbital of an atom is lower than the energy of an electron that is infinitely far away from the nucleus.
$(C)$ According to Bohr's model, the most negative energy value for an electron is given by $n=1$, which corresponds to the most stable orbit.
$(D)$ According to Bohr's model, the magnitude of velocity of electrons increases with increase in values of $n$.
Find alkene
$C(g) + 4H(g) \to C{H_4}(g),\,\Delta H = - {x_1}\,k\,cal$
$C{H_4}(g) \to C{H_3}(g) + H(g),\,\Delta H = + y\,k\,cal$
The bond energy of $C - H$ bond is