MCQ
For the reaction at $300\,K$
$A(g) + B(g) \to C(g)$ $\Delta U=\,-\,3\,Kcal$
$\Delta S=\,-\,10\,cal/K$
value of $\Delta G$ will be ......$cal$
- ✓$-600$
- B$-6600$
- C$-6000$
- D$-60$
$A(g) + B(g) \to C(g)$ $\Delta U=\,-\,3\,Kcal$
$\Delta S=\,-\,10\,cal/K$
value of $\Delta G$ will be ......$cal$
Explanatlon:
$A ( g )+ B ( g ) \rightarrow C$
$\Delta E=-3 k Cal$
$\Delta H =\Delta E +\Delta_{ ng } R$
$=-3-\frac{1 \times 1.987 \times 300}{1000}$
$\Delta H =-3.60$
$\Delta H =\Delta H - T \Delta S$
$=-3.5+\frac{300 \times-10}{1000} 0.6 k cal$
$\Rightarrow 600 cal$
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$MgO(s) + C(s) \to Mg(s) + CO(g)$, for which $\Delta _r{H^o} = + 491.1\,kJ\,mo{l^{ - 1}}$ and $\Delta _r{S^o} = 198.0\,Jk^{-1}\,mo{l^{ - 1}}$ is not feasible at $298\, K$. Temperature above which reaction will be feasible is.....$K$
| List-$I$ (Molecule) | List-$II$(Shape) |
| $A$ $\mathrm{NH}_3$ | $I$ Square pyramid |
| $B$ $\mathrm{BrF}_5$ | $II$ Tetrahedral |
| $C$ $\mathrm{PCl}_5$ | $III$ Trigonal pyramidal |
| $D$ $\mathrm{CH}_4$ | $IV$ Trigonal bipyramidal |
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