Select the incorrect statment - Vidyadip

MCQ

Select the incorrect statment

A
Rate of exothermic reactions (irreversible) increases with increase in temperature
B
Rate of endothermic reactions (irreversible) increase with increase in temperature
✓
For $N_2 + 3H_2 \rightleftharpoons 2NH_3$ ; If rate of formation of $NH_3$ is $0.001\ Kg\,hr^{-1}$ , then rate of consumption of $H_2$ is $0.0015\ Kg/hr$
D
In Arrhenius equation $K = A{e^{ - Ea/RT}}$ if $T \to \infty \Rightarrow K = A$

✓

Answer

Correct option: C.

For $N_2 + 3H_2 \rightleftharpoons 2NH_3$ ; If rate of formation of $NH_3$ is $0.001\ Kg\,hr^{-1}$ , then rate of consumption of $H_2$ is $0.0015\ Kg/hr$

c
$-\frac{1}{3} \frac{\mathrm{d}\left[\mathrm{H}_{2}\right]}{\mathrm{dt}}=\frac{1}{2} \frac{\mathrm{d}\left[\mathrm{NH}_{3}\right]}{\mathrm{dt}}$

$\therefore \frac{-\mathrm{d}\left[\mathrm{H}_{2}\right]}{\mathrm{dt}}=\frac{3}{2} \times \frac{0.001}{17} \frac{\mathrm{K\,mole}}{\mathrm{hr}}$

$=\frac{3}{2} \times \frac{0.001}{17} \times 2\, \mathrm{Kg} / \mathrm{hr}$

$=1.76 \times 10^{-4} \,\mathrm{Kg} / \mathrm{hr}$

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