MCQ
$Fe$ (atomic number $ = 26$ ) atom has the electronic arrangement
- A$2, 8, 8, 8$
- B$2, 8, 16$
- ✓$2, 8,14, 2$
- D$2, 8, 12, 4$
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$S{O_2} + \frac{1}{2}{O_2} \to S{O_3} + y\,kcal$
Find out the heat of formation of $S{O_2}$

[Use mass of electron $\left.=9.1 \times 10^{-31}\, \mathrm{~kg}, \mathrm{~h}=6.63 \times 10^{-34}\, \mathrm{~J} \mathrm{~s}, \pi=3.14\right]$