MCQ
The atom of the element having atomic number $ 14 $ should have
- AOne unpaired electron
- ✓Two unpaired electrons
- CThree unpaired electrons
- DFour unpaired electrons
$_{14}Si = 1{s^2}2{s^2}2{p^6}3{s^2}3{p^2}$
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$(i)$ $6C(s) + 3{H_2}(g) \to {C_6}{H_6}(l);\,\Delta H = + 45.9\,kJ$
$(ii)$ ${H_2}(g) + \frac{1}{2}{O_2}(g) \to {H_2}O(l);\,\Delta H = - 285.9\,kJ$
$(iii)$ $C(s) + {O_2}(g) \to C{O_2}(g);\,\Delta H = - 393.5\,kJ$
........$kJ$
