MCQ
___________ element has one electron in its outermost shell and attains duplet configuration after one more electron and attains stability.
- ✓Hydrogen
- BFluorine
- CHelium
- DBerrylium
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$(a)$ Polarising power of cation
$(b)$ Extent of distortion of anion
$(c)$ Polarisability of the anion
$(d)$ Polarising power of anion
$C(s) + O_2(g) \to CO_2(g) + x\ kJ$
$CO(g) + \frac {1}{2}O_2(g) \to CO_2(g) + y\,kJ$
The heat of formation of $CO(g)$ is