MCQ
The group valence of the element is generally equal to the:
- ANumber of dots in Lewis symbol.
- BEight minus the number of dots.
- CValence electrons.
- DAny of the above may possible.
Explanation:
The group valence of the elements is generally equal to either the number of dots in Lewis symbols or eight minus the number of dots or valence electrons.
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Compound $(B)$ in above reaction is

$NH_4HS(s) \rightleftharpoons NH_3(g)+H_2S(g)$
is following to set up at $127\,^oC$ in a closed vessel. The total pressure at equilibrium was $20\,atm$ . The $K_C$ for the reaction is
$H_2C = CH - CH_2 - I \xrightarrow[CC{{l}_{4}}]{HI(excess)}$
$n = 3, l = 1, m_l = 0$