MCQ
In the process $BC{l_3} + P{H_3} \to BC{l_3}:P{H_3}$ The Lewis acid is
- A$BC{l_3}$
- ✓$P{H_3}$
- CBoth
- DNone
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$SO{{_{3}^{2-}}_{\left( aq. \right)}}+{{H}_{2}}{{O}_{\left( l \right)}}\to SO{{_{4}^{2-}}_{\left( aq. \right)}}+2{{H}^{+}}_{\left( aq. \right)}+2{{H}^{+}}_{\left( aq. \right)}+2{{e}^{-}}$
If the oxidation number of metal in the salt was $+3$, what would be the new oxidation number of metal?