In which of the following reactions, the underlined substance has been oxidised? a. \( \underlin...

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In which of the following reactions, the underlined substance has been oxidised?
a. \( \underline {{Br}_{2}}+\mathrm{H}_{2} \mathrm{~S} \rightarrow 2 \mathrm{HBr}+\mathrm{S} \)
b. math xmlns=http://www.w3.org/1998/Math/MathMLmundermrowmn2/mnmiH/mimig/mimiC/mimsubmil/mimn2/mn/msub/mrowmrowmo-/momo-/momo-/momo-/momo-/mo/mrow/mundermo+/momiS/mimin/mimiC/mimsubmil/mimn2/mn/msubmo→/momiH/mimsubmig/mimn2/mn/msubmiC/mimsubmil/mimn2/mn/msubmo+/momiS/mimin/mimiC/mimsubmil/mimn4/mn/msub/math
c. \( \mathrm{Cl}_{2}+\underline{2 \mathrm{KI}} \rightarrow 2 \mathrm{KCl}+\mathrm{I}_{2} \)
d. \( \underline{2 \mathrm{Cu}^{2+}}+4 \mathrm{I}^{-} \rightarrow \mathrm{Cu}_{2} \mathrm{I}_{2}+\mathrm{I}_{2} \)
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