Question

Thiosulphate reacts differently with iodine and bromine in the reactions given below.
$2S_2O_3^{2-} + I_2 \rightarrow S_4O_6^{2-} + 2I^-$
$S_2O_3^{2-} + 2Br_2 + 5H_2O \rightarrow 2SO_4^{2-} + 2Br^- + 10H^+$
Which of the following statements justifies the above dual behaviour of thiosulphate?
(a) Bromine is a stronger oxidant than iodine
(b) Bromine is a weaker oxidant than iodine
(c) Thiosulphate undergoes oxidation by bromine and reduction by iodine in these reactions
(d) Bromine undergoes oxidation and iodine undergoes reduction in these reactions

Answer 1

Answer is (a) Bromine is a stronger oxidant than iodine.

Reason- The size of iodine is larger and Bromine is smaller. Hence it is easier for Bromine to pull an electron and oxidise a substance which makes it a better oxidant than iodine.

Answer 2

Hello Friend

ans

Option.A

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