D-And F-Block Elements Ques 121
Question: Excess of KI reacts with $ CuSO_4 $ solution and then $ Na_2S_2O_3 $ solution is added to it. Which of the statements is incorrect for this reaction
[AIEEE 2004]
Options:
A) $ Na_2S_2O_3 $ is oxidised
B) $ CuI_2 $ is formed
C) $ Cu_2I_2 $ is formed
D) Evolved $ I_2 $ is reduced
Show Answer
Answer:
Correct Answer: B
Solution:
$ 2\overset{-1}{\mathop{KI}},+2CuSO_4\to {{\overset{O}{\mathop{I}},}_2}+Cu_2I_2+2K_2SO_4 $ $ {{\overset{O}{\mathop{I}},}_2}+2Na_2\overset{+2}{\mathop{S_2}},O_3\to \overset{+2.5}{\mathop{Na_2}},S_4O_6+\overset{,-1}{\mathop{2NaI}}, $
