JEE Mains · Chemistry · STD 12 - 4. d and f- block elements
500 mL of 1.2 M KI solution is mixed with 500 mL of \(0.2~M~KMnO _4\) solution in basic medium. The liberated iodine was titrated with standard \(0.1~M~Na _2 S_2 O _3\) solution in the presence of starch indicator till the blue color disappeared. The volume (in L ) of \(Na _2 S_2 O _3\) consumed is __________. (Nearest integer)
- A 1
- B 2
- C 3
- D 4
Answer & Solution
Correct Answer
(C) 3
Step-by-step Solution
Detailed explanation
\(MnO _4^{-}+ I ^{-} \rightarrow MnO _2+ I _2\) \(I _2+ S _2 O _3^{2-} \rightarrow S _4 O _6^{2-}+ I ^{-}\) gram eq of \(KMnO _4=\) gram eq of \(Na _2 S_2 O _3\) \(0.2 \times \frac{500}{1000} \times 3=0.1 \times V \times 1\) \(V =3 L\)
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