JEE Advance - Chemistry (2014 - Paper 1 Offline - No. 17)
Consider the following list of reagents, acidified K2Cr2O7, alkaline KMnO4, CuSO4, H2O2, Cl2, O3, FeCl3, HNO3 and Na2S2O3. The total number of reagents that can oxidise aqueous iodide to iodine is
Answer
7
Explanation
Acidified K2Cr2O7, CuSO4, H2O2, Cl2, O3, FeCl3 and HNO3 oxidise aq. iodide to iodine. Alkaline KMnO4 oxidise aq. iodide to IO$$_3^ - $$.
Na2S2O3 is a strong reducing agent which on reaction with I2 produces I$$-$$.
Na2S2O3 + I2 $$\to$$ 2I$$-$$ + Na2S4O6
Therefore, no reaction takes place between Na2S2O3 and iodide ion. Hence, correct integer is (7).
Na2S2O3 is a strong reducing agent which on reaction with I2 produces I$$-$$.
Na2S2O3 + I2 $$\to$$ 2I$$-$$ + Na2S4O6
Therefore, no reaction takes place between Na2S2O3 and iodide ion. Hence, correct integer is (7).
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