Analytical ChemistryHard
Question
Solution of a salt in dilute H2SO4 or acetic acid produces deep blue colour with starch iodide solution. The salt contains :
Options
A.Br-
B.I-
C.NO3-
D.NO2-
Solution
Nitrite ion liberates I2 from potassium iodide turning starch blue.
2NO2- + 3I- + 4CH3COOH → I3- + 2NO ↑ + 4CH3COO- + 2H2O
I2 + starch → blue colour
2NO2- + 3I- + 4CH3COOH → I3- + 2NO ↑ + 4CH3COO- + 2H2O
I2 + starch → blue colour
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