Analytical ChemistryHard

Question

Colourless salt (A) + dil. H2SO4 or CH3COOH + Kl → blue colour with starch. (A) can be

Options

A.K2SO3
B.Na2CO3
C.NH4NO2
D.NH4Cl

Solution

2NO2- + 3I- + 4CH3COOH →  I3- + 2NO ↑ + 4CH3COO- + 2H2O.
I3- + starch → blue colouration.

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