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Completion of diazotisation can be checked with

(a) Starch paper
(b) Starch KI paper
(c) Litmus paper
(d) $K_2Cr_2O_7$ paper
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Answer: Starch KI paper
 
Completion of diazotisation can be checked with starch KI paper. Excess of $HNO_2$ in the reaction mixture oxidises KI to $I_2$ which turns starch blue.
answered Feb 1, 2014 by mosymeow_1
 

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